PRESSURE CONTROL AND MONITORING - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General
The (Cabin) Pressure Control and monitoring System (CPCS) makes sure that the pressure in the pressurized fuselage is safe and comfortable for the passengers and crew. The Cabin Pressure Controllers (CPC) control fully automatically the quantity of air that flows out of the fuselage through an outflow valve. A manual system controls the CPCS if the automatic system is not active. Two safety valves are installed in the aft pressure bulkhead which prevent that the pressure in the fuselage gets too high or too low.

** ON A/C NOT FOR ALL

2. Component Location

Pressure Control System - Component Location ** ON A/C NOT FOR ALL

FIN	FUNCTIONAL DESIGNATION	PANEL	ZONE	ATA REF
** ON A/C ALL
6HL	SAFETY VALVE		262	21-31-52
7HL	SAFETY VALVE		262	21-31-52
** ON A/C NOT FOR ALL
10HL	OUTFLOW VALVE	162DW	172	21-31-51
** ON A/C NOT FOR ALL
10HL	OUTFLOW VALVE		172	21-31-51
** ON A/C ALL
11HL	PRESS CONT 1	95VU	121	21-31-34
** ON A/C ALL
11HL	PRESS CONT 1	95VU	121	21-31-34
** ON A/C NOT FOR ALL
12HL	PRESS CONT 2	96VU	122	21-31-34
** ON A/C NOT FOR ALL
12HL	PRESS CONT 2	95VU	122	21-31-34
** ON A/C NOT FOR ALL
12HL	PRESS CONT 2	96VU	122	21-31-34
** ON A/C ALL
20HL	LDG FIELD SELECTOR	25VU	210	21-31-15

** ON A/C NOT FOR ALL

3. System Description

Pressure Control System - Component Location ** ON A/C NOT FOR ALL

A. The Pressure Control and Monitoring System
The system has two identical, independent, automatic systems. Each system has a Cabin Pressure Controller (CPC) 11HL (12HL) which controls the pressure through a flap-type outflow valve 10HL. This valve is installed in the lower right-hand fuselage skin behind the aft cargo compartment. In the automatic operation the CPCs use the data from the Flight Management and Guidance System (FMGS) and the Air Inertial/Reference System (ADIRS). The active CPC sends control signals through a RS422 bus to the outflow valve.
The electronic box, the auto-motor and a gearbox operate the outflow valve flap in the commanded position. The feedback module gives the position signals to the CPCs via the electronic box for control purposes and indication on the Electronic Instrumentation System (EIS).

Only one CPC operates its system at a time, with the other system on standby. The change of control from one CPC to the other is fully automatic after each flight, on landing with a time delay of 70 sec. The systems will also change if there is a failure or part failure of one of the control systems.
A landing field elevation (LDG ELEV) selector 20HL is installed on the CABIN PRESS overhead panel 25VU. Under normal condition the LDG ELEV selector is selected in the AUTO position. Then the CPCs 11HL (12HL) use the landing field elevation data from the FMGS.
In all other cases the LDG ELEV selector signal overrides the FMGS data (semi-automatic operation).

The MAN V/S toggle switch 5HL controls the manual motor of the outflow valve 10HL when the MAN SEL pushbutton switch 14HL is selected to MAN. These controls are installed in the cockpit, on the CABIN PRESS overhead panel 25VU.

NOTE: The MAN mode can be selected more than two times in a single flight. After each re-selection of AUTO-mode the CPC, which was previously in in standby state changes to operational state.

In manual mode the backup channel of the CPC in position No. 1 is used. It has a pressure sensor to generate the excess cabin altitude warning and pressure outputs for the indication on the EIS.

A DITCHING pushbutton switch 13HL (guarded black) closes the outflow valve in ditching configuration.

Two safety valves 6HL (7HL) prevent excessive positive and negative differential pressure in the cabin. These valves are installed in the aft pressure-bulkhead above the aircraft flotation line.
A landing field elevation (LDG ELEV) selector 20HL is installed on the CABIN PRESS overhead panel 25VU. Under normal condition the LDG ELEV selector is selected in the AUTO position. Then the CPCs 11HL (12HL) use the landing field elevation data from the FMGS.
In all other cases the LDG ELEV selector signal overrides the FMGS data (semi-automatic operation).

The MAN V/S toggle switch 5HL controls the manual motor of the outflow valve 10HL when the MAN SEL pushbutton switch 14HL is selected to MAN. These controls are installed in the cockpit, on the CABIN PRESS overhead panel 25VU.

NOTE: The MAN mode can be selected more than two times in a single flight. After each re-selection of AUTO-mode the CPC, which was previously in in standby state changes to operational state.

There is a failure in the two automatic control parts of the CPCS
The CPCS is set to the manual mode.

The RPCU opens the outflow valve automatically after landing if:

The outflow valve is not fully open
The CPCS is in manual mode or there is a failure of the two CPCs
The crew did not open the outflow valve in the manual mode.

The RPCU is installed in the right-hand side of the avionics compartment.
It uses the external relay 21HL to supply power directly to the manual motor of the outflow valve.

B. Pressure Schedules
The pressure schedules work with a dedicated rate limit to guarantee passenger comfort and safety at each flight phase. The control modes generate the operational phases for the cabin pressure schedules.

(1) Control Mode Logic

Mode Logic Switching

Mode Logic Table

The system operates with the following control modes:
GN - Ground,
TO - Take-off,
AB - Abort,
CI - Climb,
CR - Cruise,
DI - Descent,

(2) Mode Logic

(a) Function

System Operation Logic

The function of the mode logic is to determine the actual system mode using the various inputs.

(b) Switching Conditions

Mode Logic Table

The logic will switch to a specific mode depending on the condition of the aircraft.

Mode Logic Switching

Different mode logic switchings are possible:

- 'A' shows the complete mode logic switching range,

- 'B' shows the mode logic switching for normal flight,

- 'C' shows the mode logic switching for a flight where due to flight

conditions (or air traffic control instructions). It is necessary

to switch back from cruise to climb (or descent to climb).

Switching from descent to cruise does not apply, because a change

of the aircraft's cruise altitude can be done completely in FMGS

in the cruise mode. If a descent is started, the cabin pressure

starts to descend. It continues to descend (even if the aircraft

descent is stopped because of a hold), until it gets to the maximum

delta-P or the landing-field elevation (whichever is the lowest

pressure).

- 'D' shows the mode logic switching to give a realistic cabin pressure,

if it is necessary to abort a takeoff or flight. It is also

possible to return from the ground mode or the abort mode to the

internal climb mode. This gives a good system performance under

any conditions.

(3) Pressure Schedules and Rate Limits

(a) Ground Mode
On ground, the CPC keeps the cabin pressure lower than the scheduled pressure to keep the outflow valve in the fully open position. This prevents the pressurization of the cabin.

(b) Take-off Mode
In the take-off mode, the CPC pressurizes the cabin before take-off. This will prevent a pressure surge in the cabin during take-off. After take-off, the CPC changes into the climb mode.

Climb Pressure Schedule

Climb

In the climb mode, the CPC controls the pressure in the cabin in relation with the changes in ambient pressure and the aircraft climb speed. In this mode, the CPC makes sure that the cabin pressure is always less than the maximum differential pressure during the aircraft climb.

(d) Cruise Mode
In the cruise mode, the CPC keeps the differential pressure which was applicable when the mode is changed into the cruise mode.
Also for low-altitude departure airports, the CPC do not pressurize the cabin until the aircraft is in the cruise. But for high-altitude departure airports, the CPC keeps the cabin pressurized for full flight cycle.

(e) Descent Mode
During aircraft descent, the CPC adjusts the cabin pressure to make the cabin pressure equal to the landing field pressure immediately before the landing. In this mode, the cabin pressure and its rate of descent are controlled in relation to the aircraft altitude and the rate limit.
In the descent mode, to prevent a pressure surge during touch down, the CPC pressurizes the cabin with a delta p of 7 mbar (0.10 psi). At touch down, the CPC releases the pressure from the cabin at a rate of -18.3 mbar/min (500 sea level feet/minute) to the landing field pressure. The outflow valve will be in the fully open position after 55 seconds. After the ground mode is set, the system changes control from one CPC to the other in 70 seconds.

(f) Abort Mode
The function of the abort mode is to prevent a change in the cabin pressure when the aircraft does not climb after a take-off. For an example, during usual operation, after take-off, the CPC changes from the take-off mode to the climb mode. If an engine failure occurs during take-off, the aircraft starts to descend. If the altitude of the aircraft is below 8000 feet or 5000 feet above the take-off field, the CPC changes into the abort mode. The cabin pressure is then kept to the value before the take-off.

** ON A/C NOT FOR ALL

4. Power Supply

Pressure Control System - Schematic ** ON A/C NOT FOR ALL

** ON A/C NOT FOR ALL

5. Interface

CPC Signal Interface

CPC Interface Inputs

CPC Interface Outputs

A. System Interfaces

(1) ADIRS - Interface

-------------------------------------------------------------------------------

Parameters/Label used by the CPC

-------------------------------------------------------------------------------

Baro Correction mbar BCD 234 745 - 1050 mbar

Ambient Static Press (Corr.) BNR 246 100 - 1100 mbar

Ambient Static Press (Uncorr.) BNR 245 100 - 1100 mbar

True Airspeed BNR 210 60 - 599 Kts

The selection of the ADIRU 1, 2 or 3 is in accordance with the subsequent matrix:

----------------------------------------------------------------------------

! Selection of ADIRU 1, 2 or 3! !

!----------------------------------------------------------------------------!

! Priority ! 1 ! 2 ! 3 !

! System 1 ! ADIRS 1 ! ADIRS 2 ! ADIRS 3 !

! System 2 ! ADIRS 2 ! ADIRS 1 ! ADIRS 3 !

