Failure of the CFDIU

TASK 31-32-00-810-937-A
Failure of the CFDIU

1. Possible Causes

CFDIU [1TW]
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 462106

3. Fault Confirmation
Subtask 31-32-00-740-310-A

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

4. Fault Isolation
Subtask 31-32-00-810-188-A

A. If the test gives the maintenance message NO ATSU DATA:
(1) replace the CFDIU [1TW] AMM 31-32-34-000-001 and AMM 31-32-34-400-001.
(2) If the fault continues:

do a check and repair the wiring from the CFDIU (1TW) pins AB/9B, 9C to the first terminal block ASM 462106.

Subtask 31-32-00-869-051-A

B. Do the test given in Para. 3.B.

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