R TRAFFIC COLLISION AVOIDANCE SYSTEM (TCAS) - FAULT ISOLATION PROCEDURES
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TASK 34-43-00-810-801
Failure of the TCAS Computer
1. Possible Causes
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- CMPTR-TCAS (1SG)
- ANTENNA-TCAS, TOP (7SG1)
- ANTENNA-TCAS, BOTTOM (7SG2)
- coaxial cables from the antennas (7SG1) and (7SG2) to the TCAS computer (1SG)
- DATA LOADER RECEPTACLE (194VC)
- short to ground at the wiring between the circuit breaker (4SG) and the two units (1SG, 194VC)
- C/B-NAV/TCAS
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 34-43-00-740-001 BITE Test of the TCAS
AMM 34-43-11-000-001 Removal of the TCAS Antenna (7SG1, 7SG2)
AMM 34-43-11-400-001 Installation of the TCAS Antenna (7SG1, 7SG2)
AMM 34-43-34-000-001 Removal of the TCAS Computer (1SG)
AMM 34-43-34-400-001 Installation of the TCAS Computer (1SG)
ASM 34-43/01
3. Fault Confirmation
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A. Make sure that this(these) circuit breaker(s) is(are) closed:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU COM NAV/TCAS 4SG K10
B. Test
(1) If the circuit breaker (4SG) trips, refer to Para. 4. C. of this trouble shooting procedure.
(2) Do the BITE test of the TCAS (Ref. AMM TASK 34-43-00-740-001).
- If the BITE test is not possible, refer to Para. 4. B. of this trouble shooting procedure.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞34-43-00∞∞∞∞∞∞∞∞∞∞Page 201
May 01/05 CES
4. Fault Isolation
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**ON A/C 001-049, 051-099, 101-105, 151-199,
A. If the circuit breaker (4SG) is closed, and if the BITE test gives the maintenance message TCAS (1SG):
- replace the CMPTR-TCAS (1SG) (Ref. AMM TASK 34-43-34-000-001) and (Ref. AMM TASK 34-43-34-400-001).
R **ON A/C 106-149, 201-299, 301-399, 401-499,
A. If the circuit breaker (4SG) is closed, and if the BITE test gives the maintenance message TCAS (1SG):
(1) On the MCDU, on the TCAS menu page, push the line key adjacent to the TROUBLE SHOOT DATA indication to get the TCAS TROUBLE SHOOTING DATA (TSD) page.
(a) If the TSD page does not give the message CABLE CALIBRATION:
- replace the CMPTR-TCAS (1SG) (Ref. AMM TASK 34-43-34-000-001) and (Ref. AMM TASK 34-43-34-400-001).
(b) If the TSD page gives the message CABLE CALIBRATION:
1 Visually examine the antennas (7SG1) and (7SG2) and their
_ connectors for signs of corrosion or water.
2 Do a check of the coaxial cables from the antennas (7SG1) and
_ (7SG2) to the TCAS computer (1SG) (Ref. ASM 34-43/01).
a If there is no continuity, repair the related coaxial
_
cable.
- if the fault continues, replace the related antenna ANTENNA-TCAS, TOP (7SG1) or ANTENNA-TCAS, BOTTOM (7SG2) (Ref. AMM TASK 34-43-11-000-001) and (Ref. AMM TASK 34-43-11-400-001).
b If there is continuity and if there are no signs of
_ corrosion or water:
- replace the CMPTR-TCAS (1SG) (Ref. AMM TASK 34-43-34-000-001) and (Ref. AMM TASK 34-43-34-400-001).
R **ON A/C ALL
B. If the circuit breaker (4SG) is closed and if the BITE test is not possible
- do a check for 115VAC at pin AC/1 of the TCAS.
(1) If there is no 115VAC:
- do a check of the wiring of the 115VAC signal from circuit breaker (4SG) to TCAS computer (1SG) (Ref. ASM 34-43/01). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 导航 NAVIGATION 3(50)
