DOC AIRBUS | AMM A320FECAM ENGINE/WARNING DISPLAY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The upper Electronic Centralized Aircraft Monitoring (ECAM) Display Unit (DU) is dedicated to the presentation of the information that follows:
** ON A/C NOT FOR ALL The upper Electronic Centralized Aircraft Monitoring (ECAM) Display Unit (DU) is dedicated to the presentation of the information that follows:
- Primary engine parameters
- Slats & Flaps
- Fuel on board
- Warnings & memo messages.
2. Component Location
** ON A/C NOT FOR ALL 
Upper ECAM DU/ECAM Control Panel Location| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||||
| 4WT1 | DU-ECAM, UPPER | 4VU | 210 | 31-63-22 | |
3. Display Partition
The parameters displayed on the upper ECAM DU are arranged as shown in the related figure.
** ON A/C NOT FOR ALL The parameters displayed on the upper ECAM DU are arranged as shown in the related figure.
4. Primary Engine Parameters
These parameters are arranged as shown in the related figure.
** ON A/C NOT FOR ALL These parameters are arranged as shown in the related figure.
5. Primary Engine Parameters Description
A. General
In normal operation the engines are controlled in the Engine Pressure Ratio (EPR) mode. If the EPR mode is no longer available, the engines are controlled in the backup mode. In this case the N1 becomes the power management parameter. Selection of the backup mode is also possible with the N1 MODE Pushbutton Switch (P/BSW), on the ENG section of the overhead panel.
In normal operation the engines are controlled in the Engine Pressure Ratio (EPR) mode. If the EPR mode is no longer available, the engines are controlled in the backup mode. In this case the N1 becomes the power management parameter. Selection of the backup mode is also possible with the N1 MODE Pushbutton Switch (P/BSW), on the ENG section of the overhead panel.
B. EPR Indications
The EPR is the ratio of the pressures value measured at the entrance and the exit of the engine.
The EPR indication is displayed in analog and digital forms.
A needle and a scale, below which the EPR digital value appears, give the analog indication.
The EPR actual analog-display (the needle) and the digital display are in green color in normal operation. In the backup mode it is replaced by an amber "XX" indication.
The EPR digital value is surrounded by a grey box when the engine is controlled in its normal mode.
The EPR scale is shown in white in normal operation. In the backup mode it is replaced by an amber circle.
The EPR is the ratio of the pressures value measured at the entrance and the exit of the engine.
The EPR indication is displayed in analog and digital forms.
A needle and a scale, below which the EPR digital value appears, give the analog indication.
The EPR actual analog-display (the needle) and the digital display are in green color in normal operation. In the backup mode it is replaced by an amber "XX" indication.
The EPR digital value is surrounded by a grey box when the engine is controlled in its normal mode.
The EPR scale is shown in white in normal operation. In the backup mode it is replaced by an amber circle.
NOTE: There is no EPR red line, hence no part of the EPR analog scale is red.
C. EPR Maximum (MAX)
The EPR MAX value is displayed in analog form with a thick amber mark across the EPR scale. The EPR MAX value is the EPR limit value related to the full forward position of the throttle control lever.
The EPR MAX value is displayed in analog form with a thick amber mark across the EPR scale. The EPR MAX value is the EPR limit value related to the full forward position of the throttle control lever.
D. EPR Throttle
The EPR throttle symbol (small cyan circle) represents the EPR predictive value for each engine.
The EPR throttle symbol (small cyan circle) represents the EPR predictive value for each engine.
E. EPR Command
The EPR command is displayed in analog form with the four green arcs of a circle joining the EPR actual needle to the EPR command value. Therefore when the EPR value is stabilized, the symbol is reduced to a mark covered by the EPR actual needle.
The EPR command is displayed only with the Autothrust (A/THR) engaged.
The EPR command is displayed in analog form with the four green arcs of a circle joining the EPR actual needle to the EPR command value. Therefore when the EPR value is stabilized, the symbol is reduced to a mark covered by the EPR actual needle.
The EPR command is displayed only with the Autothrust (A/THR) engaged.
F. EPR Limit
The EPR limit displayed is:
The EPR limit display-selection from engine 1, if the EPR limit of engine 1 is valid (no backup mode for engine 1) and if one of the conditions agrees:
The EPR limit displayed is:
- The EPR limit value delivered by the Electronic Engine Control (EEC) linked to the fastest engine, or
- The EPR limit of the EEC still valid after one EEC has failed, or
- The EPR limit of the EEC linked to the engine which is still in operation after one engine failure.
The EPR limit display-selection from engine 1, if the EPR limit of engine 1 is valid (no backup mode for engine 1) and if one of the conditions agrees:
- No engine is in operation and Throttle Lever Angle (TLA) of engine 1 is selected.
- Only engine 1 is in operation.
- The two engines are in operation and the EPR of engine 1 is superior to the EPR of engine 2 or the EPR of engine 2 is not valid.
G. EPR Limit Mode
The EPR limit mode is the mode in which the above EPR limit value is computed.
The displayed EPR-limit mode is the mode delivered by the EEC, selected for the display of the EPR limit value.
There are 12 possible modes:
These modes are selected as per the Full Authority Digital Engine Control (FADEC) mode selection.
In the FLXTO, the value of the FLXTO temperature is shown below the EPR limit value in cyan color.
The digits are replaced by the cyan dashes, if the static air temperature minus 10°C, is strictly superior to the FLXTO temperature.
The indication shows for instance:
FLEX
1.355
35°C.
The EPR limit mode is the mode in which the above EPR limit value is computed.
The displayed EPR-limit mode is the mode delivered by the EEC, selected for the display of the EPR limit value.
There are 12 possible modes:
- Takeoff/Go Around (TOGA) displayed as TOGA
- Flexible Take-Off (FLXTO) displayed as FLX
- Derated Take Off (DTO) 1 displayed as D04
- DTO 2 displayed as D08
- DTO 3 displayed as D12
- DTO 4 displayed as D16
- DTO 5 displayed as D20
- DTO 6 displayed as D24
- DTO 7 displayed as D40
- Maximum Continuous Thrust (MCT) displayed as MCT
- Climb displayed as CLB
- Maximum reverse displayed as MREV.
These modes are selected as per the Full Authority Digital Engine Control (FADEC) mode selection.
In the FLXTO, the value of the FLXTO temperature is shown below the EPR limit value in cyan color.