----------------------------------------------------------------------------

(2) ADIRS - Interface

-------------------------------------------------------------------------------

Parameters/Label used by the CPC

-------------------------------------------------------------------------------

Baro Correction mbar BCD 234 745 - 1100 mbar

Ambient Static Press (Corr.) BNR 246 100 - 1100 mbar

Ambient Static Press (Uncorr.) BNR 245 100 - 1100 mbar

True Airspeed BNR 210 60 - 599 Kts

The selection of the ADIRU 1, 2 or 3 is in accordance with the subsequent matrix:

----------------------------------------------------------------------------

! Selection of ADIRU 1, 2 or 3! !

!----------------------------------------------------------------------------!

! Priority ! 1 ! 2 ! 3 !

! System 1 ! ADIRS 1 ! ADIRS 2 ! ADIRS 3 !

! System 2 ! ADIRS 2 ! ADIRS 1 ! ADIRS 3 !

----------------------------------------------------------------------------

B. FMGS - Interface
The information from the FMGS is used to perform normal cabin pressure control. The CPCs use the FMGS parameters as follows:

- Destination QNH BCD 140 745 -1050 mbar

- Landing Elev. BNR 256 - 2048 to 16384ft

The information from the FMGS is used to perform normal cabin pressure control. The CPCs use the FMGS parameters as follows:

- Destination QNH BCD 140 745 -1050 mbar

- Landing Elev. BNR 256 - 2048 to 16384ft

(1) FMGS-Parameter Application

(a) Landing Altitude (Label 256)
The landing altitude (destination input) is used to calculate the general descent control schedule of the cabin pressure control system. The landing altitude is also that altitude where, after flight and depressurisation the delta-P is zero.

(b) Destination QNH (Label 140)
The CPCS uses this input for calculating the actual pressure at the landing field from the LFE input. In case that the QNH is not available, the CPC uses the baro correction from the ADIRS. If the baro correction from the ADIRS is also not available, the correction is set to the default value of 1013.25 mbar.

C. LGCIU Interface
The LGCIU 1 (5GA1) and LGCIU 2 (5GA2) give a discrete signal for the flight/ground status to the CPCs. This signal is used to switch the CPC modes.

D. EIU Interface
The EIU 1 (1KS1) and EIU 2 (1KS2) give a discrete signal for the throttle lever position to the CPCs. This signal is also used to switch the CPC modes.

E. CFDS Interface
The BITE in the CPCs and the outflow valve actuator drive electronics, can isolate faults down to component level. This information is given to the CFDIU (1TW) via an ARINC 429 data bus.

F. Explanations to the Parameter List
The parameter list is organized according to the connected ARINC 429 data buses.
The connected systems (e.g. FAC, ECU, EEC, etc.) and the corresponding ATA chapter numbers are stated in the header on the left side of each page of the parameter lists.
The columns are described as follows:

----------------------------------------------------------------

Column ! Description

----------------!-----------------------------------------------

1st ! EQ.SYS.LAB.SDI = Parameternumber

SYS.LAB.SDI !

! System number: According to the system which is

! sending out the corresponding parameter:

! 1 for system one

! 2 for system two

! 3 for system three

! Label of the parameter, octal value

! according to ARINC 429.

! SDI states the Source/Destination Identifier

! which is used by the system for the

! corresponding parameter:

! 00 means SDI 00 (0)

! 01 means SDI 01 (1)

! 10 means SDI 10 (2)

! 11 means SDI 11 (3)

---------------!------------------------------------------------

2nd ! PARAMETER

PARAMETER ! Parameter name

---------------!------------------------------------------------

3rd ! RANGE

RANGE !

! Three different types of ranges are shown in

! this column:

! The first one, indicated by a 'W' (WORDRANGE),

! is related to the ARINC 429 data bus. This

! shows the maximum value of the parameter that

! can be transferred on the bus. This

! depends on the number of data bits (see

! column DATA BITS) and the resolution ('R') of

! the parameter (see column ACCURACY).

! The second one, with no specific indication,

! shows the normal operational range of the

! parameter.

! The third one is related to the ARINC 429

! Discrete Data Words. There are two states:

! 'bit status 0' or 'bit status 1'. They

! indicate the true condition of the

! corresponding data word bit position.

---------------!----------------------------------------

4th ! ACCURACY

ACCURACY ! Two different types of values are shown

! in this column:

! The first one, indicated by an 'R'

! (RESOLUTION) is related to the ARINC

! 429 data bus. It also shows the

! resolution of the data word. The second

! one, with no specific indication, shows

! the total accuracy of the parameter.

---------------!-----------------------------------------

5th ! SIGN BIT

SIGN BIT !

! This column shows whether a sign bit

! is available and in which bit position

! of the data word it is situated.

---------------!-----------------------------------------

6th ! DATA BITS

DATA BITS !

! Describes the number of data bits not

! including the sign bit. 'A' and a number

! means the discrete bit position in the

! ARINC 429 data word.

! For BCD coded data words the number of

! significant data digits is shown,

! indicated by '(1)'.

---------------!----------------------------------------------

7th ! UPD/sec

UPD/sec !

! This column shows how many times the

! parameter will be transmitted by the source

! system per second.

---------------!----------------------------------------------

8th ! CODE

CODE !

! BNR = binary data word

! BCD = binary coded decimal data word

! ISO = data word coded in ISO 5 Code

! DIS = discrete data word

! HEX = hexadecimal coded

! OCT = octal coded

! HYB = mixed code;

! e.g. : bit 11 to 16 DIS

! bit 17 to 28 BNR

---------------!----------------------------------------------

9th ! ALPHA CODING

ALPHA CODING !

! This column shows the mnemonic for the

! parameter (if available). By entering

! this code via the MCDU, the current

! parameter-value will be shown on the

! display. The value from both systems

! (if available) will be shown.

---------------!----------------------------------------------

10th ! This column shows the source origin, its

Source ! bus number, ATA Ref., and its label.

EQPT !

BUS NR !

ATA. REF !

CONV !

---------------!----------------------------------------------

G. Pressurization Control Parameter List EQPT: 5C

-------------------------------------------------------------------------------

| PARAMETER LIST PARAMETER CHARACTERISTICS (NUMERIC) |

-------------------------------------------------------------------------------

-------------------------------------------------------------------------------

!1.057.01 !STATUS + ! ! ! ! ! ! ! ! !

!2.057.10 !FAULT INFO! ! ! ! 10 ! 4 !DIS !PCSW ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !SYSTEM IN ! ! ! ! ! ! ! ! !

! !CONTROL !bit status 1! ! !A 11! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !SYSTEM ! ! ! ! ! ! ! ! !

! !STATUS - ! ! ! ! ! ! ! ! !

! !FAIL !bit status 1! ! !A 12! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !FMS LFE - ! ! ! ! ! ! ! ! !

! !NOT USED !bit status 1! ! !A 13! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !EXCESSIVE ! ! ! ! ! ! ! ! !

! !CABIN ! ! ! ! ! ! ! ! !

! !ALTITUDE- ! ! ! ! ! ! ! ! !

! !WARN !bit status 1! ! !A 14! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !LOW DIF- ! ! ! ! ! ! ! ! !

! !FERENTIAL ! ! ! ! ! ! ! ! !

! !PRESSURE- ! ! ! ! ! ! ! ! !

! !WARN !bit status 1! ! !A 15! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !PREPLANNED! ! ! ! ! ! ! ! !

! !DESC INF- ! ! ! ! ! ! ! ! !

! !TOO QUICK !bit status 1! ! !A 16! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !LDG FLD ! ! ! ! ! ! ! ! !

! !ELEV SEL ! ! ! ! ! ! ! ! !

! !STAT - ! ! ! ! ! ! ! ! !

! !MANUAL !bit status 1! ! !A 17! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !USED ADIRS! ! ! ! ! ! ! ! !

! !CHAN BIT 1! ! ! !A 18! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !USED ADIRS! ! ! ! ! ! ! ! !

! !CHAN BIT 2! ! ! !A 19! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !FMS !bit status 1! ! ! ! ! ! ! !

! !ENABLED ! ! ! !A 20! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !FLIGHT ! ! ! ! ! ! ! ! !

! !MODE, BIT1! ! ! !A 21! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !FLIGHT ! ! ! ! ! ! ! ! !

! !MODE, BIT2! ! ! !A 22! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !FLIGHT ! ! ! ! ! ! ! ! !

! !MODE, BIT3! ! ! !A 23! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !FMS SELECT! ! ! ! ! ! ! ! !

! !BIT 1 ! ! ! !A 24! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !FMS SELECT! ! ! ! ! ! ! ! !

! !BIT 2 ! ! ! !A 25! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !FMS 1 & 2 ! ! ! ! ! ! ! ! !

! ! NOT USED !bit status 1! ! !A 26! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !QNH FROM ! ! ! ! ! ! ! ! !

! !FMS ! ! ! ! ! ! ! ! !

! !NOT USED !bit status 1! ! !A 27! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !SPARE ! ! ! !A 28! ! ! ! !

! !----------!------------!----!----!----!----!----!-----!-------!

! !SPARE ! ! ! !A 29! ! ! ! !

!--------------!----------!------------!----!----!----!----!----!-----!-------!

!1.144.01 !CABIN DIFF!W +/- 32 !PSI ! ! ! ! ! ! !

!2.144.10 !PRESS !-6 to 12 !PSI ! ! ! ! ! ! !

! ! !R 0.00195 !PSI ! ! ! ! ! ! !

! ! !+/- 0.075 !PSI ! 29 ! 14 ! 8 !BNR !PDC ! !

!--------------!----------!------------!----!----!----!----!----!-----!-------!

!1.150.01 !CABIN V/S !W +/- 6400 !ft/ ! ! ! ! ! ! !

!2.150.10 ! !-6400 to !min ! ! ! ! ! ! !

! ! !6400 ! ! ! ! ! ! ! !

! ! !R 50 !ft/ ! ! ! ! ! ! !

! ! !+/- 50 !min ! 29 ! 7 ! 1 !BNR !VSCB ! !

!--------------!----------!------------!----!----!----!----!----!-----!-------!

!1.151.01 !CABIN !W +/- 32768 ! ft ! ! ! ! ! ! !

!2.151.10 !ALTITUDE !-15000 to ! ft ! ! ! ! ! ! !

! ! !30000 ! ft ! ! ! ! ! ! !

