Loss of the FQI 1 Output Bus by the DMC 2

TASK 31-63-00-810-938-A
Loss of the FQI 1 Output Bus by the DMC 2

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 28-42-34-000-001	Removal of the Fuel Quantity-Indicating Computer (FQIC)
AMM 28-42-34-400-001	Installation of the Fuel Quantity-Indicating Computer (FQIC)
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 31-63-00-865-170-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 31-63-00-740-286-A ** ON A/C NOT FOR ALL

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

Subtask 31-63-00-740-286-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 31-63-00-810-186-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DMC 2 : NO FQI 1 DATA:

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring from the DMC 2 (1WT2) pins AA/11A, 11B to the first terminal block ASM 316201.

Subtask 31-63-00-810-186-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message FQI(3QT)BUS1/DMC2(1WT2):

(1) If the fault continues:

(2) If the fault continues:

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

(3) If the fault continues:

do a check and repair the wiring from the DMC 2 (1WT2) pins AD/9J, 9K to the first terminal block ASM 316201.

Subtask 31-63-00-740-287-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:30:47 UTC