Loss of the Bus Output from the GPWC Computer to the CFDIU

TASK 31-32-00-810-843-A
Loss of the Bus Output from the GPWC Computer 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
ASM 313205
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU
AMM 34-48-34-000-001	Removal of the GPWC
AMM 34-48-34-400-001	Installation of the GPWC

3. Fault Confirmation
Subtask 31-32-00-865-090-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	EIS/GPWS/115VAC	3WZ	P07
121VU	EIS/GPWS/28VDC	2WZ	P06

Subtask 31-32-00-740-132-A

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

4. Fault Isolation
Subtask 31-32-00-810-091-A

A. If the test gives the maintenance message NO GPWC DATA:

(1) If the fault continues:

(a) If the fault continues:

do a check and repair the wiring from the CFDIU (1TW) to the GPWC (1WZ) from pins AA/10H, 10J to pins AB/1C, 1D , ASM 313205.

Subtask 31-32-00-740-133-A

B. Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:29:51 UTC