Loss of the BUS 3 Signal for the SEC 1

TASK 27-94-00-810-864-A
Loss of the BUS 3 Signal for the SEC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 279253
AMM 27-94-34-000-001	Removal of the SEC
AMM 27-94-34-400-001	Installation of the SEC
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)

3. Fault Confirmation
Subtask 27-94-00-740-112-A

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

4. Fault Isolation
Subtask 27-94-00-810-109-A

A. If the BITE test gives the maintenance message:
SEC1 MON BUS3
or
SEC1 COM BUS3

(1) If the fault continues:

do a check and repair the wiring of the DG03 signal from the SEC1 (1CE1) MON part to COM part if the maintenance message is SEC1 MON BUS3 ASM 279253
or
do a check and repair the wiring of the DG03 signal from the SEC1 (1CE1) COM part to MON part if the maintenance message is SEC1 COM BUS3 ASM 279253.

Subtask 27-94-00-740-113-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:16 UTC