Loss of the IRS 2 Output Bus by the DMC 3

TASK 31-63-00-810-869-A
Loss of the IRS 2 Output Bus by the DMC 3

1. Possible Causes

DMC-3 [1WT3]
wiring

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 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU

3. Fault Confirmation
Subtask 31-63-00-865-101-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ADIRS/ADIRU/2PWR/SHED	10FP	N10
** ON A/C ALL
121VU	ADIRS/ADIRU/2/26VAC AND AOA	5FP2	N08
121VU	ADIRS/ADIRU/2/115VAC	4FP2	N06
121VU	ADIRS/ADIRU/2/28VDC	6FP2	N04
** ON A/C NOT FOR ALL
121VU	ADIRS/2PWR/SHED &/AOA2 MON	10FP	N10

Subtask 31-63-00-740-148-A ** ON A/C NOT FOR ALL

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

Subtask 31-63-00-740-148-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 31-63-00-810-117-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DMC 3 : NO IRS 2 DATA:

replace the DMC-3 [1WT3] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.

(1) If the fault continues:

do a check and repair the wiring from the DMC 3 (1WT3) pins AA/5G, 5H to the first terminal block ASM 316201.

Subtask 31-63-00-810-117-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message ADIRU2(1FP2) BUS3 IR / DMC3(1WT3)

replace the DMC-3 [1WT3] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.

(1) If the fault continues:

do a check and repair the wiring from the ADIRU2(1FP2) pins AB-10C/11C to the DMC3 (1WT3) pins AA-4G/4H ASM 316201.

(2) If the fault continues:

replace the ADIRU2(1FP2) AMM 34-12-34-000-001 and AMM 34-12-34-400-001.

Subtask 31-63-00-740-149-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:40:10 UTC