Loss of the Signal of the Left Elevator Position-Transducer (MON) by the ELAC 1

TASK 27-93-00-810-859-A
Loss of the Signal of the Left Elevator Position-Transducer (MON) by the ELAC 1

1. Possible Causes

ELAC-1 [2CE1]
wiring of the POS XDCR MON (ANI 2-1) signal from the ELAC 1 (2CE1) MON part to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 27-90-00-810-811-A	Loss of the ACS1 Signal of the ELAC1 COM Side
TSM TASK 27-90-00-810-812-A	Loss of the ACS1 Signal of the ELAC1 MON Side
TSM TASK 27-90-00-810-813-A	Loss of the ACS1 of the ELAC1 COM and MON Sides
ASM 279307
AMM 27-93-34-000-001	Removal of the ELAC
AMM 27-93-34-400-001	Installation of the ELAC
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 27-93-00-700-106-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:
ELAC1 OR WIRING FROM L ELEV POS MON XDCR

refer to Para. Fault Isolation.

(b) If the ground scanning gives at least two maintenance messages of the two lists below:
First list:

ELAC1 COM OR WIRING FROM THS ACTR XDCR2 9CE
ELAC1 OR WIRING FROM L B ELEV POS XDCR 34CE3
ELAC1 OR WIRING FROM R B ELEV POS XDCR 34CE4
Second list:
ELAC1 MON OR WIRING FROM THS ACTR XDCR2 9CE
ELAC1 OR WIRING FROM L ELEV POS MON XDCR
ELAC1 OR WIRING FROM R ELEV POS MON XDCR
ELAC1 OR WIRING FROM L G ELEV MODE XDCR 34CE1
ELAC1 OR WIRING FROM R Y ELEV MODE XDCR 34CE2

1 First case:
Combination of maintenance messages of the first list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-811).
2 Second case:
Combination of maintenance messages of the second list, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-812).
3 Third case:
Combination of maintenance messages of the first and second lists, do this trouble shooting procedure (Ref. TSM TASK 27-90-00-810-813).

4. Fault Isolation
Subtask 27-93-00-810-108-A

A. If the test gives the maintenance message:
ELAC1 OR WIRING FROM L ELEV POS MON XDCR

Replace the ELAC-1 [2CE1] AMM 27-93-34-000-001 and AMM 27-93-34-400-001.

(1) If the fault continues:

Do a check and repair the wiring of the POS XDCR MON (ANI 2-1) signal from the ELAC 1 (2CE1) MON part to the first terminal block ASM 279307.

Subtask 27-93-00-700-107-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:59 UTC