Loss of the Control Source Data to the ATC/MODE S Transponder 1

TASK 34-52-00-810-811-A
Loss of the Control Source Data to the ATC/MODE S Transponder 1

1. Possible Causes

CTL UNIT-ATC/TCAS [3SH]
XPDR-ATC/MODE S, 1 [1SH1]
wiring of the CONTROL DATA bus from the ATC control unit (3SH) to the ATC/MODE S transponder 1 (1SH1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-52-00-740-004	BITE Test of the ATC
ASM 345201
AMM 34-52-12-000-001	Removal of the ATC/TCAS Control Unit
AMM 34-52-12-400-001	Installation of the ATC/TCAS Control Unit
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 34-52-00-740-070-A

A. Test
(1) Do the BITE test of the ATC AMM 34-52-00-740-004.

4. Fault Isolation
Subtask 34-52-00-810-062-C

A. If the BITE test gives the maintenance message ATC CTL PNL(3SH)/ATC1(1SH1) :

(1) If the fault continues:

(a) If the fault continues:

do a check and repair the wiring of the CONTROL DATA bus from the ATC control unit (3SH) to the ATC/MODE S transponder 1 (1SH1) ASM 345201.

Subtask 34-52-00-740-071-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:23 UTC