The digits are replaced by the cyan dashes, if the static air temperature minus 10°C, is strictly superior to the FLXTO temperature.
The indication shows for instance:
FLEX
1.355
35°C.
NOTE: In the maximum reverse mode, the EEC does not compute the limit mode value. Consequently, no digital value is displayed in this mode. Only "MREV" is displayed.
H. N1 Limit Display
The N1 limit is shown when the two engines are in the backup mode (N1 rated or N1 unrated mode selected, and not reverse mode).
The EPR limit display is replaced by a specific N1 limit display where a white box surrounding the N1 limit indications and a title "N1 MODE" show that the engines are controlled in the N1 mode.
The N1 limit display-selection from engine 1, if the N1 limit of engine 1 is valid (both the engines are in the backup mode) and if one of the conditions agrees:
The N1 limit value is shown in green (4 digits) with a step of 0.1% rpm.
The N1 limit modes are the same as in the EPR limit mode. These modes are displayed as per the FADEC mode selection.
The N1 limit is shown when the two engines are in the backup mode (N1 rated or N1 unrated mode selected, and not reverse mode).
The EPR limit display is replaced by a specific N1 limit display where a white box surrounding the N1 limit indications and a title "N1 MODE" show that the engines are controlled in the N1 mode.
The N1 limit display-selection from engine 1, if the N1 limit of engine 1 is valid (both the engines are in the backup mode) and if one of the conditions agrees:
- No engine is in operation and the TLA of engine 1 is selected.
- Only engine 1 is in operation.
- The two engines are in operation and the N1 of engine 1 is superior to the N1 of engine 2 or the N1 of engine 2 is not valid.
- The N1 limit is not valid for engine 2.
The N1 limit value is shown in green (4 digits) with a step of 0.1% rpm.
The N1 limit modes are the same as in the EPR limit mode. These modes are displayed as per the FADEC mode selection.
I. Exhaust Gas Temperature (EGT) Indication
The EGT indication is displayed in analog and digital forms.
A needle and a scale, below which the EGT digital value appears, give the analog indication.
In normal operation, the analog and digital indications are in green.
The color of the analog and digital indications changes from green to amber, if the EGT value exceeds the EGT amber line. The position of the amber line on the scale varies as per the type of engines installed (refer to EGT amber-line parameter in paragraph Engine-X Parameter Definition).
The color of the digital and analog indications changes to red, if the EGT value exceeds the EGT red-line value.
The needle is not shown and the digital value is replaced by an amber "XX" indication if the EGT actual value is not valid.
The EGT amber line takes two positions, one in the starting sequence (EGT START AMBER LINE) and another after the starting sequence (EGT MCT AMBER LINE).
The EGT amber line is not shown, if:
The EGT indication is displayed in analog and digital forms.
A needle and a scale, below which the EGT digital value appears, give the analog indication.
In normal operation, the analog and digital indications are in green.
The color of the analog and digital indications changes from green to amber, if the EGT value exceeds the EGT amber line. The position of the amber line on the scale varies as per the type of engines installed (refer to EGT amber-line parameter in paragraph Engine-X Parameter Definition).
The color of the digital and analog indications changes to red, if the EGT value exceeds the EGT red-line value.
The needle is not shown and the digital value is replaced by an amber "XX" indication if the EGT actual value is not valid.
The EGT amber line takes two positions, one in the starting sequence (EGT START AMBER LINE) and another after the starting sequence (EGT MCT AMBER LINE).
The EGT amber line is not shown, if:
- The throttle lever angle exceeds 36.6 degrees.
Or - The throttle lever angle exceeds 33.3 degrees with the FLXTO mode or the DTO mode.
Or - The alpha floor protection is commanded.
Or - The reverse mode is selected.
Or - The AUTO TOGA mode is engaged.
NOTE: The EGT MCT amber line is not shown for the engine IAE V2500.
J. EGT Red Line
The EGT red line is represented with an arc shaped red-ribbon at the end of the EGT scale. If the EGT value exceeds the EGT red line (even for a short period of time) a small red line appears across the EGT scale and stays at the maximum value reached by the EGT needle.
This indicates the EGT exceedance condition.
The maximum value reached is stored in the Built-In Test Equipment (BITE) memory.It is readable on the Multipurpose Control & Display Unit (MCDU) in the maintenance mode through the Display Management Computer (DMC) menu.
In the EGT exceedance condition, the small red line disappears only after a new start or after a maintenance action through the MCDU.
The EGT red line is represented with an arc shaped red-ribbon at the end of the EGT scale. If the EGT value exceeds the EGT red line (even for a short period of time) a small red line appears across the EGT scale and stays at the maximum value reached by the EGT needle.
This indicates the EGT exceedance condition.
The maximum value reached is stored in the Built-In Test Equipment (BITE) memory.It is readable on the Multipurpose Control & Display Unit (MCDU) in the maintenance mode through the Display Management Computer (DMC) menu.
In the EGT exceedance condition, the small red line disappears only after a new start or after a maintenance action through the MCDU.
K. N1 Indication
The N1 indication is displayed in analog and digital forms. A needle below which the N1 digital value appears gives the analog indication.
The N1 actual analog-display (needle) and digital display:
The N1 digital value is surrounded by a grey box when the N1 rated or the N1 unrated mode is selected.
If the N1 actual value is not valid, the digits are replaced by an amber "XX" indication (without the box) and the scale is replaced by an amber arc of circle.
The N1 indication is displayed in analog and digital forms. A needle below which the N1 digital value appears gives the analog indication.
The N1 actual analog-display (needle) and digital display:
- Are shown in green, in normal operation.
- Change from green to amber, if the N1 actual value exceeds the N1 limit value + 1% and the N1 limit value is valid.
- Change from amber to green, if the N1 actual value is less than the N1 limit value.
- Change from amber to red, if the N1 actual value exceeds the N1 red-line value.
- Change from red to amber, if the N1 actual value drops below the N1 red-line value - 1%.
The N1 digital value is surrounded by a grey box when the N1 rated or the N1 unrated mode is selected.
If the N1 actual value is not valid, the digits are replaced by an amber "XX" indication (without the box) and the scale is replaced by an amber arc of circle.
L. N1 Red Line
The N1 red line is represented by an arc shaped red-ribbon situated at the end of the scale.
If the N1 actual value exceeds the N1 red line (even for a short period of time), a small red line appears across the N1 scale and stays at the maximum value reached by the N1 needle. This indicates the N1 exceedance condition.
