Loss of the FQI 2 Output Bus by the DMC 3

TASK 31-63-00-810-921-A
Loss of the FQI 2 Output Bus by the DMC 3

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 28-42-00-740-007	Interrogation of the (SMITHS INDUSTRIES) FQIS Trouble Shooting Data
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

3. Fault Confirmation
Subtask 31-63-00-865-153-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FUEL/FQI/CHAN/1	1QT	A13
121VU	FUEL/FQI/CHANNEL/1 AND 2	8QT	L26
121VU	FUEL/FQI/CHAN/2	2QT	M27

Subtask 31-63-00-740-252-A ** ON A/C NOT FOR ALL

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

Subtask 31-63-00-740-252-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 31-63-00-810-169-A ** ON A/C NOT FOR ALL

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

(1) If the fault continues:

do a check and repair the wiring from the DMC 3 (1WT3) pins AA/11J, 11K to the first terminal block ASM 316201.

Subtask 31-63-00-810-169-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FQI(3QT)BUS2/DMC3(1WT3):

(1) If the fault continues:

Do the interrogation of the (SMITHS INDUSTRIES) FQIS Trouble Shooting Data AMM 28-42-00-740-007.

(2) If the fault continues:

do a check and repair the wiring from the DMC 3 (1WT3) pins AD/9A, 9B to the first terminal block ASM 316201.

Subtask 31-63-00-740-253-A

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

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