Permanent noise from the cockpit loudspeaker(s)

TASK 34-51-00-810-836-A
Permanent noise from the cockpit loudspeaker(s)

1. Possible Causes

INTRG-DME, 1 [2SD1]
wiring of the DME 1 AUDIO bus from the AMU (1RN) to the DME interrogator 1 (2SD1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-51-00-740-002	BITE Test of the DME
ASM 345101
AMM 34-51-33-000-001	Removal of the DME Interrogator
AMM 34-51-33-400-001	Installation of the DME Interrogator

3. Fault Confirmation
Subtask 34-51-00-700-050-A

A. Test
Not applicable, the fault is evident.

4. Fault Isolation
Subtask 34-51-00-810-097-A

A. If there is the noise:

(1) If the fault continues:

do a check and repair the wiring of the DME 1 AUDIO bus from the AMU (1RN) to the DME interrogator 1 (2SD1) ASM 345101.

Subtask 34-51-00-740-106-A

B. Do the BITE test of the DME (system 1) AMM 34-51-00-740-002.

[Rev.8 from Aug 2018] 2026.04.04 04:33:21 UTC