! ! !R 16 ! ft ! ! ! ! ! ! !

! ! !+/- 32 ! ft ! 29 ! 11 ! 4 !BNR !ZCB ! !

!--------------!----------!------------!----!----!----!----!----!-----!-------!

!1.153.01 !OUTFLOW !W 128 ! % ! ! ! ! ! ! !

!2.153.10 !VALVE POS.!0 to 100 ! % ! ! ! ! ! ! !

! ! !R 1 ! % ! ! ! ! ! ! !

! ! !+/- 3 ! % ! ! 7 ! 2 !BNR !OVP ! !

!--------------!----------!------------!----!----!----!----!----!-----!-------!

!1.163.01 !LANDING !W +/- 32768 ! ft ! ! ! ! ! ! !

!2.163.10 !ELEVATION !-2000 to ! ft ! ! ! ! ! ! !

! ! !14000 ! ft ! ! ! ! ! ! !

! ! !R 32 ! ft ! ! ! ! ! ! !

! ! !+/- 50 ! ft ! 29 ! 10 ! 2 !BNR !ZLD ! !

!--------------!----------!------------!----!----!----!----!----!-----!-------!

!1.356.01 !MAINTENAN-! ! ! ! ! ! ! ! !

!2.356.10 !CE MESSAGE! ! ! ! ! ! ! ! !

! !WORD 1 ! ! ! ! ! !ISO ! ! !

!--------------!----------!------------!----!----!----!----!----!-----!-------!

Pressurization Control Parameter List Remarks:

R = Resolution

W = Wordrange

(I)= Significant Data Digits

H. Alpha Call-up List.

----------------------------------------------------------------------------

! ALPHA ! PARAMETER ! NAME !

! CALL UP ! NUMBER ! !

!---------+-------------+----------------------------------------------------!

! PCSW ! 5C.1.057.01! Status + Fault Info. !

! ! 5C.2.057.10! !

! ! ! !

! PDC ! 5C.1.144.01! Cabin Diff. Press PSI !

! ! 5C.2.144.10! !

! ! ! !

! VSCB ! 5C.1.150.01! Cabin V/S ft/min!

! ! 5C.2.150.10! !

! ! ! !

! ZCB ! 5C.1.151.01! Cabin Altitude ft !

! ! 5C.2.151.10! !

! ! ! !

! OVP ! 5C.1.153.01! Outflow Valve Pos. % !

! ! 5C.2.153.10! !

! ! ! !

! ZLD ! 5C.1.163.01! Landing Elevation ft !

! ! 5C.2.163.10! !

----------------------------------------------------------------------------

** ON A/C NOT FOR ALL

6. Component Description

A. Cabin Pressure Controller (CPC) FIN: 11-HL FIN: 12-HL

CPC - Block Diagram

The CPCs 11HL (12HL) have functions as follows:

automatic cabin pressure control,
back-up indication for manual control,
alarm functions (ECAM warnings),
self-monitoring and failure indication (BITE + CFDS).

Two identical CPC are used for redundant system control, each contains:

a cabin pressure sensor,
the ARINC bus interface to SDAC (ECAM), CFDS, FMGS and ADIRS,
the discrete interface to the LGCIU and EIU,
the digital control logic,
the interface with the landing-field elevation selector,
the interface with the other CPC,
the interface with the outflow valve 10HL actuator.

A separate electrically supplied part of the CPC in Position 1 is the back-up circuit and it contains:

a pressure sensor,
an analog circuit.

These generate the limit function output discrete and the analog system display outputs.
The controllers are housed in a standard 2 MCU (Ref. ARINC 600), and are installed in the shelves 95VU and 96VU of the main rack 90VU.
The CPC receives signals from different sources. All signals sent are digital or discrete. The CPC back-up indication circuit sends only analog signals to the EIS.

(1) Cabin Pressure Sensor

CPC Pressure Sensor ** ON A/C NOT FOR ALL

The cabin pressure sensor within the CPC 11HL (12HL) is of a vibrating cylinder type. The principle is that a physical body vibrates at its natural frequency with high stability under constant environmental conditions. The frequency of oscillation of this system is a function of materials and shape of the cylinder. The frequency depends on the environment, specifically temperature and pressure surrounding the cylinder. Therefore, the frequency can be used as a reference value of the pressure.

(2) Cabin Pressure Sensor
The cabin pressure sensor within the CPC 11HL (12HL) bases on a piezo resistive sensing element (Wheatstone bridge). In order to allow temperature compensation the pressure is calculated with the signal of a temperature sensor.

(3) Residual Pressure Control Unit (RPCU)
The RPCU is an electronic box with 2 connectors for the electrical interface connection. The RPCU is not attached to a rack and has no local controls or indicators.
The RPCU is permanently connected to the 28VDC essential bus 301PP and has a discrete 28VDC output for the power supply of the manual motor of the outflow valve.

B. Outflow Valve

NOTE: This description is only applicable for Outflow Valve Part Numbers 9023-15703-81 and previous.

Outflow Valve

Actuator Geartrain - Schematic

The outflow valve 10HL is of a motor driven type. The valve body assembly is cast from aluminum alloy. The outflow valve has:

two outflow valve electronic boxes,
two automatic motors,
a manual motor,
a feedback module,
an outflow valve body and,
a gearbox.

Only one motor is active at any one time. During this time the other motors are locked.

(1) Outflow Valve Electronic Boxes
The outflow-valve electronic boxes contain the electronic circuits which are devided into the following sections:

the data input section (RS422 receiver),
the microcontroller and memory section,
the motor drive section,
the valve position feedback section (RVT position),
the BITE circuits,
the data output section (RS422 transmitter),
the power supply module.

The box communicates with the CPC 11HL respectively 12HL via the RS422 bus.
A pressure switch is installed in each box. It operates independently from the automatic operation. It closes the outflow valve if the pressure in the fuselage is less than the atmospheric pressure at an altitude of 15000 ft. (4571.92 m).

(2) Automatic Motors
The automatic motors are of a DC brushless type with an electromechanical brake. They are used in the automatic operation mode.

(3) Manual Motor
The manual motor is a DC brush type. It is used in the manual operation mode.

(4) Feedback Module
The feedback module is a Rotary Variable Transformer (RVT). It sends position data to the cabin pressure controllers 11HL and 12HL through the outflow valve electronic boxes. A potentiometer sends position data to the manual backup circuit of the cabin pressure controller 11HL.

(5) Outflow Valve Bodies
The outflow valve body has two gates, one forward and one aft. The gates are installed in a rectangular frame. The forward gate opens outwards and is mechanically connected to the aft gate. The aft gate opens inwards and is mechanically connected to the gear box and the forward gate. At low valve angles the valve gates make a two-dimensional nozzle that directs the outflow of air and gives thrust recovery.

(6) Gearbox
The gearbox transmits the movement from the activated motor to the outflow valve flap. A mechanical stop limits the rotation of the drive shaft for the valve flap movement.

C. Outflow Valve

NOTE: This description is only applicable for Outflow Valve Part Number 20790-01AA.

Outflow Valve

Actuator Geartrain - Schematic

The outflow valve 10HL is of motor driven type. The valve body assembly is milled from aluminum alloy. The outflow valve has:

two outflow valve electronic boxes,
two automatic motors,
a manual motor,
an outflow valve body and,
a gearbox and feedback assembly.

Only one motor is active at any one time. During this time the other motors are locked.

(1) Outflow Valve Electronic Boxes
The outflow-valve electronic boxes contain the electronic circuits which are devided into the following sections:

the data input section (RS422 receiver),
the microcontroller and memory section,
the motor drive section,
the valve position feedback section,
the BITE circuits,
the data output section (RS422 transmitter),
the power supply module.

(2) Automatic Motors
The automatic motors are of a DC brushless type with an electro-mechanical brake. They are used in the automatic operation mode.

(3) Manual Motor
The manual motor is a DC brush type. It is used in the manual operation mode.

(4) Outflow Valve Bodies
The outflow valve body has two gates, one forward and one aft. The gates are installed in a rectangular frame. The forward gate opens outwards and is mechanically connected to the aft gate. The aft gate opens inwards and is mechanically connected to the gear box and the forward gate. At low valve angles the valve gates make a two-dimensional nozzle that directs the outflow of air and gives thrust recovery.

(5) Gearbox and Feedback Assembly
The gearbox transmits the movement from the activated motor to the outflow valve flap. A mechanical stop limits the rotation of the drive shaft for the valve flap movement.
The feedback module is a triple potentiometer integrated with the gearbox. It sends data to the cabin pressure controllers 11HL and 12HL through the outflow valve electronic boxes. The data is used for:

indication and initialization purposes when in the automatic mode or,
indication purposes when in the manual backup mode.

D. Protection Creel
To prevent foreign objects entering the pressurized fuselage a metal grill is installed to brackets on the aircraft internal structure and completely covers the outflow valve.

E. Safety Valves

Safety Valve ** ON A/C NOT FOR ALL

Cabin Pressure/Altitude Envelope ** ON A/C NOT FOR ALL

The safety valves 6HL (7HL) are poppet-type pneumatic valves. They have a valve part and a control part in a housing. The valve part has a cap with a filter, a diaphragm, a pedestal and a bellmouth. The control part has a position switch, a negative delta-P check-valve and a controller. The position switch is connected electrically to the System Data Aquisition Concentrators (SDACs). The negative delta-P check-valve opens if the external pressure is higher than the internal pressure. The controller has a diaphragm, a poppet and springs to preload the poppet. The poppet gives accurate limit control. If the internal pressure is more than the design goal of 8.6 psi (0.5929 bar) above the external pressure, the poppet moves and air flows out of the fuselage. For negative delta-P condition it is ensured by a minimum of one safety valve operating, that the internal pressure is not more than 0.175 psi (0.0121 bar) below the external pressure.

