Loss of the IR 1 Bus 3 for the SEC 1

TASK 27-94-00-810-848-A
Loss of the IR 1 Bus 3 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 27-94-00-740-088-A

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

4. Fault Isolation
Subtask 27-94-00-810-097-B

A. If the BITE test gives the maintenance message:
SEC1 OR BUS3 FROM IR1

(1) If the fault continues:

do a check and repair the wiring of the DGI-02 signal from the SEC 1 (1CE1) to the first terminal block, COM and MON parts ASM 279253.

Subtask 27-94-00-740-089-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:15 UTC