Loss of the Speedbrake Control Signal for the SEC 1

TASK 27-60-00-810-801-A
Loss of the Speedbrake Control Signal for the SEC 1

1. Possible Causes

SEC-1 [1CE1]
XDCR UNIT-SPD BRK CTL [7CE]
wiring from the SEC 1 (1CE1) to the transducer unit (7CE)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-92-14-000-001	Removal of the Speedbrake Control Transducer-Unit
AMM 27-92-14-400-001	Installation of the Speedbrake Control Transducer-Unit
ASM 279219
AMM 27-94-00-710-002	Operational Test of the Spoiler Elevator Computer 1 (SEC 1)
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 27-60-00-700-050-A

A. Test
(1) Do the operational test of the spoiler elevator computer 1 AMM 27-94-00-710-002.
(2) Do the BITE test of the EFCS (Ground Scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-60-00-810-050-B

A. If the BITE test gives the maintenance message:
SEC1 OR INPUT OF SPBK CTL XDCR UNIT 7CE

replace the SEC-1 [1CE1] , AMM 27-94-34-000-001 and AMM 27-94-34-400-001.

(1) If the fault continues:

replace the XDCR UNIT-SPD BRK CTL [7CE] , AMM 27-92-14-000-001 and AMM 27-92-14-400-001.

(2) If the fault continues:

do a check and repair the wiring from the SEC 1 (1CE1) to the transducer unit (7CE) ASM 279219.

Subtask 27-60-00-700-051-A

B. Do the operational test and the BITE test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:41 UTC