Permanent noise from the cockpit loudspeaker(s)

TASK 34-48-00-810-850-A
Permanent noise from the cockpit loudspeaker(s)

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-48-00-710-001	Operational Test of GPWS Ground Self-test Function
ASM 344801
AMM 34-48-34-000-001	Removal of the GPWC
AMM 34-48-34-400-001	Installation of the GPWC

3. Fault Confirmation
Subtask 34-48-00-700-050-A

A. Test
Not applicable, the fault is evident.

4. Fault Isolation
Subtask 34-48-00-810-114-A

A. If there is the noise:

(1) If the fault continues:

do a check and repair the wiring of the AUDIO OUTPUT bus from the GPWC (1WZ) to the first terminal block ASM 344801.

Subtask 34-48-00-710-079-A

B. Do the operational test of Enhanced GPWS ground self-test function AMM 34-48-00-710-001.

[Rev.8 from Aug 2018] 2026.04.04 04:33:18 UTC