The maximum value reached is stored in the BITE memory and readable on the MCDU in the maintenance mode through the DMC menu.
In the N1 exceedance condition, the small red line disappears only after a new start or after a maintenance action through the MCDU.
N1 command:
N1 MAX:
Degraded data:
The N1 red line is represented by an arc shaped red-ribbon situated at the end of the scale.
If the N1 actual value exceeds the N1 red line (even for a short period of time), a small red line appears across the N1 scale and stays at the maximum value reached by the N1 needle. This indicates the N1 exceedance condition.
The maximum value reached is stored in the BITE memory and readable on the MCDU in the maintenance mode through the DMC menu.
In the N1 exceedance condition, the small red line disappears only after a new start or after a maintenance action through the MCDU.
N1 command:
- The N1 command symbol (small cyan circle) is shown in the backup mode if the N1 command is valid.
N1 MAX:
- The N1 MAX is shown only in the backup mode.
- It is shown in analog form with a thick amber mark across the N1 scale, if the N1 limit and the N1 actual values are valid.
Degraded data:
- The last N1 significant digit is shown with the two amber dashes, if the direct N1 measurement-system (Flight Warning Computer (FWC) signal) is faulty.
M. N2 Indication
The N2 indication is displayed in digital form only.
In the starting sequence, the brightness of the N2 indication is in double on grey background.
If the N2 actual value exceeds the N2 red-line value:
If the N2 actual value is not valid, the digits are replaced by an amber "XX" indication.
Like the N1, the N2 exceeding values are stored in the BITE memory and available on the MCDU through a maintenance menu.
The red cross disappears only after a start or after a maintenance action through the MCDU.
If the N2 data is degraded, the last significant digit is shown with the two amber dashes.
The N2 indication is displayed in digital form only.
In the starting sequence, the brightness of the N2 indication is in double on grey background.
If the N2 actual value exceeds the N2 red-line value:
- The color of the N2 actual indication changes from green to red.
- A red cross appears next to the digital indication to indicate the pilot about the N2 exceedance.
If the N2 actual value is not valid, the digits are replaced by an amber "XX" indication.
Like the N1, the N2 exceeding values are stored in the BITE memory and available on the MCDU through a maintenance menu.
The red cross disappears only after a start or after a maintenance action through the MCDU.
If the N2 data is degraded, the last significant digit is shown with the two amber dashes.
N. EPR Trend
Four arcs of the circle join the EPR command value to the EPR current value and feature the EPR trend. In addition, a green triangle next to the EPR command value enhances the EPR direction and stays displayed even when the two values are very close. It disappears when the EPR value has reached the EPR command value.
Four arcs of the circle join the EPR command value to the EPR current value and feature the EPR trend. In addition, a green triangle next to the EPR command value enhances the EPR direction and stays displayed even when the two values are very close. It disappears when the EPR value has reached the EPR command value.
O. Fuel Flow
The fuel flow indication is provided to the pilots in digital form with five digits with a step of 20 kg/h or 40 lbs/h.
Two values are displayed (one per engine).
The fuel flow indication is shown in green in normal operation.
It is replaced by an amber "XX" indication, if the fuel flow value is not valid.
The fuel flow indication is provided to the pilots in digital form with five digits with a step of 20 kg/h or 40 lbs/h.
Two values are displayed (one per engine).
The fuel flow indication is shown in green in normal operation.
It is replaced by an amber "XX" indication, if the fuel flow value is not valid.
P. Reverse Indications
An amber "REV" indication in a grey box comes into view in the middle of the EPR analog indication, if at least one reverse cowl is not stowed and the DC1 BUS is on.
This indication becomes green when all the reverser cowls are deployed.
Abnormal conditions:
When the aircraft is on the ground, an amber "REV" indication in a grey box comes into view, if:
An amber "REV" indication in a grey box comes into view in the middle of the EPR analog indication, if at least one reverse cowl is not stowed and the DC1 BUS is on.
This indication becomes green when all the reverser cowls are deployed.
Abnormal conditions:
When the aircraft is on the ground, an amber "REV" indication in a grey box comes into view, if:
- The reverse mode is not selected and the two reversers are deployed, or
- At least one reverser cowl is not stowed and the DC1 BUS is on.
- At least one reverser cowl is not stowed and the DC1 BUS is on, or
- The two reversers are deployed.
Q. AVAIL Indication
The green "AVAIL" indication (surrounded by a grey box) comes into view in the middle of the EPR analog indication. This indicates that the engine relight is successful.
In flight, a green "AVAIL" message flashes until the throttle lever angle is greater than 8 degrees (for a minimum of five seconds, or until 60 seconds of elapsed time).
On the ground, a green "AVAIL" message stays until the throttle lever angle is greater than 8 degrees (for a minimum of five seconds, or until 10 seconds of elapsed time).
The "AVAIL" message is not shown if the engine operation is not valid.
The green "AVAIL" indication (surrounded by a grey box) comes into view in the middle of the EPR analog indication. This indicates that the engine relight is successful.
In flight, a green "AVAIL" message flashes until the throttle lever angle is greater than 8 degrees (for a minimum of five seconds, or until 60 seconds of elapsed time).
On the ground, a green "AVAIL" message stays until the throttle lever angle is greater than 8 degrees (for a minimum of five seconds, or until 10 seconds of elapsed time).
The "AVAIL" message is not shown if the engine operation is not valid.
R. Failure Information
In case of failure of any parameter, the associated indication is replaced by an amber "XX" indication. If this parameter is related to EPR or EGT or N1, the scale support is also shown in amber.
In case of failure of any parameter, the associated indication is replaced by an amber "XX" indication. If this parameter is related to EPR or EGT or N1, the scale support is also shown in amber.
S. System Feedback Message
The Electronic Instrument System (EIS) is used to monitor the displayed main engine-parameters (N1, EGT, FF). For the N1 and the EGT parameters, each DU compares the signals received from the EEC with the feedback signals (which reflect the displayed position of the needle and the digital value).
For the fuel flow parameter, the DU compares the direct signal from the EEC with the displayed digital value.
The feedback messages is displayed (in amber) above the Fuel On Board (FOB) indication:
On the first line:
If there is a discrepancy, a warning message is generated by the FWC to indicate a DU failure to the crew.
The FWC generates a caution with:
The message "DISPLAY SYSTEM VERSION INCONSISTENCY" is displayed in the two lines (in amber) upon a signal from a manual code.
