Loss of the Output Bus from the FDIMU to the CFDIU

TASK 31-32-00-810-945-A
Loss of the Output Bus from the FDIMU to the CFDIU

1. Possible Causes

CFDIU [1TW]
DMU/FDIU (FDIMU) [10TV]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-740-009	Read the AVIONICS STATUS on the MCDU
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU
ASM 313601
AMM 31-36-34-000-002	Removal of the FDIU/DMU (FDIMU)
AMM 31-36-34-400-002	Installation of the FDIU/DMU (FDIMU)

3. Fault Confirmation
Subtask 31-32-00-875-051-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
121VU	AIDS & RCDR/FDIMU	5TV	K15

Subtask 31-32-00-740-319-A ** ON A/C NOT FOR ALL

B. Read the AVIONICS STATUS on the MCDU AMM 31-32-00-740-009.

4. Fault Isolation
Subtask 31-32-00-810-199-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message NO FDIMU DATA:

Replace the CFDIU [1TW] AMM 31-32-34-000-001 and AMM 31-32-34-400-001.

(1) If the fault continues:

Replace the DMU/FDIU (FDIMU) [10TV] AMM 31-36-34-000-002 and AMM 31-36-34-400-002.

(a) If the fault continues:

Do a check and repair the wiring from:

1 The CFDIU (1TW) pins AB/8B, 8C to the FDIMU (10TV) pins AA/12E, 12F ASM 313601.
2 The CFDIU (1TW) pins AB/3F, 3G to the FDIMU (10TV) pins AA/11E, 11F ASM 313601

Subtask 31-32-00-740-320-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:59 UTC