Safety Valve ** ON A/C NOT FOR ALL

Cabin Pressure/Altitude Envelope ** ON A/C NOT FOR ALL

The safety valves 6HL (7HL) are poppet-type pneumatic valves. Each valve has:

A valve assembly
A pneumatic controller assembly
A position switch
A safety valve filter

(1) Valve Assembly
The valve assembly has an aluminum housing with a spring loaded diaphragm, a gate and a deflector with a built-in check valve. The chambers (the cabin chamber and the servo chamber) at the two sides of the diaphragm have access to the cabin pressure through the holes. The valve assembly is installed on a pedestal in the aft pressure bulkhead.

(2) Pneumatic Controller Assembly
The pneumatic controller assembly has a metal capsule which can expand and a stem assembly with a needle which gives accurate pressure limit control. The inner side of the capsule has the cabin pressure. An ambient pressure sense-line supplies aircraft ambient pressure to the other side of the capsule. The functions of the pneumatic controller assembly are as follows:

(a) Overpressure Relief
If the internal (cabin) pressure in the metal capsule is more than the applicable value, the capsule expands and moves the needle of the stem assembly. This opens an air bypass and a small quantity of air from the servo chamber side of the main valve diaphragm flows overboard. This causes a differential pressure at the main diaphragm which opens the gate of the safety valve. The air flows overboard and this releases the pressure in the cabin which is more than the applicable value.
The safety valves open at a differential pressure of 8.6 psi (0.5929 bar).

(b) Negative Pressure Relief
If the ambient pressure is more than the cabin pressure, the negative delta-p check-valve in the deflector of the safety valve opens. The ambient air flows into the cabin chamber side of the main valve diaphragm. This causes a differential pressure at the main diaphragm which opens the gate of the safety valve. The air flows into the cabin until the cabin pressure is the same as the ambient pressure.
The safety valves open at a negative differential pressure of 0.175 psi (0.0121 bar).

(3) Position Switch
Each safety valve has a microswitch which sends a signal to the System Data Aquisition Concentrators (SDACs) if the valve is open.

** ON A/C NOT FOR ALL

7. Operation/Control and Indicating

Pressure Control System - Component Location ** ON A/C NOT FOR ALL

Pressure Control System - Block Diagram

A. Automatic Operation
No action of the crew is necessary. The CPCs receive landing elevation and QNH data from the FMGC and pressure altitude data from the ADIRUs. Only one CPC operates at a time, the other CPC is in standby.
The active CPC sends demand signals to the electronic box of the outflow valve. The related auto-motor controls the outflow valve flap through a gearbox to the demanded position. The feedback module sends the position data through the electronic box to the CPC. On the PRESS page of the ECAM lower display unit the system status is shown.
70 seconds after each aircraft landing the active CPC changes to standby and the standby CPC changes to active.

The CPCs pressurize the aircraft through 6 modes.

(1) Ground Mode (GN)
Before take-off and 55 seconds after landing, the active CPC controls the outflow valve to the fully open position to make sure that there is no residual delta-P in the aircraft.
At touchdown, the CPCs controls the cabin V/S at -500 ft/mn. to release the remaining delta pressure.

(2) Take-off Mode (TO)
The active CPC pressurizes the aircraft with a rate of -400 ft/mn. until the delta pressure reaches 0.1 psi.

(3) Climb Mode (CE)
The active CPC controls the pressure in relation to the actual rate of climb of the aircraft.

(4) Cruise Mode (CR)
The cabin altitude is controlled to a constant delta-P.

(5) Desent Mode (DE)
The active CPC optimizes the pressure rate so that the cabin pressure reaches the landing field pressure just prior to landing. The maximum desent rate is limited to -750 ft/mn.

(6) Abort Mode (AB)
The active CPC uses the abort mode to prevent the cabin altitude from climbing if the aircraft does not climb after take-off. The cabin pressure is controlled to the value before the take-off.

B. Semi-Automatic Operation
If the FMGS data is not available, the CPCs use the barometric correction from the ADIRS and the landing elevation from the LDG ELEV selector switch in the cockpit to control the auto-motor of the outflow valve.

C. Manual Operation
The cabin pressure can be controlled manually from the CABIN PRESS overhead panel 25VU. When the MODE SEL pushbutton switch is released to the MAN position and the MAN V/S CTL switch is set to UP or DN, the manual motor and the gearbox moves the outflow valve flaps to the commanded position. The feedback module sends position signals to the backup part of the CPC 1 for indication.
The backup part gives the excess cabin altitude and the pressure data to the EIS. The data is shown on the PRESS page of the ECAM lower display unit.

D. Operation if there is a Failure

(1) Failure in the active CPCS
If the Built-In Test Equipment (BITE) detects a failure, the status changes automatically to standby and the other system takes over the control. Minor failures which are stored in the class 3 memory, do not lead to a system failure.
The CPC sends a signal to the EIS and on the ECAM upper display unit the related warning appears. The CPC also keeps the failure data in its memory which can be indicated on the MCDU.

(2) Failure in the standby CPCS
If the BITE detects a failure, the system stays in standby-fail. Minor failures which are stored in the class 3 memory, do not lead to a system failure.
The CPC sends a signal to EIS and on the ECAM upper display unit the related warning appears. The CPC also keeps the failure data in its memory which can be indicated on the MCDU.

(3) Failure in both CPCS
If in both CPCS systems failures appear, the crew must control the cabin pressure manually.
The CPCs send a signal to EIS and on the ECAM upper display unit the related warning appears. The CPCs also keep the failure data in its memory which can be indicated on the MCDU.

(4) Failure in the active CPCS
If the Built-In Test Equipment (BITE) detects a failure, the status changes automatically to standby and the other system takes over the control. Minor failures which are stored in the class 3 memory, do not lead to a system failure.
The CPC sends a signal to the EIS and on the ECAM upper display unit the related warning appears. The CPC also keeps the failure data in its memory which can be indicated on the MCDU.

(5) Failure in the standby CPCS
If the BITE detects a failure, the system stays in standby-fail. Minor failures which are stored in the class 3 memory, do not lead to a system failure.
The CPC sends a signal to EIS and on the ECAM upper display unit the related warning appears. The CPC also keeps the failure data in its memory which can be indicated on the MCDU.

(6) Failure in both CPCS
If in both CPCS systems failures appear, the crew must control the cabin pressure manually.
The CPCs send a signal to EIS and on the ECAM upper display unit the related warning appears. The CPCs also keep the failure data in its memory which can be indicated on the MCDU.
If the crew cannot control the cabin pressure manually, the RPCU will open the outflow valve automatically under these conditions:

The outflow valve is not fully open
Both landing gears are on ground or one landing gear is on ground and the park brake is applied
All engine master lever switches are in the OFF position or all air data units show speed below 100 knots
The two CPCs are in standby fail or on manual mode.

E. Control and Indicating

CABIN PRESS - Panel 25VU

(1) LDG ELEV Selector

AUTO and Pushed
The CPCs use the landing elevation and the QNH data from FMGS,
Pulled and Turned
The data from FMGS is not used, the crew must select the landing-field elevation manually. The control range is from -2000 to 14000ft.

(2) MODE SEL Pushbutton Switch

AUTO
The automatic mode of the active CPC operates the outflow valve and supplies data for indication on the EIS.
MAN
When the MODE SEL pushbutton switch is released (the MAN legend comes on), the manual operation is active.
FAULT
The FAULT legend comes on if both automatic systems are defective. When the pushbutton switch is released (the MAN legend comes on and the FAULT legend goes off) the manual control is then operative with the toggle switch to control outflow valve position.
For CPC P/N 20791 only:
Push and release the MAN pushbutton switch to switch the active auto system in stand-by and the stand-by auto system takes over control.

(3) V/S CTL Toggle Switch
The switch, spring loaded to neutral,controls the outflow valve with the manual motor, when the MODE SEL pushbutton switch is in the MAN position.

UP : The outflow valve move towards the open position,
DN : The outflow valve move towards the closed position.

(4) DITCHING pushbutton switch (guarded black)

Normal released Position
Normal system operation.
ON
When the pushbutton switch 13HL is pushed (the ON legend comes on) and the aircraft goes into the ditching configuration. This closes:
.the outflow valve 10HL,
.the packs flow control valves 11HB (8HB),
.the avionics skin air inlet valve 15HQ, if open,
.the avionics skin air outlet valve 22HQ, if open,
.the emergency ram-air inlet, if open,
.the fwd cargo isolation valves 4HN (5HN), if installed.

(5) MODE SEL Pushbutton Switch

AUTO
The automatic mode of the active CPC operates the outflow valve and supplies data for indication on the EIS.
MAN
When the MODE SEL pushbutton switch is released (the MAN legend comes on), the manual operation is active.
FAULT
The FAULT legend comes on if both automatic systems are defective. When the pushbutton switch is released (the MAN legend comes on and the FAULT legend goes off) the manual control is then operative with the toggle switch to control outflow valve position.
For CPC P/N 20791 only:
Push and release the MAN pushbutton switch to switch the active auto system in stand-by and the stand-by auto system takes over control.

(6) V/S CTL Toggle Switch
The switch, spring loaded to neutral,controls the outflow valve with the manual motor, when the MODE SEL pushbutton switch is in the MAN position.

UP : The outflow valve move towards the open position,
DN : The outflow valve move towards the closed position.

(7) DITCHING pushbutton switch (guarded black)

Normal released Position
Normal system operation.
ON
When the pushbutton switch 13HL is pushed (the ON legend comes on) and the aircraft goes into the ditching configuration. This closes:
.the outflow valve 10HL,
.the pack flow control valves of the flow control units 23HB (24HB),
.the avionics skin air inlet valve 15HQ, if open,
.the avionics skin air outlet valve 22HQ, if open,
.the emergency ram-air inlet, if open,
.the fwd cargo isolation valves 4HN (5HN), if installed.

F. Failure Indications

(1) Excessive Cabin Altitude
If the cabin altitude is between 9200 and 9900 ft.:

a Continuous Repetative Chime (CRC) comes on in the cockpit,
red MASTER WARN lights flashes on the glareshield panel,
on the ECAM upper display unit, the warning CAB PRESS EXCESS CAB ALT comes on.

(2) CPCS 1+2 Fault
If there is a failure in both CPCS:

a Single Chime (SC) comes on in the cockpit,
the MASTER CAUT lights appear on the glareshield panel,
on the ECAM upper display unit, the warning CAB PRESS SYS 1+2 FAULT comes on.

