Failure of the CFDIU Detected by the CSAS

TASK 21-58-00-810-812-A
Failure of the CFDIU Detected by the CSAS

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-58-34-000-001	Removal of the CSAS Control Unit
AMM 21-58-34-400-001	Installation of the CSAS Control Unit
AMM 31-32-00-740-002	BITE Test of the Centralized Fault Display Interface Unit (CFDIU)
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU
ASM 462105

3. Fault Confirmation
Subtask 21-58-00-710-072-A ** ON A/C NOT FOR ALL

A. Do a read out of the post flight report.

NOTE: The fault cannot be reproduced on the ground.

4. Fault Isolation
Subtask 21-58-00-810-061-A ** ON A/C NOT FOR ALL

A. If the post flight report gives the maintenance message CFDIU(1TW)/CSAS CTL UNIT (100HW):

(1) If the test gives a different maintenance message, do the related trouble shooting procedure.
(2) If the fault continues:

(3) If the fault continues:

(a) If the fault continues:

remove the CFDIU and the CSAS Control Unit
do a check and repair the wiring of the CFDIU DATA BUS : between pins AA/11F,11G of the CFDIU and pins AB/11E,11F of the CSAS CONTROL UNIT ASM 462105
install the CFDIU and the CSAS CONTROL UNIT.

Subtask 21-58-00-710-073-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:24:50 UTC