Loss of the Output Bus from the FDIU or FDIMU to the CFDIU

TASK 31-32-00-810-824-A
Loss of the Output Bus from the FDIU or FDIMU to the CFDIU

1. Possible Causes

CFDIU [1TW]
FDIU [2TU]
DMU/FDIU (FDIMU) [10TV]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-740-003	Ground Scanning of the CFDIU
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU
AMM 31-33-34-000-001	Removal of the Flight Data Interface Unit (FDIU)
AMM 31-33-34-400-001	Installation of the Flight Data Interface Unit (FDIU)
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 31-32-00-740-094-A

A. Test
Do the ground scanning of the CFDIU AMM 31-32-00-740-003.

4. Fault Isolation
Subtask 31-32-00-810-072-A

A. If the test gives the maintenance message NO FDIU 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 FDIU [2TU] (if FDIU installed) AMM 31-33-34-000-001 and AMM 31-33-34-400-001

or
replace the DMU/FDIU (FDIMU) [10TV] (if FDIMU installed) 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 ASM 313601:

1 from the CFDIU (1TW) to the FDIU (2TU) (if installed), from pins AB/8B, 8C to pins AB/9J, 9K.

or

2 from the CFDIU (1TW) to the FDIMU (10TV) (if installed), from pins AB/8B, 8C to pins AA/12E, 12F.

Subtask 31-32-00-740-095-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:49 UTC