(3) CPCS 1(2) Fault
If there is a failure in one of the CPCS:

on the ECAM upper display unit, the warning CAB PRESS SYS 1(2) FAULT comes on.

(4) LDG ELEV Fault
If there is no landing field elevation data available from the FMGS and the LFES is selected to AUTO:

a SC comes on in the cockpit,
the MASTER CAUT lights appear on the glareshield panel,
on the ECAM upper display unit, the warning CAB PRESS LDG ELEV FAULT comes on.

(5) Outflow Valve not open
If the outflow valve is not open on the ground for more than 3 minutes:

a SC comes on in the cockpit,
the MASTER CAUT lights appear on the glareshield panel,
on the ECAM upper display unit, the warning CAB PRESS OUTFLOW VALVE NOT OPEN comes on.

(6) Safety Valve open
If the safety valves are not fully closed on the ground or not fully closed in flight for more than 1 minute:

a SC comes on in the cockpit,
the MASTER CAUT lights appear on the glareshield panel,
on the ECAM upper display unit, the warning CAB PRESS SAFETY VALVE OPEN comes on.

(7) Low Differential Pressure
If the CPC detects in the descent phase that delta-P gets zero within 1.5 minutes and more than 0.5 minutes earlier than the cabin reaches the landing field pressure and aircraft is at least 3000 ft above landing field:

a SC comes on in the cockpit,
the MASTER CAUT lights appear on the glareshield panel,
on the ECAM upper display unit, the warning CAB PRESS LOW DIFF PR comes on.

G. Cabin Altitude Indication

(1) Auto Mode
The calculation of the cabin altitude in the AUTO mode is done depending on the aircraft altitude.

if the aircraft altitude is higher than 5000 ft. above take-off or landing fields, the cabin altitude is calculated to the standard atmosphere.
if the aircraft altitude is lower than 5000 ft. above take-off or landing fields, the cabin altitude is calculated to the actual altitude above sea level (using the barometric correction from the ADIRS).

(2) Manual Mode
The calculation of the cabin altitude in the MAN mode is done in the SDACs to standard atmosphere (the CPCS manual backup circuit provides the SDAC with a cabin pressure value).
Therefore, there can be a slight difference in the cabin altitude between AUTO and MAN mode if the aircraft altitude is higher than 5000 ft. above take-off or landing fields.
There may be a difference between the cabin altitude due to the actual barometric conditions (weather) if the aircraft altitude is lower than 5000 ft. above take-off or landing fields.

(3) Altitude Indications in AUTO/MAN Mode

-------------------------------------------------------------------------

! Take-off or ! Barometric ! Cabin Altitude Indication !

! Landing Fields ! Condition ! !

! Elevation ! ! AUTO Mode ! MAN Mode !

!-----------------+-----------------+----------------+------------------!

! Sea Level ! Low Pressure ! 0 ft ! 1200 ft !

! ! 970 mbar ! ! !

! !-----------------+----------------+------------------!

! ! Standard ! 0 ft ! 0 ft !

! ! 1013 mbar ! ! !

! !-----------------+----------------+------------------!

! ! High Pressure ! 0 ft ! -700 ft !

! ! 1040 mbar ! ! !

!-----------------+-----------------+----------------+------------------!

! 500 ft ! Low Pressure ! 500 ft ! 1800 ft !

! ! 950 mbar ! ! !

! !-----------------+----------------+------------------!

! ! Standard ! 500 ft ! 500 ft !

! ! 995 mbar ! ! !

! !-----------------+----------------+------------------!

! ! High Pressure ! 500 ft ! -200 ft !

! ! 1020 mbar ! ! !

!-----------------+-----------------+----------------+------------------!

! 1000 ft ! Low Pressure ! 1000 ft ! 2300 ft !

! ! 930 mbar ! ! !

! !-----------------+----------------+------------------!

! ! Standard ! 1000 ft ! 1000 ft !

! ! 977 mbar ! ! !

! !-----------------+----------------+------------------!

! ! High Pressure ! 1000 ft ! 350 ft !

! ! 1000 mbar ! ! !

!-----------------+-----------------+----------------+------------------!

! 2000 ft ! Low Pressure ! 2000 ft ! 3250 ft !

! ! 900 mbar ! ! !

! !-----------------+----------------+------------------!

! ! Standard ! 2000 ft ! 2000 ft !

! ! 942 mbar ! ! !

! !-----------------+----------------+------------------!

! ! High Pressure ! 2000 ft ! 1200 ft !

! ! 970 mbar ! ! !

-------------------------------------------------------------------------

NOTE: The accuracy of the cabin altitude indication in the MAN mode is +/- 1100 ft.

** ON A/C NOT FOR ALL

8. BITE Test

A. CPC Power-Up Test
If the aircraft is on ground and

the engines are below minimum take-off power (CPCS in ground mode),
the CPC power-up test is done after a cold start, a reset or a power supply interrupt (> 2ms).
The duration of the power-up test is 1 second. During the power-up test:
internal devices initialize and check the hardware and the software of the CPC.
When the test has passed the PRESS page shows the normal display.
When the power-up test fails on the ECAM upper display unit, the warning CAB PR SYS 1(2) FAULT comes on.

B. CPC Reset
For the reset of the CPCs the subsequent circuit breakers must be opened for at least 2 seconds:

for the CPC 1, the circuit breaker 1HL which is installed on the circuit breaker panel 49VU,
for the CPC 2, the circuit breaker 2HL which is installed on the circuit breaker panel 122VU.

When the circuit breaker for the related CPC is closed again the CPC power-up test starts.

C. Built-In Test Equipment
The CPCs control the BITE function for the pressure control and monitoring system. They monitor the hardware and system performance and send failure data to the Centralized Fault Display System (CFDS) (Ref. AMM D/O 31-32-00-00). More information about a failure is available on the MCDU.
On the MCDU, when the CAB PRESS CONT 1(2) page is selected the subsequent menus are available:

(1) <LAST LEG REPORT

MCDU - LAST/PREVIOUS LEG REPORT and LRU IDENTIFICATION

The LAST LEG REPORT shows all failures that occured during the last leg. The MCDU screen shows:

the maintenance message of the failure,
a fault code for shop maintenance,
the date and time when the fault occurs,
the ATA number of the maintenance message,
the FIN of the failed component.

(2) <PREVIOUS LEG REPORT

MCDU - LAST/PREVIOUS LEG REPORT and LRU IDENTIFICATION

The PREVIOUS LEGS REPORT shows all failure that occured during the last 63 legs. The MCDU screen shows:

the flight number (aircraft tail number),
the maintenance message of the failure,
a fault code for shop maintenance,
the leg number,
the date and time when the fault occurs,
the flight phase,
the ATA number of the maintenance message,
the FIN of the failed component.

(3) <LRU IDENTIFICATION

MCDU - LAST/PREVIOUS LEG REPORT and LRU IDENTIFICATION

The LRU IDENTIFICATION shows the P/N of the CPCs.

(4) <TEST/CALIBRATION

MCDU - TEST/CALIBRATION

When the TEST/CALIBRATION line key is pressed, the MCDU shows:
ESC PACKS ........................OFF,
GROUND AIR SUPPLY ................OFF,
LFES .................SET TO 14000 ft,
ADIRS 1; 2; 3 .....................ON,
MODE SEL ........................AUTO,

<CONTINUE

When the CONTINUE line keyis pressed, the test starts and the message (IN PROGRESS 90 SEC) comes on. After the test, one of the subsequent is shown:

TEST OK if there are no failures,
RESET LFES ---> AUTO

TEST FAILED
the maintenance message of the failure,
a fault code for shop maintenance.

TEST FAILED
TRY C/B RESET + NEW TEST
RESET LFES ---> AUTO

NO TEST
MODE SEL AUTO + NEW TEST

(5) <CLASS 3 FAULTS

MCDU - CLASS 3 FAULTS

The CLASS 3 FAULTS show all class 3 failures. The MCDU screen shows:

the maintenance message of the failure,
a fault code for shop maintenance,
the leg number,
the date and time when the fault occurs,
the flight phase,
the ATA number of the maintenance message,
the FIN of the failed component.

D. MCDU Maintenance Messages

NOTE: The details which follow are only applicable for:

Cabin Pressure Controllers 9022-15702-9 and previous.

If there is a failure, a maintenance message is shown on the MCDU. A failure in the CPCS can be class 1 or class 3. Class 1 failures require immediate maintenance action, as they always lead to a loss of the affected system with operational consequences. A class 3 failure is not as important, but should be observed for frequent recurance.

(1) Class 1 Maintenance Messages

NOTE: (XX) = the related fault code for shop maintenance.

-------------------------------------------------------------------------------

| BITE TEST

|-----------------------------------------------------------------------------|

| INDICATION ON THE MCDU | ATA REF. | BITE DETECTION |

-------------------------------------------------------------------------------

PRESS CONTR. 1 (XX) 21-31-34 CPC 1 fault

PRESS CONTR. 2 (XX) 21-31-34 CPC 2 fault

OUTFLOW VALVE AUTO 21-31-51 OFV auto motor 1 fault

MOTOR 1 (XX)

OUTFLOW VALVE AUTO 21-31-51 OFV auto motor 2 fault

MOTOR 2 (XX)

OUTFLOW VALVE 21-31-51 OFV electronic box 1 fault

ELECTRONIC 1 (XX)

OUTFLOW VALVE 21-31-51 OFV electronic box 2 fault

ELECTRONIC 2 (XX)

OUTFLOW VALVE FEEDBACK 21-31-51 OFV feedback module fault

ASSY (XX)

(2) Class 3 Maintenance Messages

NOTE: (XX) = the related fault code for shop maintenance.