The Electronic Instrument System (EIS) is used to monitor the displayed main engine-parameters (N1, EGT, FF). For the N1 and the EGT parameters, each DU compares the signals received from the EEC with the feedback signals (which reflect the displayed position of the needle and the digital value).
For the fuel flow parameter, the DU compares the direct signal from the EEC with the displayed digital value.
The feedback messages is displayed (in amber) above the Fuel On Board (FOB) indication:
On the first line:
- CHECK CAPT PFD
- CHECK F/O PFD.
- CHECK CAPT ND
- CHECK F/O ND
- CHECK SD.
If there is a discrepancy, a warning message is generated by the FWC to indicate a DU failure to the crew.
The FWC generates a caution with:
- Single chime
- MASTER CAUT light
- A message in the lower part of the upper ECAM DU, for instance "ENG1 EGT DISCREPANCY" (amber).
The message "DISPLAY SYSTEM VERSION INCONSISTENCY" is displayed in the two lines (in amber) upon a signal from a manual code.
NOTE: (1): The processing of the engine 1 and 2 parameters is independent.
(2): The values of the EGT, N1, N2 red lines and the transitory overlimit are stored in two independent tables (one per engine). The same applies for the advisory thresholds as regards to the oil pressure, temperature and quantity.
The EGT, N1, N2 red lines and transitory values are sent to the FWCs through the general high-speed output-bus of the DMC.
(2): The values of the EGT, N1, N2 red lines and the transitory overlimit are stored in two independent tables (one per engine). The same applies for the advisory thresholds as regards to the oil pressure, temperature and quantity.
The EGT, N1, N2 red lines and transitory values are sent to the FWCs through the general high-speed output-bus of the DMC.
6. FOB Information
The FOB quantity is shown in green in normal operation.
This indication is given in KG or LBS.
If the FOB data is degraded, the two less significant digits are shown with two dashes.
A half amber box (surrounding the FOB indication) is shown, if:
** ON A/C NOT FOR ALL The FOB quantity is shown in green in normal operation.
This indication is given in KG or LBS.
If the FOB data is degraded, the two less significant digits are shown with two dashes.
A half amber box (surrounding the FOB indication) is shown, if:
- There is a fault in the transfer valve*.
Or - There is an Additional Center Tank (ACT) installed and an ACT amber box is displayed.
Or - The center tank is installed and there is a fault in the center tank pump, and the engine 1 or 2 core speed is at or above idle.
* Not applicable for A321.
7. Engine Types
Tables - one for each engine (for A319, A320 and A321 aircraft), contain the critical thresholds of the engine parameters stored in the DMC memory.
The table used by the DMC and related to the type of engine installed on the aircraft is selected through the pin programming on the DMC.
** ON A/C NOT FOR ALL Tables - one for each engine (for A319, A320 and A321 aircraft), contain the critical thresholds of the engine parameters stored in the DMC memory.
The table used by the DMC and related to the type of engine installed on the aircraft is selected through the pin programming on the DMC.
| ------------------------------------------------------------------------------ |
| ! ! ! DMC MP connector program pin ! |
| ! ENGINE ! A/C !---------------------------------------------------! |
| ! ! ! D5 ! E5 ! D8 ! G5 ! |
| ! ! ! Eng type 0 ! Eng type 1 ! A/C type 0 ! A/C type 1 ! |
| ------------------------------------------------------------------------------ |
| ! IAE A5-V2522 ! A319 ! 0 ! 1 ! 1 ! 0 ! |
| !-----------------!------!------------!------------!------------!------------! |
| ! IAE A5-V2524 ! ! ! ! ! ! |
| !-----------------!------!------------!------------!------------!------------! |
| ! IAE A5-V2527 ! ! ! ! ! ! |
| !-----------------!------!------------!------------!------------!------------! |
| ! IAE A1-V2500 ! A320 ! 0 ! 1 ! 0 ! 1 ! |
| !-----------------!------!------------!------------!------------!------------! |
| ! IAE A5-V2527 ! A320 ! 0 ! 1 ! 0 ! 1 ! |
| !-----------------!------!------------!------------!------------!------------! |
| ! IAE A5-V2529 ! A321 ! 0 ! 0 ! 1 ! 1 ! |
| !-----------------!------!------------!------------!------------!------------! |
| ! IAE A5-V2530 ! A321 ! 0 ! 0 ! 1 ! 1 ! |
| !----------- -----!------!------------!------------!------------!------------! |
| ! IAE A5-V2533GW ! A321 ! 0 ! 1 ! 1 ! 1 ! |
| 1 = GROUND, 0 = OPEN |
8. Engine 1 Parameter Definition
** ON A/C NOT FOR ALL | ------------------------------------------------------------------------ |
| ! Parameter ! Mnemonic ! Equipment ! Label ! Color ! |
| -------!-----------------!--------------!-------------!------------!----------! |
| ! 1 ! N2 Actual ! 9JN2E1 ! EEC1 ! 344-X1 ! Green ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 2 ! Fuel flow ! 9JFFE1 ! EEC1 ! 244-X1 ! Green ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 3 ! EPR Actual ! 9JEPRE1 ! EEC1 ! 340-X1 ! Green ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 4 ! EPR Command ! 9JEPRCMDE1 ! EEC1 ! 341-X1 ! Green ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 5 ! EPR Throttle ! 9JPRCMDE1 ! EEC1 ! 166-X1 ! Cyan ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 6 ! EPR MAX ! 9JEPRTOE1 ! EEC 1 ! 342-X1 ! Amber ! |
| !------!-----------------!-----------------------------------------!----------! |
| ! 7 ! EGT Actual ! 9JEGTE1 ! EEC1 ! 345-X1 ! Green ! |
| !------!-----------------!-----------------------------------------!----------! |
