Failure of the SEC 1 Engagement

TASK 27-94-00-810-924-A
Failure of the SEC 1 Engagement

1. Possible Causes

SEC-1 [1CE1]
wiring of the SEC1 ENGAGED signal (DSI4)
wiring from the pushbutton switch (5CE1)
P/BSW-FLT CTL/SEC 1 (5CE1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 279204
AIPC 27920802
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 27-94-00-740-179-A

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

4. Fault Isolation
Subtask 27-94-00-810-169-A

A. If the test confirms the fault:
(1) Replace the SEC-1 [1CE1] AMM 27-94-34-000-001 and AMM 27-94-34-400-001.
(2) If the fault continues:
(a) Do a check and repair the wiring of the SEC1 ENGAGED signal (DSI4) from the SEC1 (1CE1) COM part and MON part to the first terminal block ASM 279204.
(b) Do a check and repair the wiring from the pushbutton switch (5CE1), pin A/C1 and pin A/C3 to the first terminal block ASM 279204.
(3) If the fault continues:

Replace the P/BSW-FLT CTL/SEC 1 (5CE1) AIPC 27920802.

Subtask 27-94-00-740-180-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:28:22 UTC