Loss of the ATC Top Antenna 1 Signals

TASK 34-52-00-810-804-A
Loss of the ATC Top Antenna 1 Signals

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-52-00-740-004	BITE Test of the ATC
ASM 345201
AMM 34-52-11-000-001	Removal of the ATC Antenna
AMM 34-52-11-400-001	Installation of the ATC Antenna
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 34-52-00-740-056-A

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

4. Fault Isolation
Subtask 34-52-00-810-055-B

A. If the BITE test gives the maintenance message ATC1 TOP ANTENNA (7SH3) :

(1) If the fault continues:

do a check of the wiring from the ATC/MODE S transponder 1 (1SH1) to the ATC top antenna 1 (7SH3) ASM 345201.

(a) If there is no continuity:

(b) If there is continuity:

Subtask 34-52-00-740-057-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:22 UTC