TRAFFIC AND TERRAIN INTEGRATED SURVEILLANCE SYSTEM (T/TISS) - DESCRIPTION AND OPERATION

** ON A/C NOT FOR ALL

1. General
The Traffic and Terrain Integrated Surveillance System (T/TISS) is a combination of three functions in a single Line Replaceable Unit (LRU). These functions are Traffic alert and Collision Avoidance System (TCAS) (TCAS II Change 7.1) with Airborne Traffic Situation Awareness (ATSAW) capability , Terrain Awareness and Warning System (TAWS) and ATC/Mode S transponder compliante with DO-260B and DO-181E.
The general purpose of the T/TISS is to alert the crew of two kinds of hazards which are:

Collision with terrain (Controlled Flight Into Terrain)
Collision with surrounding traffic.

The T/TISS:

Detects the hazards
Alerts the crew if the hazard is imminent
Informs the crew of the aircraft environment
When possible, proposes escape maneuvers
Provides Mode S transponder functions, including Elementary Surveillance (ELS), Enhanced Surveillance (EHS) and Automatic Dependant Surveillance-Broadcast (ADS-B OUT).

To do this, the system receives different aircraft parameters, applies alerting algorithms and provides the flight crew with aural and visual alerts and displays.
In this document, "T/TISS-TCAS" is used to define the TCAS function, "T/TISS-TAWS" is used to define the TAWS function and "T/TISS-ATC2" is used to define the ATC function.
The full configuration contains a single T/TISS (using its own pair of antennas, for both TCAS and embedded transponder) and a standalone legacy transponder (using its own pair of antennas).

T/TISS - TAWS/TCAS Configuration ** ON A/C NOT FOR ALL

NOTE: Antennas previously used by XPDR2 in federated architecture are now un-used in this configuration.

All cockpit hardware interfaces (lights, pushbutton switches) for the T/TISS-TAWS remain identical to the Enhanced Ground Proximity Warning System (Enhanced GPWS). Only the audio messages and Navigation Display (ND) interface are different. All EGPWS Inputs/Outputs (I/O) are conveyed to the T/TISS as well as a few dedicated T/TISS-TAWS inputs (slat/flap control lever position from Slat Flap Control Computer 1 (SFCC1) and engine out information from the Flight Management and Guidance Computer 1 (FMGC1)). There has been no change on the TAWS peripheral systems (in particular the Flight Warning Computer (FWC), Display Management Computer (DMC), Centralized Fault Display Interface Unit (CFDIU) and Flight Data Interface and Management Unit (FDIMU)).

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2. Component Location

T/TISS - Component Location 1/2 ** ON A/C NOT FOR ALL

T/TISS - Component Location 2/2 ** ON A/C NOT FOR ALL

A. General

FIN	FUNCTIONAL DESIGNATION	PANEL	ZONE	ATA REF
** ON A/C NOT FOR ALL
1000SG	CMPTR-T/TISS	82 VU	128	34-72-34
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1000SG	CMPTR-T/TISS	82VU	128	34-72-34

B. TCAS Part

FIN	FUNCTIONAL DESIGNATION	PANEL	ZONE	ATA REF
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3SH	CTL UNIT-ATC/TCAS	11VU	210	34-52-12
7SG1	ANTENNA-TCAS, TOP		230	34-43-11
7SG2	ANTENNA-TCAS, BOTTOM		130	34-43-11
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105SG1	SW-TRAFFIC SELECTOR, CAPT	301VU	211	34-43-00
105SG2	SW-TRAFFIC SELECTOR, F/O	500VU	212	34-43-00

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3. System Description

A. TCAS Function
See 34-72-10 (T/TISS-TCAS section)

B. TAWS Function
See 34-72-20 (T/TISS-TAWS section)

C. ATC Function
See 34-72-30 (T/TISS-ATC2 section)

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4. Power Supply

A. Circuit Breakers Table

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	TCAS/TAWS	1004SG	K10
121VU	TCAS	1006SG	L01
121VU	T/TISS	2004SG	K07
121VU	EIS/GPWS/28VDC	2WZ	P06
49VU	COM NAV/ATC/1	5SH1	G11
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122VU	ATSAW// CAPT// SEL & RLY	17SG1	T08
122VU	ATSAW// F/O// SEL & RLY	17SG2	T09

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5. Interface

A. General
T/TISS is connected to various systems in input and/or output using:

ARINC 429 signals
ARINC 453 signals
Discrete signals
RF signals
Ethernet signals
Analog signals.

B. Configuration

(1) Full configuration
In this configuration, T/TISS can replace either:

TCAS + EGPWS + ATC2 or
T2CAS and ATC2.

The following figures show overall schematics of the T/TISS input/output connections.