| ! 8 ! EGT Amber Line ! 610 deg. C ! Amber ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 9 ! EGT Red Line ! 610 deg. C ! Red ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 10 ! N1 Command ! 9JN1CMDE1 ! EEC1 ! 254-X1 ! Cyan ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 11 ! N1 MAX ! 9JN1LIME1 ! EEC1 ! 255-X1 ! Amber ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 12 ! N1 Red Line ! 100 % ! Red ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 13 ! N1 Actual ! 9JN1EN1 ! EEC1 ! 344-X1 ! Green ! |
9. Engine 2 Parameter Definition
** ON A/C NOT FOR ALL | ------------------------------------------------------------------------ |
| ! Parameter ! Mnemonic ! Equipment ! Label ! Color ! |
| -------!-----------------!--------------!-------------!------------!----------! |
| ! 1 ! N2 Actual ! 9JN2E2 ! EEC2 ! 344-X0 ! Green ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 2 ! Fuel Flow ! 9JFFE2 ! EEC2 ! 244-X0 ! Green ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 3 ! EPR Actual ! 9JEPRE2 ! EEC2 ! 340-X0 ! Green ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 4 ! EPR Command ! 9JEPRCMDE2 ! EEC2 ! 341-X0 ! Green ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 5 ! EPR Throttle ! 9JEPRTHRE2 ! EEC2 ! 166-X0 ! Cyan ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 6 ! EPR MAX ! 9JEPRTOE ! EEC2 ! 342-X0 ! Amber ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 7 ! EGT Actual ! 9JEGTE2 ! EEC2 ! 345-X0 ! Green ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 8 ! EGT Amber Line ! 610 deg. C ! Amber ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 9 ! EGT Red Line ! 635 deg. C ! Red ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 10 ! N1 Command ! 9JN1CMDE2 ! EEC2 ! 254-X0 ! Cyan ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 11 ! N1 MAX ! 9JN1LIME2 ! EEC2 ! 255-X0 ! Amber ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 12 ! N1 Red Line ! 100 % ! Red ! |
| !------!-----------------!--------------!-------------!------------!----------! |
| ! 13 ! N1 Actual ! 9JN2E2 ! EEC2 ! 344-X0 ! Green ! |
| ------------------------------------------------------------------------------- |
| ! PARAMETER ! LABEL ! ! OPERATION ! |
| ! DEFINITION ! ON DMC ! IAE V2500 ENGINE ! WHEN VALUE ! |
| ! ! O/P BUS ! ! EXCEEDED ! |
| !-----------------------!----------!----------------------!-------------------! |
| ! N1 Red Line ! 110 ! 100 % ! ADV Decrease ! |
| ! ! ! ! ! |
| ! N1 Transitory ! 111 ! 109,4 % ! Engine Shut down ! |
| ! Overspeed ! ! ! ! |
| ! ! ! ! ! |
| ! EGT Red Line ! 243 ! 635 deg.C ! ADV Decrease ! |
| ! ! ! ! ! |
| ! EGT Amber Line ! 240 ! 610 deg.C ! ADV Decrease if ! |
| ! ! ! ! over temperature ! |
| ! 1 ! ! for more than ! |
| ! ! ! ! 5 minute ! |
| ! ! ! ! ! |
| ! N2 Red Line ! 126 ! 100 % ! ADV Decrease ! |
| ! ! ! ! ! |
| ! N2 Transitory ! 127 ! 105.7 % ! Engine Shut down ! |
| ! Overspeed ! ! ! ! |
| ! ! ! ! ! |
| ! Oil Temperature Limit ! 171 ! 156 deg.C ! ADV Engine Shut ! |
| ! 1st Threshold ! ! ! down if Over ! |
| ! ! ! ! temperature 1 |
| ! ! ! ! for more than 5 ! |
| ! ! ! ! minute ! |
| ! Oil Temperature Limit ! 172 ! 170 deg.C ! Engine Shut down ! |
| ! 2nd Threshold ! ! ! ! |
| ! ! ! ! ! |
| ! Oil Pressure LIMIT ! ! 60 PSI ! Engine Shut Down ! |
| ! ! ! ! if Oil Press Below! |
| ! ! ! ! 60 PSI ! |
| ! ! ! ! ! |
| ! Oil Quantity Limit ! ! 5 QTS (US GALLON) ! ADV ! |
NOTE: The DMC keeps all these values stored in the independent tables, one for each engine type.
10. Engine 1 & 2 Other Parameters
** ON A/C NOT FOR ALL | ------------------------------------------------------------------------ |
| ! Parameter ! Mnemonic ! Equipment ! Label ! Bit ! Color ! |
| -------!-----------------!----------!--------------!--------!------!----------! |
| ! 1 ! Bump rating ! 9JBUMPE1 ! ! ! 3 ! Green ! |
| ! ! ! 9JBUMPE2 ! EEC 1 ! ! ! ! |
| ! ! ! ! (SDI X1) ! ! ! ! |
| !------!-----------------!----------! OR !--------!------!----------! |
| ! 2 ! Select thrust ! TO GA ! ! 272 ! 19 ! Cyan ! |
| ! ! mode ! FLX ! EEC 2 ! ! ! ! |
| ! ! (limit mode) ! MCT ! ! ! 20 ! ! |
| ! ! ! CL ! ! ! ! ! |
| ! ! ! MREV ! ! ! 21 ! ! |
| ! ! ! ! ! ! ! ! |
| ! ! ! ! ! ! ! ! |
| !------!-----------------!----------! !--------!------!----------! |
| ! 3 ! Limit display ! EPRLIM ! (SDI X0) ! 337 ! ! Green ! |
| ! ! (EPR or N1 in ! or N1LIM ! ! 255 ! ! Green ! |
| ! ! backup mode) ! ! ! ! ! ! |
| !------!-----------------!----------! !--------!------!----------! |
| ! 4 ! Flexible ! 9JFLXE1 ! ! 214 ! ! Cyan ! |
| ! ! Temperature ! 9JFLXE2 ! ! ! ! ! |
| !------!-----------------!----------!--------------!--------!------!----------! |
| ! 5 ! Fuel Degraded ! FTFQDM ! FQI ! 247-XX ! 11 ! Amber ! |
| ! ! data ! ! ! ! ! ! |
| !------!-----------------!----------! !--------!------!----------! |
| ! 6 ! Fuel Quantity ! FQTY ! ! 247 ! ! Green ! |
| ! ! ! ! ! ! ! ! |
| !------!-----------------!----------! !--------!------!----------! |
| ! 7 ! Fuel on board ! FOBBOX ! ! 246 ! 20 ! Amber ! |
| ! ! not entirely ! ! ! 273X1 ! 18 ! ! |
| ! ! usable ! ! ! 273X0 ! 18 ! ! |
| ! ! ! ! ! 271 ! 11 ! ! |
| ! ! ! ! ! ! 12 ! ! |
| ! ! ! ! ! ! 13 ! ! |
| ! ! ! ! ! ! 14 ! ! |
| ! ! ! ! ! ! 15 ! ! |
| ! ! ! ! ! ! 17 ! ! |
| ! ! ! ! ! ! 18 ! ! |
| ! ! ! !--------------!--------!------!----------! |
| ! ! ! ! SDAC ! 004-00 ! 14 ! ! |
| ! ! ! ! ! 004-00 ! 16 ! ! |
| ! ! ! ! ! 004-00 ! 17 ! ! |
| ! ! ! ! ! 004-00 ! 22 ! ! |
| ! ! ! ! ! 004-01 ! 20 ! ! |
| ! ! ! ! ! 004-01 ! 21 ! ! |
| ! ! ! ! ! 004-10 ! 20 ! ! |
| ! ! ! ! ! 004-10 ! 21 ! ! |
| ! ! ! ! ! 004-11 ! 14 ! ! |
| ! ! ! ! ! 004-11 ! 16 ! ! |
| ! ! ! ! ! 004-11 ! 17 ! ! |
| ! ! ! ! ! 004-11 ! 18 ! ! |
| ! ! ! ! ! 004-11 ! 22 ! ! |
| ------------------------------------------------------------------------------- |
11. Messages Related to Engine Rating
A. Bump Function (Optional)
The bump function is activated with a switch located on the throttle control lever to increase the thrust of the engines. For each engine, the bump function is shown by a green "B" (bump) indication in the right part of the EPR dial.
