Loss of the Bus Output from the GPSSU2 to the FWC1

TASK 31-53-00-810-911-A
Loss of the Bus Output from the GPSSU2 to the FWC1

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
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)
ASM 343602
AWM 345807

3. Fault Confirmation
Subtask 31-53-00-710-258-A

A. Do the operational test of the central warning systems AMM 31-50-00-710-001.

4. Fault Isolation
Subtask 31-53-00-810-210-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FWC1: NO DATA FROM GPS2:

(1) If the fault continues:

Do a check and repair the wiring from FWC1 (1WW1) pins AE/7E, 7F, 9C, 9D to GPSSU2 (1SN2) pins A/24, 25 AWM 345807.

Subtask 31-53-00-810-210-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FWC1: NO DATA FROM GPS2:

(1) If the fault continues:

Do a check and repair the wiring from FWC1 (1WW1) pins AE/7E, 7F, 9C, 9D to MMR2 (40RT2) pins AB/2J, 2K ASM 343602.

Subtask 31-53-00-710-259-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:19 UTC