Ground Proximity Warning System Inoperative

TASK 34-48-00-810-825-A
Ground Proximity Warning System Inoperative

1. Possible Causes

GPWC [1WZ]
wiring of the ILS DATA INPUT bus from the GPWC (1WZ) to the first terminal block

2. Job Set-up Information
A. Referenced Information

3. Fault Confirmation
Subtask 34-48-00-865-056-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

Subtask 34-48-00-710-072-C ** ON A/C NOT FOR ALL

B. Test
(1) Do the BITE test of the MMR (system 1) AMM 34-36-00-740-003.

Subtask 34-48-00-710-072-F ** ON A/C NOT FOR ALL

B. Test
(1) Do the BITE test of the MMR (system 1) AMM 34-36-00-740-006.

Subtask 34-48-00-710-072-G ** ON A/C NOT FOR ALL

B. Test
(1) Do the BITE test of the ILS (system 1) AMM 34-36-00-740-004.

4. Fault Isolation
Subtask 34-48-00-810-077-B

A. If the test gives a maintenance message:

Subtask 34-48-00-810-078-B

B. If there is no fault:

(1) If the fault continues:

do a check and repair the wiring of the ILS DATA INPUT bus from the GPWC (1WZ) to the first terminal block ASM 344801.

Subtask 34-48-00-710-073-A

C. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:16 UTC