Loss of the ILS2 Audio Signal from the ground station

TASK 34-36-00-810-831-A
Loss of the ILS2 Audio Signal from the ground station

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-51-34-000-001	Removal of the Audio Management Unit (AMU) (1RN)
AMM 23-51-34-400-001	Installation of the Audio Management Unit (AMU) (1RN)
AMM 34-36-00-710-003	Operational Test of the ILS
ASM 343601
AMM 34-36-31-000-001	Removal of the ILS Receiver
AMM 34-36-31-400-001	Installation of the ILS Receiver

3. Fault Confirmation
Subtask 34-36-00-710-066-B

A. Do the operational test of the ILS AMM 34-36-00-710-003.

4. Fault Isolation
Subtask 34-36-00-865-066-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	NAV/MMR/1	42RT1	G12
** ON A/C NOT FOR ALL
49VU	NAV/ILS/1	1RT1	G12

Subtask 34-36-00-810-084-B

B. If there is no identification signal on the loud speakers with the circuit breaker 42RT1 open:

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring of the AUDIO OUTPUT bus from the MMR-2 (40RT2) to the AMU (1RN) ASM 343601.

Subtask 34-36-00-710-067-A

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:00 UTC