The bump indication is:
The bump function is activated with a switch located on the throttle control lever to increase the thrust of the engines. For each engine, the bump function is shown by a green "B" (bump) indication in the right part of the EPR dial.
The bump indication is:
- Green:
* When the bump is detected as an engine level selection (engine is in operation)
* When the EEC is not in the backup mode
* When the EPR and the bump rating are valid. - Amber:
* When the bump is detected as an aircraft level selection (engine is in operation),
* When the EEC is not in the backup mode
* When the EPR and the bump rating are valid. - Cyan when the bump is detected as an aircraft level selection and the EEC is not in the backup mode.
B. Alpha Floor Function
The alpha floor function is activated in case of excessive angle of attack and consists in setting the engine thrust to TOGA configuration. The alpha floor function is generated by the Flight Augmentation Computer (FAC), a signal is transmitted to the DMC to display the "A FLOOR" message (in amber) in the upper part of the engine parameter area (Flight Control Unit (FCU) label 270 bit 23).
The alpha floor function is activated in case of excessive angle of attack and consists in setting the engine thrust to TOGA configuration. The alpha floor function is generated by the Flight Augmentation Computer (FAC), a signal is transmitted to the DMC to display the "A FLOOR" message (in amber) in the upper part of the engine parameter area (Flight Control Unit (FCU) label 270 bit 23).
C. Idle Indication
An "IDLE" green message is shown in the center upper part of the Engine/Warning Display (EWD) page when:
An "IDLE" green message is shown in the center upper part of the Engine/Warning Display (EWD) page when:
- The two engines are operated at minimum allowable power.
- The auto throttle option is activated.
- The aircraft is in flight condition.
NOTE: The condition considered here is:
- Aircraft in flight condition
Or - The ground FWC signal is valid and false (or the ground discrete is false).
12. Slats and Flaps Indications
The slats and flaps positions are displayed in the medium right part of the display as shown in the related figure.
The slats and flaps positions are displayed in the medium right part of the display as shown in the related figure.
A. Normal Operation
In clean configuration, a grey wing-shaped symbol is shown. When a position, different from the clean configuration is selected, a scale composed of white dots and of a flaps/slats indication appears. This scale features the different possible positions of the slats and the flaps. The actual position is indicated by green indexes moving in either direction as per the movement of the surfaces (extension or retraction).
The selected position is indicated by cyan indexes for the next target position of the slats and the flaps. At the same time, a cyan number gives the selected position in accordance with the reference numbers which are written on the flaps/slats control panel.
When the target position is reached, the cyan indexes disappear, the flaps/slats message comes into view in the white color and the number becomes green.
This number changes to the message "FULL" when the slats and the flaps are fully extended.
The table that follows gives the correspondence between the lever positions and the position in degrees of the surfaces for A320 and A321 aircraft equipped with IAE engines.
This shows in detail the progress of the indexes in a complete cycle in normal operation.
The sequence of the slats/flaps position indications is shown on the related figures.
In first extension from the clean configuration to the full one, and then from the full configuration to the clean one.
In clean configuration, a grey wing-shaped symbol is shown. When a position, different from the clean configuration is selected, a scale composed of white dots and of a flaps/slats indication appears. This scale features the different possible positions of the slats and the flaps. The actual position is indicated by green indexes moving in either direction as per the movement of the surfaces (extension or retraction).
The selected position is indicated by cyan indexes for the next target position of the slats and the flaps. At the same time, a cyan number gives the selected position in accordance with the reference numbers which are written on the flaps/slats control panel.
When the target position is reached, the cyan indexes disappear, the flaps/slats message comes into view in the white color and the number becomes green.
This number changes to the message "FULL" when the slats and the flaps are fully extended.
The table that follows gives the correspondence between the lever positions and the position in degrees of the surfaces for A320 and A321 aircraft equipped with IAE engines.
| ------------------------------------------------------------------------------- |
| ! Lever ! A318 ! A320 ! A321 ! Indication ! |
| ! Position !Slats!Flaps!Slats!Flaps!Slats!Flaps! ! |
| -----------!-----!-----!-----!-----!-----!-----!------------------------------! |
| ! 0 ! 0 ! 0 ! 0 ! 0 ! 0 ! 0 ! - ! |
| ! 1 ! 18 ! 10 ! 18 ! 10 ! 18 ! 10 ! 1 + F ! |
| ! 1 ! 18 ! 0 ! 18 ! 0 ! 18 ! 0 ! 1 - after auto retraction ! |
| ! 2 ! 22 ! 15 ! 22 ! 15 ! 22 ! 14 ! 2 ! |
| ! 3 ! 22 ! 20 ! 22 ! 20 ! 22 ! 21 ! 3 ! |
| ! FULL ! 27 ! 40 ! 27 ! 40 ! 27 ! 25 ! FULL ! |
| ------------------------------------------------------------------------------- |
This shows in detail the progress of the indexes in a complete cycle in normal operation.
The sequence of the slats/flaps position indications is shown on the related figures.
