Loss of the Left Aileron Changeover Signal for the ELAC 1

TASK 27-10-00-810-811-A
Loss of the Left Aileron Changeover Signal for the ELAC 1

1. Possible Causes

ELAC-1 [2CE1]
wiring between the COM part and the MON part of the ELAC 1, from DSO 2 (COM) to DSI 33 (MON) and from DSO 2 (MON) to DSI 33 (COM)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 279236
AMM 27-93-34-000-001	Removal of the ELAC
AMM 27-93-34-400-001	Installation of the ELAC
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)
AMM 29-10-00-863-003	Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-864-003	Depressurize the Blue Hydraulic System
AMM 29-23-00-863-001	Pressurize the Green Hydraulic System from the Yellow Hydraulic System through the PTU with the Electric Pump
AMM 29-23-00-864-001	Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
AMM 29-24-00-863-001	Pressurize the Yellow Hydraulic System with the Electric Pump
AMM 29-24-00-864-001	Depressurize the Yellow Hydraulic System

3. Fault Confirmation
Subtask 27-10-00-860-062-A

A. Job Set-Up
(1) Pressurize the aircraft hydraulic systems AMM 29-10-00-863-003, AMM 29-23-00-863-001, AMM 29-24-00-863-001.

Subtask 27-10-00-740-052-A

B. Test
(1) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.

Subtask 27-10-00-860-063-A

C. Put the aircraft back to its initial configuration.
(1) Depressurize the aircraft hydraulic systems AMM 29-10-00-864-003, AMM 29-23-00-864-001, AMM 29-24-00-864-001.

4. Fault Isolation
Subtask 27-10-00-810-060-A

A. If the test gives the maintenance message:
CHECK L AIL CHANGE OVER OF ELAC 1

(1) If the fault continues:

do a check and repair the wiring between the COM part and the MON part of the ELAC 1, from DSO 2 (COM) to DSI 33 (MON) and from DSO 2 (MON) to DSI 33 (COM), ASM 279236.

Subtask 27-10-00-740-053-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:26 UTC