Loss of the AUDIO 3XFRD Indication after the AUDIO SWITCHING Selector Switch is set to F/O/3

TASK 23-51-00-810-845-A
Loss of the AUDIO 3XFRD Indication after the AUDIO SWITCHING Selector Switch is set to F/O/3

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-51-00-710-003	Operational Test of the CAPT and F/O ACPs Switching to the 3rd OCCUPANT ACP
ASM 235104
AIPC 235108

3. Fault Confirmation
Subtask 23-51-00-710-094-A

A. Test
(1) Do the operational test of the First Officer ACP switching to the Third Occupant ACP AMM 23-51-00-710-003.

NOTE: Do this test for the First Officer station only.

4. Fault Isolation
Subtask 23-51-00-810-094-A

A. If the AUDIO 3XFRD indication does not come into view on the upper display unit of the ECAM system:

(1) If the fault continues:

Do a check for a ground signal at pin 1 of the AUDIO SWITCHING selector switch (16RN) ASM 235104.

(a) If there is no ground signal:

Repair the wiring between the SEL SW-AUDIO SWITCHING [16RN] and the ground terminal ASM 235104.

(b) If there is a ground signal:

Do a check and repair the wiring from the SEL SW-AUDIO SWITCHING [16RN] pin 4 to first terminal block ASM 235104.

Subtask 23-51-00-710-095-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:46 UTC