Loss of the Bus Output from the GPSSU1 to the FWC1

TASK 31-53-00-810-910-A
Loss of the Bus Output from the GPSSU1 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 345803

3. Fault Confirmation
Subtask 31-53-00-710-256-A

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

4. Fault Isolation
Subtask 31-53-00-810-209-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FWC1: NO DATA FROM GPS1:

(1) If the fault continues:

Do a check and repair the wiring from FWC1 (1WW1) pins AB/7E, 7F, 9G, 9H to GPSSU1 (1SN1) pins A/29, 30 AWM 345803.

Subtask 31-53-00-810-209-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FWC1: NO DATA FROM GPS1:

(1) If the fault continues:

Do a check and repair the wiring from FWC1 (1WW1) pins AB/7E, 7F, 9G, 9H to MMR1 (40RT1) pins AB/9E, 9F ASM 343602.

Subtask 31-53-00-710-257-A

B. Do the test given in Para. 3.

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