Loss of the THS Command Transducer Signal for the SEC 1

TASK 27-94-00-810-836-A
Loss of the THS Command Transducer Signal for the SEC 1

1. Possible Causes

SEC-1 [1CE1]
wiring from the ANI 2-3 XDCR COM signal of the SEC 1 (1CE1) to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-90-00-810-817-A	Loss of the ACS1 Signal of the SEC1 COM Side
ASM 279412
AMM 27-94-34-000-001	Removal of the SEC
AMM 27-94-34-400-001	Installation of the SEC
AMM 27-96-00-710-022	Operational Test of the THS Actuator Electrical Control (Activation for BITE Test)
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)

3. Fault Confirmation
Subtask 27-94-00-700-088-A

A. Test
(1) Do the operational test of the THS actuator electrical control AMM 27-96-00-710-022.

NOTE: Do the ground setting only with the SEC 1.

(2) Do the BITE test of the EFCS (Ground Scanning) AMM 27-96-00-740-001.
(a) If the ground scanning gives the maintenance message:
SEC1 COM OR WIRING FROM THS ACTR XDCR2 9CE

refer to Para. Fault Isolation.

(b) If the ground scanning gives at least two maintenance messages of the list below:
SEC1 COM OR WIRING FROM THS ACTR XDCR2 9CE
SEC1 OR WIRING FROM L B ELEV POS XDCR 34CE3
SEC1 OR WIRING FROM R B ELEV POS XDCR 34CE4

do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-817).

4. Fault Isolation
Subtask 27-94-00-810-085-A

A. If the BITE test gives the maintenance message:
SEC1 COM OR WIRING FROM THS ACTR XDCR2 9CE

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

(1) If the fault continues:

do a check and repair the wiring from the ANI 2-3 XDCR COM signal of the SEC 1 (1CE1) to the first terminal block, ASM 279412.

Subtask 27-94-00-700-089-A

B. Do the tests given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:14 UTC