In first extension from the clean configuration to the full one, and then from the full configuration to the clean one.
B. Abnormal Operation
In case of slats or flaps jamming, the dedicated index color changes from green to amber. In addition, amber "S" or amber "F" indication appears, depending on the concerned surface.
When the stopping of the surfaces is due to the fact that the Wing Tip Brakes (WTBs) is applied (for example detection of an asymmetrical condition), the "S-LOCKED" or "F-LOCKED" message is displayed.
If the slats or flaps position information comes from the FWCs or the System Data Acquisition Concentrators (SDACs) is unavailable:
In case of slats or flaps jamming, the dedicated index color changes from green to amber. In addition, amber "S" or amber "F" indication appears, depending on the concerned surface.
When the stopping of the surfaces is due to the fact that the Wing Tip Brakes (WTBs) is applied (for example detection of an asymmetrical condition), the "S-LOCKED" or "F-LOCKED" message is displayed.
If the slats or flaps position information comes from the FWCs or the System Data Acquisition Concentrators (SDACs) is unavailable:
- An amber "S" or "F" indication appears.
- An amber "XX" indication is shown below the S or F indication, depending on the concerned surface.
- The related scale (part related to the slats or the flaps) goes out of view.
C. Slats and Flaps Parameter Definition
| ------------------------------------------------------------------------ |
| ! Parameter ! Mnemonic ! Equipment ! Label ! Bit ! Color ! |
| -------!-----------------!----------!--------------!--------!------!----------! |
| ! 1 ! Slat position ! SLSLTPOS ! FWC ! 127-11 ! ! White ! |
| ! ! (left) ! ! ! ! ! ! |
| ! ! Slat position ! SRSLTPOS ! FWC ! 127-00 ! ! White ! |
| ! ! (right) ! ! ! ! ! ! |
| ! ! Slat position ! SSLTSP1 ! SDAC ! 127-01 ! ! White ! |
| ! ! Slat position ! SSLTSP2 ! SDAC ! 127-10 ! ! White ! |
| !------!-----------------!----------!--------------!--------!------!----------! |
| ! 2 ! Flap position ! SLFLPPOS ! FWC ! 137-11 ! ! White ! |
| ! ! (left) ! ! ! ! ! ! |
| ! ! Flap position ! SRFLPPOS ! FWC ! 137-00 ! ! White ! |
| ! ! (right) ! ! ! ! ! ! |
| ! ! Flap position ! SFLPSP1 ! SDAC ! 137-01 ! ! White ! |
| ! ! Flap position ! SFLPSP1 ! SDAC ! 137-10 ! ! White ! |
| !------!-----------------!----------!--------------!--------!------!----------! |
| ! 3 ! Flap selection ! SS0F0 ! SDAC ! 046.XX ! 17 ! Cyan ! |
| ! ! Flap selection ! SS18F10 ! SDAC ! 046.XX ! 18 ! Cyan ! |
| ! ! Auto retraction ! SS18F0 ! SDAC ! 046.XX ! 26 ! Cyan ! |
| ! ! Flap selection ! SS22F15 ! SDAC ! 046.XX ! 19 ! Cyan ! |
| ! ! Flap selection ! SS22F20 ! SDAC ! 046.XX ! 20 ! Cyan ! |
| ! ! Flap selection ! SS22F40 ! SDAC ! 046.XX ! 21 ! Cyan ! |
| ------------------------------------------------------------------------------- |
D. Other Parameters
| ------------------------------------------------------------------------ |
| ! Parameter ! Mnemonic ! Equipment ! Label ! Bit ! Color ! |
| -------!-------------------!------------!------------!--------!------!--------! |
| ! 1 ! SLAT SYS JAM ! SSLTSJ.1 ! SDAC ! 046-01 ! 13 ! Amber ! |
| ! ! SLAT SYS JAM ! SSLTSJ.2 ! SDAC ! 046-10 ! 13 ! Amber ! |
| ! ! SLAT WTB ENGGD !SSLTWTBENG.1! SDAC ! 046-01 ! 15 ! Amber ! |
| ! ! SLAT WTB ENGGD !SSLTWTBENG.2! SDAC ! 046-10 ! 15 ! Amber ! |
| !------!-------------------!------------!------------!--------!------!--------! |
| ! 2 ! FLAP SYS JAM ! SFLPSJ.1 ! SDAC ! 046-01 ! 14 ! Amber ! |
| ! ! FLAP SYS JAM ! SFLPSJ.2 ! SDAC ! 046-10 ! 14 ! Amber ! |
| ! ! FLAP WTB ENGGD !SFLPWTBENG.1! SDAC ! 046-01 ! 16 ! Amber ! |
| ! ! FLAP WTB ENGGD !SFLPWTBENG.2! SDAC ! 046-10 ! 16 ! Amber ! |
| !------!-------------------!------------!------------!--------!------!--------! |
| ! 3 ! SLAT WTB ENGGD !SSLTWTBENG.1! SDAC ! 046-01 ! 15 ! Amber ! |
| ! ! SLAT WTB ENGGD !SSLTWTBENG.2! SDAC ! 046-10 ! 15 ! Amber ! |
| ! ! SLATALPHALOCKENGGD! SSALKENG.1 ! SDAC ! 046-01 ! 24 ! Amber ! |
| ! ! SLATALPHALOCKENGGD! SSALKENG.2 ! SDAC ! 046-10 ! 24 ! Amber ! |
| ! ! FLAP WTB ENGGD !SFLPWTBENG.1! SDAC ! 046-01 ! 16 ! Amber ! |
| ------------------------------------------------------------------------ |
| ! Parameter ! Mnemonic ! Equipment ! Label ! Bit ! Color ! |
| -------!-------------------!------------!------------!--------!------!--------! |
| ! ! FLAP WTB ENGGD !SFLPWTBENG.2! SDAC ! 046-10 ! 16 ! Amber ! |
| !------!-------------------!------------!------------!--------!------!--------! |
| ! ! FLAP SYS 1 FAULT ! SFLPS1F ! SDAC ! 004-01 ! 15 ! ! |
| ! ! FLAP SYS 2 FAULT ! SFLPS2F ! SDAC ! 004-10 ! 15 ! ! |
| ! ! FLAP SYS 1 FAULT ! SSLTS1F ! SDAC ! 004-01 ! 14 ! ! |
| ! ! FLAP SYS 2 FAULT ! SSLTS2F ! SDAC ! 004-10 ! 14 ! ! |
| !------!-------------------!------------!------------!--------!------!--------! |
| ! ! FLAPS FAULT ! WWFLF ! FWC ! 126-00 ! 14 ! ! |
| ! ! SLATS FAULT ! WWSFL ! FWC ! 126-00 ! 13 ! ! |
| ------------------------------------------------------------------------ |
| ! Parameter ! Mnemonic ! Equipment ! Label ! Bit ! Color ! |
| -------!-------------------!------------!------------!--------!------!--------! |
| ! !FLAP DATA NOT VALID! SFLPDNV.1 ! SDAC ! 046-01 ! 29 ! Amber ! |
| ! !FLAP DATA NOT VALID! SFLPDNV.2 ! SDAC ! 046-10 ! 29 ! Amber ! |
13. Warning and Memo Section
The lower part of the upper ECAM DU is dedicated to the display of the warning and memo messages.
