Failure of the Left Elevator Position MON Transducer

TASK 27-30-00-810-814-A
Failure of the Left Elevator Position MON Transducer

1. Possible Causes

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

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-90-00-810-824-A	Loss of the ACS1 Signal of the ELAC2 MON Side and SEC2 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 279308
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 27-30-00-700-125-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 ELAC2/SEC2

refer to Para. Fault Isolation.

(b) If the ground scanning gives at least two maintenance messages of the list below:
L B ELEV MODE XDCR 34CE3
L ELEV POS MON XDCR OF ELAC2/SEC2
R B ELEV MODE XDCR 34CE4
R ELEV POS MON XDCR OF ELAC2/SEC2
ELAC2 MON OR INPUT OF THS ACTR XDCR1 9CE
SEC2 MON OR INPUT OF THS ACTR XDCR3 9CE

do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-824).

4. Fault Isolation
Subtask 27-30-00-810-088-C

A. If the test gives the maintenance message L ELEV POS MON XDCR OF ELAC2/SEC2

disconnect and cross the electrical connectors of the elevator position transducer unit (49CE1) ASM 279308 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 ELAC1/SEC1:

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

(3) If the test gives the maintenance message L ELEV POS MON XDCR OF ELAC2/SEC2
(a) Do a check of the wiring of the POS XDCR MON SPLY signal from the transducer unit (49CE1) plug A to the first terminal block ASM 279308:

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 XDCR MON V1, V2 signals from the transducer unit (49CE1) plug A to the first terminal block ASM 279308.

Subtask 27-30-00-700-126-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:31 UTC