Failure of the THS Command Transducer 2

TASK 27-93-00-810-838-A
Failure of the THS Command Transducer 2

1. Possible Causes

Command Position Transducer
wiring of the XDCR COM SPLY signal from the THS actuator (9CE) to the first terminal block
wiring of the XDCR COM V1, V2 signals from the THS actuator (9CE) to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-90-00-810-819-A	Loss of the ACS1 Signal of the ELAC1 COM Side and SEC1 COM Side
TSM TASK 31-32-00-810-933-A	Failure of the Analog Links
AMM 27-44-56-000-001	Removal of the Position Transducer from the THS Actuator
AMM 27-44-56-400-001	Installation of the Position Transducer to the THS Actuator
ASM 279312
ASM 279412
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 27-93-00-700-088-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 ELAC 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:
THS ACTR XDCR2 9CE

refer to Para. Fault Isolation.

(b) If the ground scanning gives at least two maintenance messages of the list below:
L B ELEV POS XDCR 34CE3 COM E1/S1 : USE STBY XDCR
R B ELEV POS XDCR 34CE4 COM E1/S1 : USE STBY XDCR
THS ACTR XDCR2 9CE

do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-819).

4. Fault Isolation
Subtask 27-93-00-810-087-A

A. If the BITE test gives the maintenance message:
THS ACTR XDCR2 9CE

replace the Command Position Transducer , AMM 27-44-56-000-001 and AMM 27-44-56-400-001.

(1) If the fault continues:

do the trouble shooting procedure (Ref. TSM TASK 31-32-00-810-933) related to the ANI 2-3 analog input signal of the ELAC 1 and SEC 1 ASM 279312 and ASM 279412.

(2) If the fault continues:

do a check of the wiring of the XDCR COM SPLY signal from the THS actuator (9CE) to the first terminal block, ASM 279312.

(a) If there is no continuity, repair the wiring.
(b) If there is continuity:

do a check and repair the wiring of the XDCR COM V1, V2 signals from the THS actuator (9CE) to the first terminal block, ASM 279312.

Subtask 27-93-00-700-089-A

B. Do the tests given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:57 UTC