T/TISS - Input Buses ** ON A/C NOT FOR ALL

T/TISS - Output Buses and Display Interfaces ** ON A/C NOT FOR ALL

T/TISS - Input Discretes ** ON A/C NOT FOR ALL

T/TISS - Output Discretes ** ON A/C NOT FOR ALL

C. Pin Programming Interface

(1) TAWS pin programming
Configuration of T/TISS-TAWS operational software is achieved through hardware pin-programming:

Aircraft Type
Audio Menu Selection (JAA/FAA)
CRT-LCD Display Select (EIS1/EIS2)
Automatic T/TISS-TAWS (CPA-THD/OCPA-OHD) Deactivation
CPA/OCPA - THD/OHD function activation
Predictive Windshear Present
Alternate Altitude Source Selection (GPS)
Lateral Position Priority (GPS)
Hybrid GPS (GPIR) Architecture
Cold Temperature Compensation
GPS Autonomous Architecture (GPSSU/MMR)
Eleview
Obstacle.

(2) TCAS pin programming

Aircraft Altitude Limit
Display all traffic
TA/RA Display Intruder
RA valid disable
Audio level selec.

(3) XPDR pin programming

Mode S address
Maximum Cruising true Airspeed
SDI.

(4) TAWS pin programming
Configuration of T/TISS-TAWS operational software is achieved through hardware pin-programming:

Aircraft Type
Audio Menu Selection (JAA/FAA)
CRT-LCD Display Select (EIS1/EIS2)
Automatic T/TISS-TAWS (CPA-THD/OCPA-OHD) Deactivation
CPA/OCPA - THD/OHD function activation
Predictive Windshear Present
Alternate Altitude Source Selection (GPS)
Lateral Position Priority (GPS)
Hybrid GPS (GPIR) Architecture
Cold Temperature Compensation
GPS Autonomous Architecture (GPSSU/MMR)
Eleview
Obstacle.

(5) TCAS pin programming

Aircraft Altitude Limit
Display all traffic
TA/RA Display Intruder
RA valid disable
Audio level selec.

(6) XPDR pin programming

Mode S address
Maximum Cruising true Airspeed
SDI.

(7) ATSAW pin programming

DTIF Enable
ADS-B Failure Mode
Traffic Simulation Enable
True/Magnetic Heading Setting
ITP Activation
CAVS Activation (provision)
Sequencing and Merging Activation (provision)
ATSA-SURF Activation (provision)

D. Software Configuration Follow-up

(1) A compact flash interface is available on the computer for the software data loading.

(2) The software parts of T/TISS that follow are dataloadable:

TCAS and ATSAW software
Transponder software
TAWS software
AAA Database (DB)
Terrain DB (separately loadable)
Obstacle DB (separately loadable).

The LRU identification menus show each downloaded software version-reference.
The Cyclic Redundancy Checks (CRC) examine each downloaded part of the code and do not let the T/TISS use the corrupted software.

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6. Component Description

A. External Description FIN: 1000-SG

T/TISS Computer ** ON A/C NOT FOR ALL

The T/TISS computer is packaged in a 6 MCU box in compliance with ARINC 600 standard.
The Light Emitting Diodes (LED) on the front panel, as shown in the figure that follows, show the status of the T/TISS:

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

! NAME ! COLORS ! ASSOCIATED FAULTS !

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

! T3CAS P/F STATUS ! Green/Red ! Green = Internal Pass !

! ! ! Red = Internal Fail !

! ! ! Red Blink = Internal Fail within Boot !

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

! DATA STATUS ! Green/Amber ! Green Solid = Reading !

! ! ! Green Blink = Transfer/Programming !

! ! ! Green Solid = Load Success !

! ! ! Amber = Load Fail !

! ! ! Amber Blink = Bad Media/Config Fail !

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

! APM STATUS ! Green/Amber ! Not applicable !

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

! TOP ANT ! Green/Amber ! Green = External Pass !

! ! ! Amber = External Fail !

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

! BOT ANT ! Green/Amber ! Green = External Pass !

! ! ! Amber = External Fail !

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

! EXTERNAL IO ! Green/Amber ! Green = External Pass !

! STATUS ! ! Amber = External Fail !

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

NOTE: Data loading is permitted only through application of Airbus Service Bulletin or Vendor Service Bulletin.

B. Internal Description FIN: 1000-SG
The T/TISS computer consists of the major subassemblies shown in Figure.

T/TISS - Block Diagram ** ON A/C NOT FOR ALL

(1) Rear Interconnect Assembly (A1)
The A1 Interconnect circuit card assembly provides the interconnection between:

Rear ARINC 600 connector
Common Processor Assembly A2
RF Transmitter Assembly A3
Common Power Supply Assembly A4
RF Receiver Assembly A5

(2) Common Processor Assembly (A2)
The Common Processor Assembly contains three MPC8245 processors, memory devices and logic circuits, aircraft interface circuits, and FPGA devices for processing and controlling the RF functions. Interfaces include ARINC/429 receivers and transmitters, discrete IO, audio, compact flash, and Ethernet.

(3) RF Transmitter Assembly (A3)
The RF Transmitter Assembly contains an L-band LDMOS amplifier lineup for transmitting 1030 MHz interrogations and 1090 MHz replies. It also contains transmit/receive antenna switching, RF self test, RF combiner, and RF power detection circuitry.

(4) Common Power Supply Assembly (A4)
The Common Power Supply Assembly provides regulated power to the T/TISS from external aircraft power inputs (+28VDC or 115VAC).

