Incorrect Hydraulic Pressure Status Received by the FWC

TASK 27-93-00-810-948-A
Incorrect Hydraulic Pressure Status Received by the FWC

1. Possible Causes

FWC-1 [1WW1]
SYSTEM-PRESS-SW [1151GN]
SYSTEM-PRESS-SW [2151GN]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)
AMM 29-10-00-200-008	Check Nitrogen Charge Pressure on Hydraulic Power Accumulators
ASM 293201
AMM 29-32-12-000-001	Removal of the System Pressure Switch
AMM 29-32-12-400-001	Installation of the System Pressure Switch
AMM 31-53-34-000-001	Removal of the Flight Warning Computer (FWC)
AMM 31-53-34-400-001	Installation of the Flight Warning Computer (FWC)

3. Fault Confirmation
Subtask 27-93-00-700-179-A

A. Test
(1) Not applicable, the fault is evident.

4. Fault Isolation
Subtask 27-93-00-810-221-A

A. If the ELAC 1 FAULT and ELAC 2 FAULT warnings are shown on the upper ECAM display unit and if the FAULT legend on the ELAC 1 and ELAC 2 pushbutton switches is off:

do the BITE test of the EFCS (Ground Scanning) AMM 27-96-00-740-001.

(1) If the test gives a maintenance message related to the Green or Blue hydraulic pressure switch with a F/CTL maintenance status:

do the trouble shooting procedure related to this maintenance message.

(2) If the test does not give a maintenance message:

Do an inspection of nitrogen charge pressure on hydraulic power accumulators AMM 29-10-00-200-008.

(a) If the fault continues:

replace the FWC-1 [1WW1] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.

(b) If the fault continues:

replace the SYSTEM-PRESS-SW [1151GN] AMM 29-32-12-000-001 and AMM 29-32-12-400-001.

replace the SYSTEM-PRESS-SW [2151GN] AMM 29-32-12-000-001 and AMM 29-32-12-400-001.

(d) If the fault continues:

do a check of the wiring from the FWC 1 to the pressure switch 1151GN ASM 293201
do a check and repair the wiring from the FWC 1 to the pressure switch 2151GN.

[Rev.8 from Aug 2018] 2026.04.04 04:39:09 UTC