Loss of the ATC1 Data to the TCAS

TASK 34-43-00-810-820-A
Loss of the ATC1 Data to the TCAS

1. Possible Causes

XPDR-ATC/MODE S, 1 [1SH1]
CMPTR-TCAS [1SG]
wiring of the XT COORD-1 bus from the ATC/MODE S transponder 1 (1SH1) to the TCAS computer (1SG)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-43-00-740-001	BITE Test of the TCAS
ASM 344301
AMM 34-43-34-000-001	Removal of the TCAS Computer
AMM 34-43-34-400-001	Installation of the TCAS Computer
AMM 34-52-33-000-001	Removal of the ATC/Mode S Transponder
AMM 34-52-33-400-001	Installation of the ATC/Mode S Transponder

3. Fault Confirmation
Subtask 34-43-00-740-082-A

A. Test
(1) Do the BITE test of the TCAS AMM 34-43-00-740-001.

4. Fault Isolation
Subtask 34-43-00-810-070-A

A. If the test gives the maintenance message ATC1 (1SH1)/TCAS (1SG):

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring of the XT COORD-1 bus from the ATC/MODE S transponder 1 (1SH1) to the TCAS computer (1SG): from pins AA/5G, 5H to pins AE/14F, 14G ASM 344301.

Subtask 34-43-00-740-083-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:13 UTC