FDIMU Receives No Data from the GPWC

TASK 31-36-00-810-907-A
FDIMU Receives No Data from the GPWC

1. Possible Causes

wiring
GPWC [1WZ]
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 34-48-00-710-001	Operational Test of GPWS Ground Self-test Function

3. Fault Confirmation
Subtask 31-36-00-740-186-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, 2WZ, 3WZ on the panel 121VU are closed during the test.

4. Fault Isolation
Subtask 31-36-00-810-121-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:

GPWC(1WZ) / FDIMU(10TV)

(1) Do the operational test of the Ground Proximity Warning System AMM 34-48-00-710-001.

(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 GPWC [1WZ] and the DMU/FDIU (FDIMU) [10TV] ASM 313701:

GPWC Connector AB/1C to FDIMU Connector AA/5C
GPWC Connector AB/1D to FDIMU Connector AA/5D

(3) If the fault continues:

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

Subtask 31-36-00-740-187-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:06 UTC