Failure of the Left Elevator Position MON Transducer

TASK 27-30-00-810-803-A
Failure of the Left Elevator Position MON Transducer

1. Possible Causes

XDCR UNIT-ELEV POS, L [49CE1]
wiring of the POS RVDT MON SPLY signal
wiring of the POS RVDT MON V1, V2 signals

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 27-92-13-000-001	Removal of the Elevator Position Transducer-Unit
AMM 27-92-13-400-001	Installation of the Elevator Position Transducer-Unit
ASM 279307
ASM 279407
AMM 27-96-00-710-020	Operational Test of the Side Stick Assembly (Activation for the BITE Test)
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)

3. Fault Confirmation
Subtask 27-30-00-700-122-A

A. Test
(1) Do the operational test of the side stick assembly (Activation for the BITE test) AMM 27-96-00-710-020.
(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:
L ELEV POS MON XDCR OF ELAC1/SEC1

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 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 27-30-00-810-086-C

A. If the test gives the maintenance message L ELEV POS MON XDCR OF ELAC1/SEC1

disconnect and cross the electrical connectors of the elevator position transducer unit (49CE1) ASM 279307 and do the test given in Para. 3.

NOTE: After the test connect the electrical connectors on their initial plugs.

(1) If the fault continues:

do the trouble shooting procedure (Ref. TSM TASK 31-32-00-810-933) related to the ANI 2-X analog input signal of the ELAC COM and SEC COM ASM 279307 and ASM 279407.

(2) If the test gives the maintenance message L ELEV POS MON XDCR OF ELAC2/SEC2:

replace the XDCR UNIT-ELEV POS, L [49CE1] AMM 27-92-13-000-001 and AMM 27-92-13-400-001.

NOTE: The resistance of primary and secondary windings must be between 30 ohms and 500 ohms.

(3) If the test gives the maintenance message L ELEV POS MON XDCR OF ELAC1/SEC1
(a) Do a check of the wiring of the POS RVDT MON SPLY signal from the transducer unit (49CE1) plug B to the first terminal block ASM 279307:

if there is continuity, see Para. (b)
if there is no continuity, repair the above wiring.

(b) Do a check and repair the wiring of the POS RVDT MON V1, V2 signals from the transducer unit (49CE1), plug B to the first terminal block ASM 279307.

Subtask 27-30-00-700-123-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:30 UTC