Loss of the ILS RECEIVER 1 OUTPUT PORT 2 Bus Identified by the GPWC

TASK 34-36-00-810-809-A
Loss of the ILS RECEIVER 1 OUTPUT PORT 2 Bus Identified by the GPWC

1. Possible Causes

MMR-1 [40RT1]
wiring of the ILS RECEIVER OUT PORT 2 bus from the MMR-1 (40RT1) to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 343601
AMM 34-36-31-000-001	Removal of the ILS Receiver
AMM 34-36-31-400-001	Installation of the ILS Receiver
AMM 34-48-00-740-002	BITE Test of the GPWS

3. Fault Confirmation
Subtask 34-36-00-865-075-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	NAV/MMR/1	42RT1	G12
** ON A/C NOT FOR ALL
49VU	NAV/ILS/1	1RT1	G12

Subtask 34-36-00-740-062-C

B. Test
(1) Do the BITE test of the Enhanced GPWS AMM 34-48-00-740-002.

4. Fault Isolation
Subtask 34-36-00-810-060-C

A. If the test gives the maintenance message MMR1 (40RT1)/GPWC (1WZ):

(1) If the fault continues:

do a check and repair the wiring of the ILS RECEIVER OUT PORT 2 bus from the MMR-1 (40RT1) to the first terminal block ASM 343601.

Subtask 34-36-00-740-063-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:32:58 UTC