Loss of the ILS 1 Bus of the FWC 1

TASK 31-53-00-810-822-A
Loss of the ILS 1 Bus of the FWC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
ASM 315203
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 31-53-00-710-078-A

A. Test
(1) Do the operational test of the central warning systems (FWC) AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-53-00-810-071-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FWC 1 : NO DATA FROM ILS1:

(1) If the fault continues:

do a check and repair the wiring from the FWC 1 (1WW1) pins AB/7C, 7D to the first terminal block , ASM 315203.

Subtask 31-53-00-810-071-C ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message

(1) If the fault continues:

do a check and repair the wiring from the FWC 1 (1WW1) pins AB/7C, 7D to the first terminal block ASM 315203.

Subtask 31-53-00-710-079-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:12 UTC