Only MASTER or WARN or CAUT section(s) of MASTER CAUT or/and MASTER WARN Lights on

TASK 31-53-00-810-965-A
Only MASTER or WARN or CAUT section(s) of MASTER CAUT or/and MASTER WARN Lights on

1. Possible Causes

FWC-2 [1WW2]
FWC-1 [1WW1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-10-00-710-001	Operational Test of the Takeover and Priority Pushbutton Switches
AMM 22-30-00-710-003	Operational Test of the Engine / Autothrust System Isolation (with AIDS)
AMM 31-53-34-000-001	Removal of the Flight Warning Computer (FWC)
AMM 31-53-34-400-001	Installation of the Flight Warning Computer (FWC)

3. Fault Confirmation
Subtask 31-53-00-710-316-B

A. Test

NOTE: During the tests, you must push the takeover and priority pushbutton switch or the A/THR instinctive disconnect pushbutton switch more than 0.2 second.

(1) Do the operational test of the takeover and priority pushbutton switches AMM 22-10-00-710-001.
(2) Do the operational test of the engine/autothrust system Isolation (with AIDS) AMM 22-30-00-710-003.

4. Fault Isolation
Subtask 31-53-00-810-199-A

A. If the tests confirm the crew observation:

half light of MASTER CAUT Light on

or/and
half light of MASTER WARN Light on

(1) Replace the FWC-2 [1WW2] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.
(2) If the fault continues:

Replace the FWC-1 [1WW1] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.

Subtask 31-53-00-710-308-A

B. Test
(1) Do the tests given in Para. 3.
(2) Make sure that the MASTER CAUT and MASTER WARN lights operate correctly.

[Rev.8 from Aug 2018] 2026.04.04 04:30:22 UTC