FDIMU Receives No Data from MCDU 1 or MCDU 2

TASK 31-36-00-810-918-A
FDIMU Receives No Data from MCDU 1 or MCDU 2

1. Possible Causes

wiring
MCDU-1 [3CA1]
MCDU-2 [3CA2]
DMU/FDIU (FDIMU) [10TV]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-70-00-710-001	Operational Test of the Multipurpose Control and Display Unit (MCDU)
AMM 31-36-00-740-012	Test of the Flight Data Interface and Management Unit (FDIMU)
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 31-36-00-740-208-A ** ON A/C NOT FOR ALL

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

NOTE: Make sure that the circuit breakers 5TV, 11CA1, 11CA2 on the panel 121VU and 11CA1 on the panel 49VU are closed during the test.

4. Fault Isolation
Subtask 31-36-00-810-132-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:

MCDU1 (3CA1) / FDIMU (10TV)
MCDU2 (3CA2) / FDIMU (10TV)

(1) Do the operational test of the Flight Management System AMM 22-70-00-710-001.

(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 repair the wiring from the MCDU-1 [3CA1] or MCDU-2 [3CA2] to the DMU/FDIU (FDIMU) [10TV] ASM 313601:

MCDU 1 Connector A/27 to FDIMU Connector AA/11A
MCDU 1 Connector A/28 to FDIMU Connector AA/11B
MCDU 1 Connector A/11 to FDIMU Connector AA/11E
MCDU 1 Connector A/12 to FDIMU Connector AA/11F
or
MCDU 2 Connector A/27 to FDIMU Connector AB/11A
MCDU 2 Connector A/28 to FDIMU Connector AB/11B
MCDU 2 Connector A/11 to FDIMU Connector AA/11E
MCDU 2 Connector A/12 to FDIMU Connector AA/11F

(3) If the fault continues:

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

Subtask 31-36-00-740-209-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