Removal of the Pilot Valves of the Leakage-Measurement Solenoid Valves

TASK 29-19-51-000-004-A
Removal of the Pilot Valves of the Leakage-Measurement Solenoid Valves

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.

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

1. Reason for the Job
This task is applicable for Aircraft with the Green High-Pressure Manifold P/N D29070171 series.
This task is applicable for Aircraft with the Blue High-Pressure Manifold P/N D29070173 series.
This task is applicable for Aircraft with the Yellow High-Pressure Manifold P/N D29070171 series.
This task is not applicable for Aircraft with the Green High-Pressure Manifold P/N 1559A9900 series.
This task is not applicable for Aircraft with the Blue High-Pressure Manifold P/N 1554A9900 series.
This task is not applicable for Aircraft with the Yellow High-Pressure Manifold P/N 1553A9900 series.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	2	CAP - BLANKING
No specific	1	CONTAINER - HYDRAULIC FLUID RESISTANT
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
FOR [1150GP]
No specific	1	ACCESS PLATFORM 3M (10 FT)
No specific	2	WARNING NOTICE(S)
FOR [2150GP]
No specific	2	WARNING NOTICE(S)
FOR [3150GP]
No specific	2	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [2150GP]
195BB
FOR [3150GP]
196BB

C. Referenced Information

REFERENCE	DESIGNATION
Pilot Valves of the Green and Yellow Hydraulic System
Pilot Valve of the Blue Hydraulic System
FOR [1150GP]
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
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
FOR [2150GP]
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
FOR [3150GP]
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs

3. Job Set-up
Subtask 29-19-51-865-059-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	HYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST	1881GP	N35

Subtask 29-19-51-010-053-A

B. Get Access
(1) FOR [1150GP]
(a) Open one main door of the main gear (Ref. AMM TASK 32-12-00-010-001).
(b) Put the ACCESS PLATFORM 3M (10 FT) in position.
(2) FOR [2150GP]
(a) Open the access panel 195BB.
(3) FOR [3150GP]
(a) Open the access panel 196BB.

Subtask 29-19-51-860-056-A

C. Aircraft Maintenance Configuration
(1) FOR [1150GP]
(a) Disconnect the isolation coupling of the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-860-001).
(b) Depressurize the Green hydraulic system and put it in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(c) Depressurize the reservoir of the Green hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(2) FOR [2150GP]
(a) Depressurize the Blue hydraulic system and put it in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(b) Depressurize the reservoir of the Blue hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(3) FOR [3150GP]
(a) Depressurize the Yellow hydraulic system and put it in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(b) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).

Subtask 29-19-51-941-053-A

D. Safety Precautions
(1) Put a CONTAINER - HYDRAULIC FLUID RESISTANT in position below the replacement pilot valve to collect hydraulic fluid.
(2) FOR [1150GP]
(a) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Green hydraulic system:

In the cockpit on the hydraulic section 40VU of the overhead panel
On the ground service panel of the Green hydraulic system.

(3) FOR [2150GP]
(a) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Blue hydraulic system:

In the cockpit on the hydraulic section 40VU of the overhead panel
On the ground service panel of the Blue hydraulic system.

(4) FOR [3150GP]
(a) 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.

4. Procedure
Subtask 29-19-51-020-054-A

A. Removal of the Pilot Valve
(1) Disconnect the electrical connector (6).
(2) Put a CAP - BLANKING on the disconnected electrical connector (6) and on the receptacle.

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(3) Cut and remove the lockwire (8).

CAUTION: MAKE SURE THAT THE ELECTRICAL CONNECTOR(S) IS(ARE) DISCONNECTED BEFORE YOU DISCONNECT THE BONDING STRAP(S).

(4) Hold the pilot valve (3) and remove the two bolts (1), the washer (2) and the bonding strap (7).
(5) Remove the pilot valve (3).
(6) Remove the packings (4).
(7) Discard the packings.
(8) Install a PLUG - BLANKING in the open ports.

[Rev.10 from 2021] 2026.04.01 00:25:44 UTC