Loss of the Bus Output from the GPSSU1 to the CFDIU

TASK 31-32-00-810-923-A
Loss of the Bus Output from the GPSSU1 to the CFDIU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU
ASM 345801

3. Fault Confirmation
Subtask 31-32-00-740-290-A

A. Test
On the CFDS MENU page, get access to the AVIONICS STATUS page AMM 31-32-00-869-002.

4. Fault Isolation
Subtask 31-32-00-810-173-D

A. If the test gives the maintenance message NO MMR 1 DATA:

(1) If the fault continues:

do a check and repair the wiring from CFDIU (1TW) pins AA/1F, 1G to the first terminal block ASM 345801.

Subtask 31-32-00-740-291-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:58 UTC