Removal of the System Pressure Switch

TASK 29-32-12-000-003-A
Removal of the System Pressure Switch

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

FIN: 3151GN

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	CAP - BLANKING
No specific	1	CONTAINER - HYDRAULIC FLUID RESISTANT
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	2	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
196BB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
System Pressure Switch of the Green and Yellow Hydraulic Systems

3. Job Set-up
Subtask 29-32-12-010-052-A

A. Get Access
(1) Open one main door of the main gear (Ref. AMM TASK 32-12-00-010-001).
(2) Open the access panel 196BB.

Subtask 29-32-12-865-052-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B06
** ON A/C ALL
105VU	FLIGHT CONTROLS/ELAC2/STBY SPLY	16CE2	A02
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	FLIGHT CONTROLS/SEC3/SPLY	21CE3	Q19
121VU	FLIGHT CONTROLS/SEC2/SPLY	21CE2	Q18
121VU	FLIGHT CONTROLS/ELAC2/NORM/SPLY	15CE2	R20

Subtask 29-32-12-860-051-A

C. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(3) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(4) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Yellow hydraulic system:

in the cockpit on the hydraulic section 40VU of the overhead panel,
on the ground service panel of the Yellow hydraulic system.

(5) Disconnect the isolation coupling of the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-860-001).
(6) Put the CONTAINER - HYDRAULIC FLUID RESISTANT in position below the system pressure switch to collect any hydraulic fluid.

4. Procedure
Subtask 29-32-12-020-054-B

A. Removal of the System Pressure Switch
(1) Disconnect the electrical connector (1).
(2) Put the CAP - BLANKING on the disconnected electrical connector (1).
(3) Remove the nut (5), the washer (6), the screw (8), the bonding jumper (7) and the clamp (9) from the system pressure switch (2).
(4) Cut and remove the lockwire.
(5) Loosen the system pressure switch (2) and remove it together with the O-ring (3) from the manifold (4).
(6) Discard the O-ring.
(7) Install a PLUG - BLANKING in the open ports.

[Rev.10 from 2021] 2026.04.01 08:04:22 UTC