-------------------------------------------------------------------------------

| BITE TEST

|-----------------------------------------------------------------------------|

| INDICATION ON THE MCDU | ATA REF. | BITE DETECTION |

-------------------------------------------------------------------------------

LFES (XX) 21-31-00 Landing field elevation selector fault

PRESS CONTR 1 (XX) 21-31-34 CPC 1 fault

PRESS CONTR 2 (XX) 21-31-34 CPC 2 fault

OUTFLOW VALVE 21-31-15 OFV fault (mechanical)

BLOCKED (XX)

FMGS 1 OUT OF RANGE (XX) 22-83-34 CPC 1(2) receives incorrect FMGS data

FMGS 2 OUT OF RANGE (XX) 22-83-34 CPC 1(2) receives incorrect FMGS data

NO DATA FROM FMGS 1 (XX) 22-83-34 CPC 1(2) receives no data from the

FMGS 1

NO DATA FROM FMGS 2 (XX) 22-83-34 CPC 1(2) receives no data from the

FMGS 2

LGCIU SIG REPLACED (XX) 32-31-71 LGCIU signal mismatched

ADIRS 1 OUT OF RANGE (XX) 34-12-34 CPC 1(2) receives incorrect ADIRS 1

data

ADIRS 2 OUT OF RANGE (XX) 34-12-34 CPC 1(2) receives incorrect ADIRS 2

data

ADIRS 3 OUT OF RANGE (XX) 34-12-34 CPC 1(2) receives incorrect ADIRS 3

data

NO DATA FROM ADIRS 1 (XX) 34-12-34 CPC 1(2) receives no data from the

ADIRS 1

NO DATA FROM ADIRS 2 (XX) 34-12-34 CPC 1(2) receives no data from the

ADIRS 2

NO DATA FROM ADIRS 3 (XX) 34-12-34 CPC 1(2) receives no data from the

ADIRS 3

EIU SIG REPLACED (XX) 73-25-34 EIU signal mismatched

(3) Fault Codes
If a fault is detected by the CPC BITE, a fault code for shop maintenance is shown on the CFDS in addition to the related CFDS maintenace message.
The subsequent table shows the possible fault codes with their attached fault origins:

.-------.--------------------------------------.------------------------------.

! FAULT ! FAULT ORIGIN ! CFDS MESSAGE !

! CODE ! ! !

!-------!--------------------------------------!------------------------------!

! 00 ! CONTR ON CHIP RAM ! PRESS CONTR. 1 (2) !

!-------!--------------------------------------!------------------------------!

! 01 ! CONTR EXTERNAL RAM ! PRESS CONTR. 1 (2) !

!-------!--------------------------------------!------------------------------!

! 02 ! FMS 1 DATA OUT OF RANGE ! FMGS 1 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 03 ! FMS 2 DATA OUT OF RANGE ! FMGS 2 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 04 ! ACTUATOR STATUS ! OUTFLOW VALVE ELECTRONIC !

! ! ! 1 (2) !

!-------!--------------------------------------!------------------------------!

! 05 ! CALIBRATION TIME (OPEN) ! !

!-------!--------------------------------------!------------------------------!

! 06 ! CONTR BACKGR TIME DID NOT COMPLETE ! !

!-------!--------------------------------------!------------------------------!

! 07 ! CONTR LAST REAL TIME DID NOT FINISH ! !

!-------!--------------------------------------!------------------------------!

! 08 ! CONTR ROM CRC ! PRESS CONTR. 1 (2) !

!-------!--------------------------------------!------------------------------!

! 09 ! CONTR RS422 WRAPAROUND ! !

!-------!--------------------------------------!------------------------------!

! 10 ! CONTR RS422 CHECKSUM ! !

!-------!--------------------------------------!------------------------------!

! 11 ! CALIBRATION TIME (CLOSED) ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 12 ! G/A WATCHDOG REFRESH TOO EARLY FAIL ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 13 ! G/A WATCHDOG REFRESH TOO LATE FAIL ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 14 ! ADIRS 1 DATA OUT OF RANGE ! ADIRS 1 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 15 ! ADIRS 2 DATA OUT OF RANGE ! ADIRS 2 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 16 ! CONTR A/D FRAME LATE ! !

!-------!--------------------------------------!------------------------------!

! 17 ! EIU SIGNAL REPLACED ! EIU SIGNAL REPLACED !

!-------!--------------------------------------!------------------------------!

! 18 ! CONTR ALU ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 19 ! ADIRS 1 DATA FAULT ! NO DATA FROM ADIRS 1 !

!-------!--------------------------------------!------------------------------!

! 20 ! ADIRS 2 DATA FAULT ! NO DATA FROM ADIRS 2 !

!-------!--------------------------------------!------------------------------!

! 21 ! ADIRS 3 DATA FAULT ! NO DATA FROM ADIRS 3 !

!-------!--------------------------------------!------------------------------!

! 22 ! ALL MUX FAIL ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 23 ! CONTR RS422 ACTIVITY ! !

!-------!--------------------------------------!------------------------------!

! 24 ! SLEW RATE END TO END (CLOSED) ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 25 ! RVT CALIBRATION (OPEN) ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 26 ! RVT CALIBRATION (CLOSED) ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 27 ! ADIRS 3 DATA OUT OF RANGE ! ADIRS 3 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 28 ! STATE CHANGE INTERRUPT ! !

!-------!--------------------------------------!------------------------------!

! 29 ! STATE CHANGE START POSITION ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 30 ! PRESS SENSOR AGAINST ADC ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 31 ! CONTR SW TIMER EARLY ! !

!-------!--------------------------------------!------------------------------!

! 32 ! SYSTEM FAIL FLAG ! !

!-------!--------------------------------------!------------------------------!

! 33 ! LOW CABIN PRESSURE ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 34 ! HIGH CABIN PRESSURE RATE ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 35 ! LGCIU SIGNAL REPLACED ! LGCIU SIGNAL REPLACED !

!-------!--------------------------------------!------------------------------!

! 36 ! CONTR POWER SUPPLY +15V ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 37 ! CONTR POWER SUPPLY -15V ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 38 ! CONTR A/D CONVERTER ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 39 ! NO TEMP UPDATE IN PRESS SENSOR ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 40 ! CONTR PASS SIGN WRAPAROUND ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 41 ! CONTR FAULT WARNING W/A ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 42 ! PRESS DELTA RESTART ! !

!-------!--------------------------------------!------------------------------!

! 43 ! MODE FAIL FLAG (NVM) ! !

!-------!--------------------------------------!------------------------------!

! 44 ! CFDS BUS ! !

!-------!--------------------------------------!------------------------------!

! 45 ! CONTR ARINC 429 MUX 1 ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 46 ! CONTR ARINC 429 MUX 2 ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 47 ! CONTR ARINC 429 MUX 3 ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 48 ! GWDOG INIT TEST FAULT ! !

!-------!--------------------------------------!------------------------------!

! 49 ! PRESSURE SENSOR RANGE ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 50 ! LAND FIELD ELEV SELECT ! LFES !

!-------!--------------------------------------!------------------------------!

! 51 ! CONTR RS422 TXT/RXT ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 52 ! ACTUATOR RS422 TXT/RXT ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 53 ! G/A WATCHDOG CLOCK FAIL ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 54 ! FMGS 1 DATA FAULT ! NO DATA FROM FMGS 1 !

!-------!--------------------------------------!------------------------------!

! 55 ! FMGS 2 DATA FAULT ! NO DATA FROM FMGS 2 !

!-------!--------------------------------------!------------------------------!

! 56 ! 28V DRIVE LOW ! !

!-------!--------------------------------------!------------------------------!

! 57 ! LOW VOLTAGE CUTOFF ! !

!-------!--------------------------------------!------------------------------!

! 58 ! DRIVE ENABLE SIGNAL (28V) ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 59 ! HIGH SIDE SWITCH SHORT ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 60 ! SLEW RATE END TO END ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 61 ! CABIN PRESSURE REFRESH FAULT ! PRESS CONT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 62 ! STATE CHANGE MOTION (OPEN) ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 63 ! STATE CHANGE MOTION (CLOSED) ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 64 ! ACTUATOR ON CHIP RAM ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 65 ! ACTUATOR EXTERNAL RAM ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 66 ! ACTUATOR ON CHIP RAM AT POR ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 67 ! ACTUATOR EXTERNAL RAM AT POR ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 68 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 69 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 70 ! ACTUATOR BACKGROUND DID NOT COMPLETE ! !

!-------!--------------------------------------!------------------------------!

! 71 ! ACT LAST REAL TIME DID NOT FINISH ! !

!-------!--------------------------------------!------------------------------!

! 72 ! ACTUATOR ROM ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 73 ! RS422 WRAPAROUND (ACTUATOR) ! !

!-------!--------------------------------------!------------------------------!

! 74 ! ACTUATOR RS422 ACTIVITY ! !

!-------!--------------------------------------!------------------------------!

! 75 ! ACTUATOR RS422 INTERRUPT ! !

!-------!--------------------------------------!------------------------------!

! 76 ! ACTUATOR DISCRETE MUX ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 77 ! RVT EXCITATION ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 78 ! RVT RANGE ! OUTFLOW VALVE FDBK ASSY !

!-------!--------------------------------------!------------------------------!

! 79 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 80 ! ACTUATOR A/D FRAME LATE ! !

!-------!--------------------------------------!------------------------------!

! 81 ! ACTUATOR LOOP CLOSURE ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 82 ! ACTUATOR UNUSED INTER OCCURED ! !

!-------!--------------------------------------!------------------------------!

! 83 ! ACTUATOR ALU ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 84 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 85 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 86 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 87 ! ACTUATOR PWR SUPPLY +15V OR A/D CONV ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 88 ! ACTUATOR MOTOR HALL SENSOR ! OUTFLOW VALVE AUTO MOT 1 (2) !

!-------!--------------------------------------!------------------------------!

! 89 ! ACTUATOR S/W TIMER TOO EARLY ! !

!-------!--------------------------------------!------------------------------!

! 90 ! ACTUATOR ALT LIMIT SWITCH CLOSED ! !

!-------!--------------------------------------!------------------------------!

! 91 ! ACTUATOR RS422 CHECKSUM ! !

!-------!--------------------------------------!------------------------------!

! 92 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 93 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 94 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 95 ! UNUSED ! !

!_______!______________________________________!______________________________!

