Loss of the ILS1 (MMR1) Output Bus by the DMC 2

TASK 31-63-00-810-853-A
Loss of the ILS1 (MMR1) Output Bus by the DMC 2

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
AMM 31-60-00-740-007	GROUND SCANNING Test of the DMC
ASM 316201
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC
AMM 34-36-31-000-001	Removal of the ILS Receiver
AMM 34-36-31-400-001	Installation of the ILS Receiver

3. Fault Confirmation
Subtask 31-63-00-865-085-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 31-63-00-740-116-A ** ON A/C NOT FOR ALL

B. Test
Do the EIS input test AMM 31-60-00-740-002.

Subtask 31-63-00-740-116-B ** ON A/C NOT FOR ALL

B. Test
Do the Ground Scanning Test of the DMC AMM 31-60-00-740-007.

4. Fault Isolation
Subtask 31-63-00-810-101-B

A. If the test confirms the fault:

(1) If the fault continues:

do a check and repair the wiring from the ILS1/MMR1(40RT1) pins AB-1G/1H to the DMC2 (1WT2) pins AA-10A/10B ASM 316201.

(2) If the fault continues:

Subtask 31-63-00-740-117-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:40:25 UTC