The lower part of the upper ECAM DU is dedicated to the display of the warning and memo messages.
A. Operation
The lower part of the display provides the pilot with either the warning/caution or memo messages. Special memos or check-list as the landing memo or the takeoff memo are provided on this display.
At last, the special messages such as "STS", "ADV" or overflow arrow can also be displayed.
The description that follows explains in general the partitioning and the use of the different zones. The detailed description and animation of the various texts (which are delivered by the FWC) for the display on the upper ECAM DU, are given in the chapter 315100.
The lower part of the display provides the pilot with either the warning/caution or memo messages. Special memos or check-list as the landing memo or the takeoff memo are provided on this display.
At last, the special messages such as "STS", "ADV" or overflow arrow can also be displayed.
The description that follows explains in general the partitioning and the use of the different zones. The detailed description and animation of the various texts (which are delivered by the FWC) for the display on the upper ECAM DU, are given in the chapter 315100.
B. Partitioning
The lower part is divided into two zones separated by a grey stripe. The left zone contains 8 lines of 27 characters whereas the right one contains 8 lines of 14 characters.
The lower part is divided into two zones separated by a grey stripe. The left zone contains 8 lines of 27 characters whereas the right one contains 8 lines of 14 characters.
C. Warning Messages
The warning messages are displayed first in the left zone and have priority on the left memo messages. If the number of lines of the whole text of the warning/caution messages exceeds 8, the titles of the not shown failures and the secondary failures are written in the right zone (they have priority over the right memo messages displayed).
The warning messages are displayed first in the left zone and have priority on the left memo messages. If the number of lines of the whole text of the warning/caution messages exceeds 8, the titles of the not shown failures and the secondary failures are written in the right zone (they have priority over the right memo messages displayed).
D. Overflow Indication
When the text of the warning/caution messages exceeds the capacity of the display (8 lines), an overflow arrow appears below the grey stripe. This arrow concerns only the warning messages and does not deal with the memo messages.
This arrow remains displayed on the screen as long as there are texts still waiting for the display.
When the text of the warning/caution messages exceeds the capacity of the display (8 lines), an overflow arrow appears below the grey stripe. This arrow concerns only the warning messages and does not deal with the memo messages.
This arrow remains displayed on the screen as long as there are texts still waiting for the display.
E. Memo Messages
The memo messages are shared in two lists (left and the right parts). They are displayed when no warnings/caution messages are presented. As previously mentioned, the memo messages can be either the aircraft system functions which are selected (LDG LT,...) or the special check-lists (like the take-off memo or the landing memo).
The memo messages are shared in two lists (left and the right parts). They are displayed when no warnings/caution messages are presented. As previously mentioned, the memo messages can be either the aircraft system functions which are selected (LDG LT,...) or the special check-lists (like the take-off memo or the landing memo).
F. "STS" and 'ADV" Messages
In Addition to the overflow indication, two attention symbols may appear on the display:
In Addition to the overflow indication, two attention symbols may appear on the display:
- STS indication:
It appears below the grey stripe at the same location as the overflow arrow provided that this one is away. This message indicates to the pilot that the status page is no more empty. - ADV indication:
It appears in normal and single display configuration to indicate the pilot that a parameter drifts in an aircraft system. As the related system page cannot be displayed on the lower ECAM DU, the pilot has to find the information on the ECAM control panel (the associated P/BSW flashes to indicate which system is concerned).
14. Acquisition and Wiring
A. EEC (FADEC System)
Each EEC issues 4 output buses which always convey the same data 2 by 2. Each EEC is fully redundant. In case of failure of channel A, channel B takes over.
Each DMC receives and processes one 'A' bus and one 'B' bus from each of the engine EEC.
The DMCs take the needed parameters preferably on the bus related to the channel in control (label 270, bit 24).
If a parameter is invalid on one bus, the DMC takes it on the other bus. If this parameter is not available on bus 'A' and bus 'B', the related indication is either flagged (XX) or cleared, as per the nature of the parameter.
Each EEC issues 4 output buses which always convey the same data 2 by 2. Each EEC is fully redundant. In case of failure of channel A, channel B takes over.
Each DMC receives and processes one 'A' bus and one 'B' bus from each of the engine EEC.
The DMCs take the needed parameters preferably on the bus related to the channel in control (label 270, bit 24).
If a parameter is invalid on one bus, the DMC takes it on the other bus. If this parameter is not available on bus 'A' and bus 'B', the related indication is either flagged (XX) or cleared, as per the nature of the parameter.
NOTE: There is no EEC valid signal. Each parameter is considered separately.
B. Fuel Quantity Indicator (FQI)
The FQI issues 4 buses:
The FQI issues 4 buses:
- FQI-1A FQI-1A, 1B, 2A, 2B.
- FQI-1B
- FQI-2A
- FQI-2B.
DMC1 acquires 1A and 2A.
DMC3 acquires 1A and 2B.
DMC2 acquires 1B and 2B.
Each DMC uses preferably the FQI-1 (A or B) bus parameters.
If the FQIS CHANNEL SUPERIORITY signal (label 276 bit 13) requests the switching to the FQI-2 bus, the DMC switches to this FQI-2 bus.
However, the DMC uses a given FQI-X bus only if this bus is valid.
A given FQI-X bus is valid only if all the parameters used by the DMC are valid.
If the FQI-1 and 2 buses are invalid, the DMC switches permanently from one to the other until it finds a valid one. Meanwhile the fuel quantity parameters are flagged (XX), on the ECAM EWD display.