FDIMU Receives No Data from the SDAC 1 or SDAC 2

TASK 31-36-00-810-915-A
FDIMU Receives No Data from the SDAC 1 or SDAC 2

1. Possible Causes

wiring
SDAC-1 [1WV1]
SDAC-2 [1WV2]
DMU/FDIU (FDIMU) [10TV]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-36-00-740-012	Test of the Flight Data Interface and Management Unit (FDIMU)
AMM 31-36-34-000-002	Removal of the FDIU/DMU (FDIMU)
AMM 31-36-34-400-002	Installation of the FDIU/DMU (FDIMU)
ASM 313701
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System

3. Fault Confirmation
Subtask 31-36-00-865-051-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	SDAC/1 AND 2/28VDC/ESS BUS	12WV	F05
49VU	SDAC/1/SPLY	3WV	F04
49VU	SDAC/2/26VAC SYNC/AC ESS BUS	6WV	F03
49VU	SDAC/1/26VAC SYNC/AC ESS BUS	5WV	F02
** ON A/C NOT FOR ALL
121VU	EIS/SDAC/1/BUS1/26VAC SYNC AC	9WV	Q04
** ON A/C NOT FOR ALL
121VU	AIDS & RCDR/FDIMU	5TV	K15
121VU	HYDRAULIC/HYD/QTY/IND	1831GQ	P35
121VU	EIS/SDAC/2/SPLY	2WV	Q06
121VU	EIS/SDAC/2/BUS1/26VAC SYNC AC	10WV	Q05
121VU	EIS/SDAC/1/BUS2/26VAC SYNC AC	7WV	Q03
121VU	EIS/SDAC/2/BUS2/26VAC SYNC AC	8WV	Q02

Subtask 31-36-00-740-202-A ** ON A/C NOT FOR ALL

B. Do the FDIMU (10TV) fault monitoring test (AIDS-part) AMM 31-36-00-740-012.

4. Fault Isolation
Subtask 31-36-00-810-129-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:

SDAC1 (1WV1) / FDIMU (10TV) or
SDAC2 (1WV2) / FDIMU (10TV)

(1) Do the ground scanning of the central warning system AMM 31-50-00-710-001.

(a) If the test gives a different maintenance message, you can find the related trouble shooting procedure in the applicable Page Block 201.

(2) If the fault continues:

do a check and if necessary repair the wiring between the SDAC-1 [1WV1] or SDAC-2 [1WV2] and the DMU/FDIU (FDIMU) [10TV] ASM 313701:

SDAC 1 Connector AB/8J to FDIMU Connector AA/6G
SDAC 1 Connector AB/8K to FDIMU Connector AA/6H
or
SDAC 2 Connector AB/8J to FDIMU Connector AB/6G
SDAC 2 Connector AB/8K to FDIMU Connector AB/6H

(3) If the fault continues:

replace the FDIMU (10TV) AMM 31-36-34-000-002 and AMM 31-36-34-400-002.

Subtask 31-36-00-740-203-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:07 UTC