(5) RF Receiver Assembly (A5)
The RF Receiver Assembly contains four matched receivers for reception of 1090 MHz transponder replies, including RF and IF gain controls. There are eight receivers and logarithmic amplifiers for listening to 1030 MHz transponder interrogations. In addition,there is a separate circuit for multiplexing the Mode S DPSK signal. The assembly also contains transmit/receive antenna switching and RF self test circuitry.

** ON A/C NOT FOR ALL

7. Operation/Control and Indicating

A. Priority Management

(1) Priority management at aircraft level
The same philosophy as for other TAWS installation is used. Various alerts can be generated to warn the crew about external threat (such as windshear phenomenon) or threats relative to the aircraft condition (such as low energy warning). These alerts consist of aural messages broadcast through the loudspeakers associated - when applicable - with visual information displayed on the NDs and/or the PFDs.
An alert priority management is performed:

by the DMCs for alert display on NDs and/or PFDs
by specific discrete wiring which links inhibition outputs to inhibition inputs (FWC, WXR, GPWC and TCAS computers) for audio prioritization
by T/TISS-TAWS through dedicated discrete for WXR and terrain display priority management.

These are the alert priority levels from the highest to the lowest one:

STALL
RWS
PWS
GPWS (TAWS)
TCAS/low energy warning (same level)
Auto callout.

When TCAS is inhibited by a higher priority alert, the TA mode is selected and voice announcement is cancelled.

(2) T/TISS internal priority management

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

!Priority! Alert Title ! Audio !

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

! 1 ! PULL UP (mode 1) ! PULL UP !

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

! 2 ! TERRAIN (mode 2A preface)! TERRAIN - TERRAIN !

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

! 2 ! TERRAIN-PULL UP (mode 2) ! PULL UP !

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

! 3 ! Avoid Terrain ! AVOID TERRAIN !

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

! 4 ! Avoid Obstacle ! AVOID OBSTACLE !

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

! 5 ! TERRAIN-PULL UP ! TERRAIN AHEAD PULL UP (JAA) / !

! ! (not closure) ! TERRAIN TERRAIN PULL UP (FAA) !

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

! 6 ! Obstacle awareness ! OBSTACLE AHEAD PULL UP (JAA) / !

! ! PULL UP ! OBSTACLE TERRAIN PULL UP (FAA) !

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

! 7 ! TERRAIN (Caution mode 2) ! TERRAIN !

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

! 8 ! Terrain awareness caution! TERRAIN AHEAD - TERRAIN AHEAD (JAA) / !

! ! ! CAUTION TERRAIN - CAUTION TERRAIN (FAA) !

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

! 9 ! Obstacle awareness ! OBSTACLE AHEAD - OBSTACLE AHEAD (JAA) !

! ! caution ! CAUTION OBSTACLE - CAUTION OBSTACLE (FAA!

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

! 10 ! TOO LOW TERRAIN (mode 4) ! TOO LOW TERRAIN !

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

! 11 ! TOO LOW TERRAIN (caution)! TOO LOW TERRAIN !

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

! 12 ! TOO LOW GEAR (mode 4) ! TOO LOW GEAR !

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

! 13 ! TOO LOW FLAP (mode 4) ! TOO LOW FLAP !

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

! 14 ! SINK RATE (mode 1) ! SINK RATE - SINK RATE !

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

! 15 ! DON'T SINK (mode 3) ! DON'T SINK - DON'T SINK !

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

! 16 ! GLIDE SLOPE (mode 5) ! GLIDE SLOPE !

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

! 17 ! TCAS RA ! CLIMB - CLIMB !

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

! 17 ! TCAS RA ! CLIMB, CROSSING CLIMB !

! ! ! CLIMB, CROSSING CLIMB !

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

! 17 ! TCAS RA ! INCREASE CLIMB - INCREASE CLIMB !

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

! 17 ! TCAS RA ! CLIMB, CLIMB NOW - CLIMB, CLIMB NOW !

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

! 17 ! TCAS RA ! DESCEND - DESCEND !

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

! 17 ! TCAS RA ! DESCEND, CROSSING DESCEND !

! ! ! DESCEND, CROSSING DESCEND !

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

! 17 ! TCAS RA ! INCREASE DESCEND - INCREASE DESCEND !

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

! 17 ! TCAS RA ! DESCEND, DESCEND NOW !

! ! ! DESCEND, DESCEND NOW !

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

! 17 ! TCAS RA ! LEVEL OFF - LEVEL OFF !

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

! 17 ! TCAS RA ! MONITOR VERTICAL SPEED !

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

! 17 ! TCAS RA ! MAINTAIN VERTICAL SPEED, MAINTAIN !

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

! 17 ! TCAS RA ! MAINTAIN VERTICAL SPEED, CROSSING !

! ! ! MAINTAIN !

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

! 17 ! TCAS RA ! CLEAR OF CONFLICT !

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

! 18 ! TCAS RA ! TRAFFIC - TRAFFIC !

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

[Rev.10 from 2021] 2026.04.02 06:23:35 UTC