Failure of the THS Monitor Transducer 2

TASK 27-93-00-810-840-A
Failure of the THS Monitor Transducer 2

1. Possible Causes

monitor position transducer
command position transducer
wiring of the XDCR MON SPLY signal from the THS actuator (9CE) to the first terminal block
wiring of the XDCR MON V1, V2 signals from the THS actuator (9CE) to the first terminal block
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 27-90-00-810-820-A	Loss of the ACS1 Signal of the ELAC1 MON Side and SEC1 MON 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 27-93-00-700-092-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 MON 9CE

refer to Para. Fault Isolation.

(b) If the ground scanning gives at least two maintenance messages of the list below:
L ELEV POS MON XDCR OF ELAC1/SEC1
L G ELEV MODE XDCR 34CE1
R B ELEV POS MON XDCR OF ELAC1/SEC1
R Y ELEV MODE XDCR 34CE2
THS ACTR XDCR2 MON 9CE

do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-820).

4. Fault Isolation
Subtask 27-93-00-810-089-A

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

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.

(1) If the fault continues:

Replace the monitor position transducer , AMM 27-44-56-000-001 and AMM 27-44-56-400-001.

(2) If the fault continues:

Replace the command position transducer , AMM 27-44-56-000-001 and AMM 27-44-56-400-001.

(3) If the fault continues:

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

(4) 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 27-93-00-700-093-A

B. Do the tests given in Para. 3.

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