Loss of the BUS 3 Signal of the FCDC 2 detected by the FCDC 1 and the SEC 1

TASK 27-95-00-810-818-A
Loss of the BUS 3 Signal of the FCDC 2 detected by the FCDC 1 and the SEC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 31-32-00-810-932-A	Failure of the Discrete Links
ASM 279503
AMM 27-95-34-000-001	Removal of the FCDC
AMM 27-95-34-400-001	Installation of the FCDC
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)

3. Fault Confirmation
Subtask 27-95-00-740-078-A

A. Test
(1) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-95-00-810-064-A

A. If the BITE test gives the maintenance message:
FCDC2 BUS3

(1) If the fault continues:

do the trouble shooting procedure (Ref. TSM TASK 31-32-00-810-932) related to the DGO 1/1 digital output signal of the FCDC 2 ASM 279503.

(2) If the fault continues:

do a check and repair the wiring of the DGO 1/1 signal from the FCDC 2 (3CE2) to the first terminal block ASM 279503.

Subtask 27-95-00-740-079-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:24 UTC