Loss of the Blue Hydraulic Pressure Switch Signal for the ELAC 1

TASK 27-93-00-810-819-A
Loss of the Blue Hydraulic Pressure Switch Signal for the ELAC 1

1. Possible Causes

ELAC-1 [2CE1]
wiring of the LOW BLUE PRESS signal from the ELAC 1 (2CE1) to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 279227
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

3. Fault Confirmation
Subtask 27-93-00-860-050-A

A. Job Set-Up
(1) Pressurize the Blue hydraulic system with the electric pump AMM 29-10-00-863-003.

Subtask 27-93-00-740-058-A

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

4. Fault Isolation
Subtask 27-93-00-810-068-B

A. If the BITE test gives the maintenance message:
ELAC1 OR WIRING FROM B HYD PRESS SW1
or
ELAC1 OR WIRING FROM B HYD PRESS SW2

(1) If the fault continues:

do a check and repair the wiring of the LOW BLUE PRESS signal from the ELAC 1 (2CE1) to the first terminal block, COM or MON part as shown in the maintenance message (the COM part is for the maintenance message ELAC 1 OR WIRING FROM B HYD PRESS SW 1 and the MON part is for the maintenance message ELAC 1 OR WIRING FROM B HYD PRESS SW 2) ASM 279227.

Subtask 27-93-00-740-059-A

B. Do the test given in Para. 3.

5. Close-up
Subtask 27-93-00-860-051-A

A. Depressurize the Blue hydraulic system AMM 29-10-00-864-003.

[Rev.8 from Aug 2018] 2026.04.04 04:27:56 UTC