E. MCDU Maintenance Messages

NOTE: The details which follow are only applicable for:

Cabin Pressure Controllers 9022-15702-10.

(1) Class 1 Maintenance Messages

NOTE: (XX) = the related fault code for shop maintenance.

-------------------------------------------------------------------------------

| BITE TEST

|-----------------------------------------------------------------------------|

| INDICATION ON THE MCDU | ATA REF. | BITE DETECTION |

-------------------------------------------------------------------------------

PRESS CONTROLLER 1 (XX) 21-31-34 CPC 1 fault

PRESS CONTROLLER 2 (XX) 21-31-34 CPC 2 fault

OUTFLOW VALVE AUTO MOTOR 1 21-31-51 OFV auto motor 1 fault

(XX)

OUTFLOW VALVE AUTO MOTOR 2 21-31-51 OFV auto motor 2 fault

(XX)

OUTFLOW VALVE 21-31-51 OFV electronic box 1 fault

ELECTRONIC 1 (XX)

OUTFLOW VALVE 21-31-51 OFV electronic box 2 fault

ELECTRONIC 2 (XX)

OUTFLOW VALVE FEEDBACK 21-31-51 OFV feedback module fault

ASSY (XX)

OUTFLOW VALVE 21-31-51 OFV fault (mechanical)

(2) Class 3 Maintenance Messages

NOTE: (XX) = the related fault code for shop maintenance.

-------------------------------------------------------------------------------

| BITE TEST

|-----------------------------------------------------------------------------|

| INDICATION ON THE MCDU | ATA REF. | BITE DETECTION |

-------------------------------------------------------------------------------

PRESS CONTROLLER 1 (XX) 21-31-34 CPC 1 fault

PRESS CONTROLLER 2 (XX) 21-31-34 CPC 2 fault

LFES Landing field elevation selector fault

OUTFLOW VALVE 21-31-51 Outflow valve fault (mechanical)

BLOCKED (XX)

FMGS 1 OUT OF RANGE (XX) 22-83-34 CPC 1(2) receives incorrect FMGS data

FMGS 2 OUT OF RANGE (XX) 22-83-34 CPC 1(2) receives incorrect FMGS data

NO DATA FROM FMGS 1 (XX) 22-83-34 CPC 1(2) receives no data from the

FMGS 1

NO DATA FROM FMGS 2 (XX) 22-83-34 CPC 1(2) receives no data from the

FMGS 2

LGCIU SIG. REPLACED (XX) 32-31-71 LGCIU signal mismatched

ADIRS 1 OUT OF RANGE (XX) 34-12-34 CPC 1(2) receives incorrect ADIRS 1

data

ADIRS 2 OUT OF RANGE (XX) 34-12-34 CPC 1(2) receives incorrect ADIRS 2

data

ADIRS 3 OUT OF RANGE (XX) 34-12-34 CPC 1(2) receives incorrect ADIRS 3

data

NO DATA FROM ADIRS 1 (XX) 34-12-34 CPC 1(2) receives no data from the

ADIRS 1

NO DATA FROM ADIRS 2 (XX) 34-12-34 CPC 1(2) receives no data from the

ADIRS 2

NO DATA FROM ADIRS 3 (XX) 34-12-34 CPC 1(2) receives no data from the

ADIRS 3

EIU SIGNAL REPLACED (XX) 73-25-34 EIU signal mismatched

.-------.--------------------------------------.------------------------------.

! FAULT ! FAULT ORIGIN ! CFDS MESSAGE !

! CODE ! ! !

!-------!--------------------------------------!------------------------------!

! 00 ! RAM_FAILED_REG ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 01 ! RAM_FAILED_RAM ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 02 ! FMS1_DATA_OUT_OF_RANGE ! FMGS1 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 03 ! FMS2_DATA_OUT_OF_RANGE ! FMGS2 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 04 ! ACT_STATUS_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 05 ! CAL_TIME_OPEN_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 06 ! BACKGROUND_TIMEOUT ! !

!-------!--------------------------------------!------------------------------!

! 07 ! SIGNPOST_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 08 ! ROM_CRC_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 09 ! RS422_WR_FAIL ! CONTR !

!-------!--------------------------------------!------------------------------!

! 10 ! RS422_CHECKSUM_FAIL ! CONTR !

!-------!--------------------------------------!------------------------------!

! 11 ! CAL_TIME_CLOSED_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 12 ! WDT_TRIPPED_EARLY_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 13 ! WDT_TRIPPED_LATE_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 14 ! ADIRS1_DATA_OUT_OF_RANGE ! ADIRS1 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 15 ! ADIRS2_DATA_OUT_OF_RANGE ! ADIRS2 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 16 ! AD_FRAME_LATE_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 17 ! EIU_SIGNAL_REPLACED ! EIU SIGNAL REPLACED !

!-------!--------------------------------------!------------------------------!

! 18 ! PC_STEP_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 19 ! ADIRS1_FAIL ! NO DATA FROM ADIRS1 !

!-------!--------------------------------------!------------------------------!

! 20 ! ADIRS2_FAIL ! NO DATA FROM ADIRS2 !

!-------!--------------------------------------!------------------------------!

! 21 ! ADIRS3_FAIL ! NO DATA FROM ADIRS3 !

!-------!--------------------------------------!------------------------------!

! 22 ! ALL_ARINC_MUX_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 23 ! RS422_ACTIVITY_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 24 ! SLEW_RATE_CLOSE_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 25 ! ZCAL_OPEN_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 26 ! ZCAL_CLOSED_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 27 ! ADIRS3_DATA_OUT_OF_RANGE ! ADIRS3 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 28 ! STATE_CHANGE_DURING_SCBIT ! !

!-------!--------------------------------------!------------------------------!

! 29 ! SCBIT_START_FAIL ! OUTFL. VAL. BLOCKED !

!-------!--------------------------------------!------------------------------!

! 30 ! PC_VERSUS_PA_FAIL ! CONTR !

!-------!--------------------------------------!------------------------------!

! 31 ! SW_INTERRUPT_TOO_EARLY ! !

!-------!--------------------------------------!------------------------------!

! 32 ! SYSTEM_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 33 ! OFV_BETA_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 34 ! HIGH_CABIN_RATE_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 35 ! LGCIU_SIGNAL_REPLACED ! LGCIU SIG. REPLACED !

!-------!--------------------------------------!------------------------------!

! 36 ! +15V_POWER_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 37 ! -15V_POWER_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 38 ! A/D_CONVERTER_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 39 ! TEMP_REFRESH_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 40 ! PASS_SIGN_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 41 ! FAULT_WARN_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 42 ! PRESSURE_DELTA_RESTART ! !

!-------!--------------------------------------!------------------------------!

! 43 ! NVM_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 44 ! CFDS_BUS_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 45 ! ARINC_MUX1_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 46 ! ARINC_MUX2_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 47 ! ARINC_MUX3_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 48 ! GA_WATCHDOG_INIT_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 49 ! PRESSURE_SENSOR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 50 ! LFES_FAIL ! LFES !

!-------!--------------------------------------!------------------------------!

! 51 ! RS422_FAULT_ISO_CTR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 52 ! RS422_FAULT_ISO_ACT_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 53 ! GA_LOSS_OF_CLOCK_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 54 ! FMS1_FAIL ! NO DATA FROM FMGS1 !

!-------!--------------------------------------!------------------------------!

! 55 ! FMS2_FAIL ! NO DATA FROM FMGS2 !

!-------!--------------------------------------!------------------------------!

! 56 ! 28V_DRIVE_LOW ! !

!-------!--------------------------------------!------------------------------!

! 57 ! 28V_DRIVE_CUT_OFF ! !

!-------!--------------------------------------!------------------------------!

! 58 ! HSS_OPEN_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 59 ! HSS_SHORT_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 60 ! SLEW_RATE_OPEN_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 61 ! PC_REFRESH_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 62 ! SCBIT_OPEN_FAIL ! OUTFL. VAL. BLOCKED !

!-------!--------------------------------------!------------------------------!

! 63 ! SCBIT_CLOSE_FAIL ! OUTFL. VAL. BLOCKED !

!-------!--------------------------------------!------------------------------!

! 64 ! OFV_RAM_FAIL_RAM ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 65 ! OFV_RAM_FAIL_REG ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 66 ! OFV_INIT_RAM_FAIL_REG ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 67 ! OFV_INIT_RAM_FAIL_RAM ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 68 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 69 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 70 ! OFV_BACKGROUND_TIMEOUT ! !

!-------!--------------------------------------!------------------------------!

! 71 ! OFV_SIGNPOST_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 72 ! OFV_ROM_CRC_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 73 ! OFV_RS422_WR_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 74 ! OFV_RS422_ACTIVITY_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 75 ! OFV_RS422_RCVR_INTR_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 76 ! OFV_DISCRETE_MUX_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

! ! or ! !

! ! MOTOR_DIRECTION_WR_FAIL (AMI) ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 77 ! OFV_SENSOR_EXCITATION_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 78 ! OFV_SENSOR_RANGE_FAIL ! OUTFL.V FEEDB ASSY 1 (2) !

!-------!--------------------------------------!------------------------------!

! 79 ! OFV_AC_ID_A320 ! !

!-------!--------------------------------------!------------------------------!

! 80 ! OFV_A/D_FRAME_LATE_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 81 ! OFV_LOOP_CLOSURE_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 82 ! OFV_UNUSED_INTR ! !

!-------!--------------------------------------!------------------------------!

! 83 ! OFV_ALU_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 84 ! OFV_CHAN1_SEL ! !

!-------!--------------------------------------!------------------------------!

! 85 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 86 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 87 ! OFV_A/D_CONVERT_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 88 ! OFV_HALL_SENSOR_FAIL ! OUTFL.V AUTO MOTOR 1 (2) !

!-------!--------------------------------------!------------------------------!

! 89 ! OFV_SW_INTR_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 90 ! OFV_CAB_PRESS_SWITCH_ACTIVE ! !

!-------!--------------------------------------!------------------------------!

! 91 ! OFV_RS422_MSSAGE_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 92 ! OFV_AC_PIN_PROG_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 93 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 94 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 95 ! UNUSED ! !

