FDIMU Receives No Data from the LGCIU 1 or LGCIU 2

TASK 31-36-00-810-896-A
FDIMU Receives No Data from the LGCIU 1 or LGCIU 2

1. Possible Causes

wiring
LGCIU-1 [5GA1]
LGCIU-2 [5GA2]
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 32-69-00-740-001	BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative

3. Fault Confirmation
Subtask 31-36-00-740-170-A ** ON A/C NOT FOR ALL

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

NOTE: Make sure that the circuit breakers 5TV, 2GA, 52GA on the panel 121VU and 1GA on the panel 49VU are closed during the test.

4. Fault Isolation
Subtask 31-36-00-810-113-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:

LGCIU1 (5GA1)/FDIMU (10TV) or
LGCIU2 (5GA2)/FDIMU (10TV)

(1) Do the BITE test of the landing gear AMM 32-69-00-740-001.

(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 LGCIU-1 [5GA1] or LGCIU-2 [5GA2] and the DMU/FDIU (FDIMU) [10TV] ASM 313701:

LGCIU 1 Connector AA/13K to FDIMU Connector AA/1C
LGCIU 1 Connector AA/15K to FDIMU Connector AA/1D
or,
LGCIU 2 Connector AA/13K to FDIMU Connector AB/1C
LGCIU 2 Connector AA/15K to FDIMU Connector AB/1D

(3) If the fault continues:

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

Subtask 31-36-00-740-171-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:05 UTC