Loss of the Servo Motor 3 Signal on the THS Actuator for the SEC 2

TASK 27-94-00-810-841-A
Loss of the Servo Motor 3 Signal on the THS Actuator for the SEC 2

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-44-57-000-001	Removal of the Pitch Trim Actuator from the THS Actuator
AMM 27-44-57-400-001	Installation of the Pitch Trim Actuator to the THS Actuator
ASM 279413
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 27-94-00-700-098-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 2.

(2) Do the BITE test of the EFCS (Ground Scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-94-00-810-090-A

A. If the BITE test gives the maintenance message:
SEC2 OR OUTPUT TO THS ACTR SERVO MOT3 9CE

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring of the command signal from the THS actuator (9CE) to the SEC 2 (1CE2), ASM 279413.

Subtask 27-94-00-700-099-A

B. Do the tests given in Para. 3.

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