Permanent noise from the cockpit loudspeaker(s)

TASK 34-55-00-810-842-A
Permanent noise from the cockpit loudspeaker(s)

1. Possible Causes

RECEIVER-VOR/MKR, 1 [3RS1]
wiring of the VOR1 AUDIO bus from the AMU (1RN) to the VOR/MKR receiver 1 (3RS1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-55-00-740-002	BITE Test of the VOR/MKR
ASM 345501
AMM 34-55-31-000-001	Removal of the VOR/MKR Receiver
AMM 34-55-31-400-001	Installation of the VOR/MKR Receiver

3. Fault Confirmation
Subtask 34-55-00-700-052-A

A. Test
Not applicable, the fault is evident.

4. Fault Isolation
Subtask 34-55-00-810-101-A

A. If there is the noise:

(1) If the fault continues:

do a check and repair the wiring of the VOR1 AUDIO bus from the AMU (1RN) to the VOR/MKR receiver 1 (3RS1) ASM 345501.

Subtask 34-55-00-740-104-A

B. Do the BITE test of the VOR/MKR AMM 34-55-00-740-002.

[Rev.8 from Aug 2018] 2026.04.04 04:38:58 UTC