Loss of the FCDC 1 BUS 4 Signal for the SEC 1

TASK 27-94-00-810-878-A
Loss of the FCDC 1 BUS 4 Signal for the SEC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-94-34-000-001	Removal of the SEC
AMM 27-94-34-400-001	Installation of the SEC
ASM 279502
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 27-94-00-740-124-A

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

4. Fault Isolation
Subtask 27-94-00-810-115-A

A. If the BITE test gives the maintenance message:
SEC1 MON OR BUS4 FROM FCDC1

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring of the DGI 10 signal from the SEC 1 (1CE1) to the FCDC 1 (3CE1) ASM 279502.

Subtask 27-94-00-740-125-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:18 UTC