Incorrect Hydraulic Pressure-Switch Status Received by the ELAC1 or FWC at Engine Start

TASK 27-93-00-810-951-A
Incorrect Hydraulic Pressure-Switch Status Received by the ELAC1 or FWC at Engine Start

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-92-17-000-001	Removal of the Flight Control Pressure Switch
AMM 27-92-17-000-003	Removal of the Flight Control Pressure Switch
AMM 27-92-17-400-001	Installation of the Flight Control Pressure Switch
AMM 27-92-17-400-003	Installation of the Flight Control Pressure Switch
AMM 29-32-12-000-001	Removal of the System Pressure Switch
AMM 29-32-12-000-002	Removal of the System Pressure Switch
AMM 29-32-12-400-001	Installation of the System Pressure Switch
AMM 29-32-12-400-002	Installation of the System Pressure Switch

3. Fault Confirmation
Subtask 27-93-00-710-063-A

A. Test
(1) Not applicable, you cannot confirm this fault on the ground.

4. Fault Isolation

NOTE: On the upper ECAM display unit, the ELAC1 FAULT warning came into view and went out of view after a few seconds during the engine start phase.

Subtask 27-93-00-810-228-A

A. Do the steps that follow:
(1) If the fault occurred during start of the LH engine first:

replace the SYSTEM-PRESS-SW [1151GN] AMM 29-32-12-000-001 and AMM 29-32-12-400-001.
if the fault continues, replace the PRESS SW-G HYD, FLT CTL [10CE2] AMM 27-92-17-000-001 and AMM 27-92-17-400-001.

(2) If the fault occurred after start of the LH engine and before start of the RH engine:

replace the SYSTEM-PRESS-SW [2151GN] AMM 29-32-12-000-002 AMM 29-32-12-400-002.
if the fault continues, replace the PRESS SW-B HYD, FLT CTL [10CE1] AMM 27-92-17-000-003 and AMM 27-92-17-400-003.

(3) If the fault occurred after start of the RH engine and before start of the LH engine:

replace the SYSTEM-PRESS-SW [2151GN] AMM 29-32-12-000-002 and AMM 29-32-12-400-002.
if the fault continues, replace the PRESS SW-B HYD, FLT CTL [10CE1] AMM 27-92-17-000-003 and AMM 27-92-17-400-003.

[Rev.8 from Aug 2018] 2026.04.04 04:28:08 UTC