!_______!______________________________________!______________________________!

F. MCDU Maintenance Messages

NOTE: The details which follow are only applicable for:

Cabin Pressure Controllers 20791-02AB and subsequent.

(1) Class 1 Maintenance Messages

NOTE: (XX) = the related fault code for shop maintenance.

-------------------------------------------------------------------------------

| BITE TEST

|-----------------------------------------------------------------------------|

| INDICATION ON THE MCDU | ATA REF. | BITE DETECTION |

-------------------------------------------------------------------------------

PRESS CONTROLLER 1 (XX) 21-31-34 CPC 1 fault

PRESS CONTROLLER 2 (XX) 21-31-34 CPC 2 fault

OUTFLOW VALVE ELEC 1 (XX) 21-31-51 OFV electronic box 1 fault

OUTFLOW VALVE ELEC 2 (XX) 21-31-51 OFV electronic box 2 fault

(2) Class 3 Maintenance Messages

NOTE: (XX) = the related fault code for shop maintenance.

-------------------------------------------------------------------------------

| BITE TEST

|-----------------------------------------------------------------------------|

| INDICATION ON THE MCDU | ATA REF. | BITE DETECTION |

-------------------------------------------------------------------------------

PRESS CONTROLLER 1 (XX) 21-31-34 CPC 1 fault

PRESS CONTROLLER 2 (XX) 21-31-34 CPC 2 fault

OUTFL.VAL.BLOCKED (XX) 21-31-51 Outflow valve fault (mechanical)

FMGS 1 OUT OF RANGE (XX) 22-83-34 CPC 1(2) receives incorrect FMGS data

FMGS 2 OUT OF RANGE (XX) 22-83-34 CPC 1(2) receives incorrect FMGS data

NO DATA FROM FMGS 1 (XX) 22-83-34 CPC 1(2) receives no data from the

FMGS 1

NO DATA FROM FMGS 2 (XX) 22-83-34 CPC 1(2) receives no data from the

FMGS 2

LGCIU SIGNAL REPLACED (XX) 32-31-71 LGCIU signal mismatched

ADIRS 1 OUT OF RANGE (XX) 34-12-34 CPC 1(2) receives incorrect ADIRS 1

data

ADIRS 2 OUT OF RANGE (XX) 34-12-34 CPC 1(2) receives incorrect ADIRS 2

data

ADIRS 3 OUT OF RANGE (XX) 34-12-34 CPC 1(2) receives incorrect ADIRS 3

data

NO DATA FROM ADIRS 1 (XX) 34-12-34 CPC 1(2) receives no data from the

ADIRS 1

NO DATA FROM ADIRS 2 (XX) 34-12-34 CPC 1(2) receives no data from the

ADIRS 2

NO DATA FROM ADIRS 3 (XX) 34-12-34 CPC 1(2) receives no data from the

ADIRS 3

EIU SIGNAL REPLACED (XX) 73-25-34 EIU signal mismatched

.-------.--------------------------------------.------------------------------.

! FAULT ! FAULT ORIGIN ! CFDS MESSAGE !

! CODE ! ! !

!-------!--------------------------------------!------------------------------!

! 00 ! RAM_FAILED_REG ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 01 ! RAM_FAILED_RAM ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 02 ! FMS_1 DATA_OUT_OF_RANGE ! FMGS 1 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 03 ! FMS_2_DATA_OUT_OF_RANGE ! FMGS 2 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 04 ! ACT_STATUS_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 05 ! CAL_TIME_OPEN_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 06 ! BACKGROUND_TIMEOUT ! !

!-------!--------------------------------------!------------------------------!

! 07 ! ! !

!-------!--------------------------------------!------------------------------!

! 08 ! ROM_CRC_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 09 ! RS422_WR_FAIL ! CONTR !

!-------!--------------------------------------!------------------------------!

! 10 ! RS422_CHECKSUM_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 11 ! CAL_TIME_CLOSED_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 12 ! WDT_EXPIRED_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 13 ! PC_STEP_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 14 ! ADIRS1_DATA_OUT_OF_RANGE ! ADIRS1 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 15 ! ADIRS2_DATA_OUT_OF_RANGE ! ADIRS2 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 16 ! AD_FRAME_LATE_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 17 ! EIU_SIGNAL_REPLACED ! EIU SIGNAL REPLACED !

!-------!--------------------------------------!------------------------------!

! 18 ! ZCAL_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 19 ! ADIRS1_FAIL ! NO DATA FROM ADIRS1 !

!-------!--------------------------------------!------------------------------!

! 20 ! ADIRS2_FAIL ! NO DATA FROM ADIRS2 !

!-------!--------------------------------------!------------------------------!

! 21 ! ADIRS3_FAIL ! NO DATA FROM ADIRS 3 !

!-------!--------------------------------------!------------------------------!

! 22 ! ARINC_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 23 ! RS422_ACTIVITY_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 24 ! SLEW_RATE_CLOSE_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 25 ! ZCAL_OPEN_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 26 ! ZCAL_CLOSE_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 27 ! ADIRS3_DATA_OUT_OF_RANGE ! ADIRS3 OUT OF RANGE !

!-------!--------------------------------------!------------------------------!

! 28 ! STATE_CHANGE_DURING_SCBIT ! !

!-------!--------------------------------------!------------------------------!

! 29 ! SCBIT_START_FAIL ! OUTFL.VAL.BLOCKED !

!-------!--------------------------------------!------------------------------!

! 30 ! PC_VERSUS_PA_FAIL ! CONTR !

!-------!--------------------------------------!------------------------------!

! 31 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 32 ! SYSTEM FAIL ! !

!-------!--------------------------------------!------------------------------!

! 33 ! OFV_BETA_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 34 ! HIGH_CABIN_RATE_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 35 ! LGCIU_SIGNAL_REPLACED ! LGCIU SIG REPLACED !

!-------!--------------------------------------!------------------------------!

! 36 ! +15V_POWER_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 37 ! -15V_POWER_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 38 ! A/D_CONVERTER_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 39 ! CFDS_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 40 ! PASS_SIGN_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 41 ! FAULT_WARN_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 42 ! PC_CAL_ROM_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 43 ! NVM_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 44 ! CFDS_BUS_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 45 ! ADIRS1_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 46 ! ADIRS2_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 47 ! ADIRS3_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 48 ! WDT_TEST_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 49 ! FMS1_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 50 ! LFES_FAIL ! LFES !

!-------!--------------------------------------!------------------------------!

! 51 ! RS422_FAULT_ISO_CTR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 52 ! RS422_FAULT_ISO_ACT_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 53 ! FMS2_WR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 54 ! FMS1_FAIL ! NO DATA FROM FMGS1 !

!-------!--------------------------------------!------------------------------!

! 55 ! FMS2_FAIL ! NO DATA FROM FMGS2 !

!-------!--------------------------------------!------------------------------!

! 56 ! 28V_DRIVE_LOW ! !

!-------!--------------------------------------!------------------------------!

! 57 ! 28V_DRIVE_CUT_OFF ! !

!-------!--------------------------------------!------------------------------!

! 58 ! HSS_OPEN_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 59 ! HSS_SHORT_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 60 ! SLEW_RATE_OPEN_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 61 ! PC_SENSOR_FAIL ! PRESS CONTROLLER 1 (2) !

!-------!--------------------------------------!------------------------------!

! 62 ! SCBIT_OPEN_FAIL ! OUTFL.VAL.BLOCKED !

!-------!--------------------------------------!------------------------------!

! 63 ! SCBIT_CLOSE_FAIL ! OUTFL.VAL.BLOCKED !

!-------!--------------------------------------!------------------------------!

! 64 ! OFV_RAM_FAIL_RAM ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 65 ! OFV_RAM_FAIL_REG ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 66 ! OFV_INIT_RAM_FAIL_REG ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 67 ! OFV_INIT_RAM_FAIL_RAM ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 68 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 69 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 70 ! OFV_BACKGROUND_TIME_OUT ! !

!-------!--------------------------------------!------------------------------!

! 71 ! OFV_SIGNPOST_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 72 ! OFV_ROM_CRC_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 73 ! OFV_RS422_WR_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 74 ! OFV_RS422_ACTIVITY_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 75 ! OFV_RS422_RCVR_INTR_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 76 ! OFW_DISCRETE_MUX_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

! ! or ! !

! ! MOTOR_DIRECTION_WR_FAIL (AMI) ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 77 ! OFV_SENSOR_EXITATION_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 78 ! OFV_SENSOR_RANGE_FAIL ! OUTFLOW VALVE FDBK ASSY !

!-------!--------------------------------------!------------------------------!

! 79 ! OFV_AC_ID_A320 ! !

!-------!--------------------------------------!------------------------------!

! 80 ! OFV_A/D_FRAME_LATE_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 81 ! OFV_LOOP_CLOSURE_FAIL ! OUTFLOW VALVE !

!-------!--------------------------------------!------------------------------!

! 82 ! OFV_UNUSED_INTR ! !

!-------!--------------------------------------!------------------------------!

! 83 ! OFV_ALU_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 84 ! OFV_CHAN1_SEL ! !

!-------!--------------------------------------!------------------------------!

! 85 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 86 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 87 ! OFV_A/D_CONVERT_FAIL ! OUTFLOW VALVE ELEC 1 (2) !

!-------!--------------------------------------!------------------------------!

! 88 ! OFV_HALL_SENSOR_FAIL ! OUTFL.V AUTO MOTOR 1 (2) !

!-------!--------------------------------------!------------------------------!

! 89 ! OFV__SW_INTR_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 90 ! OFV_CAB_PRESS_SW_ACTIVE ! !

!-------!--------------------------------------!------------------------------!

! 91 ! OFV_RS422_MESSAGE_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 92 ! OFV_AC_PIN_PROG_FAIL ! !

!-------!--------------------------------------!------------------------------!

! 93 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 94 ! UNUSED ! !

!-------!--------------------------------------!------------------------------!

! 95 ! UNUSED ! !

!_______!______________________________________!______________________________!

[Rev.10 from 2021] 2026.04.01 04:52:31 UTC