Removal of the Power Transfer Unit (PTU) Manifold of the Yellow Hydraulic System

TASK 29-13-15-000-001-A
Removal of the Power Transfer Unit (PTU) Manifold of the Yellow Hydraulic System

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: 3015GM

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	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	1	CONTAINER 4 L (1 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	2	WARNING NOTICE(S)

B. 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
PTU Manifold

3. Job Set-up
Subtask 29-13-15-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N30
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
** ON A/C ALL
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-13-15-860-052-A

B. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) 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.

(3) Make sure that the Yellow hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(4) Depressurize the reservoir of the Yellow hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(5) Open the main gear doors (Ref. AMM TASK 32-12-00-010-001).
(6) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position at the main gear doors.
(7) Put a CONTAINER 4 L (1 USGAL) below the PTU manifold of the Yellow hydraulic system to collect unwanted hydraulic fluid.
(8) Disconnect the isolation coupling of the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-860-001).

4. Procedure
Subtask 29-13-15-020-050-E

A. Removal of the PTU Manifold

CAUTION: USE A SECOND WRENCH TO APPLY COUNTERTORQUE TO THE UNION WHEN YOU DISCONNECT/CONNECT HYDRAULIC LINES ON UNIONS. IF YOU DO NOT USE THE SECOND WRENCH, THERE IS A RISK THAT YOU WILL LOOSEN OR TIGHTEN THE UNION TOO MUCH.

(1) Disconnect the electrical connector (29) from the PTU solenoid valve.
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Loosen the pipe end-fitting (4) and disconnect the pipe (3) from the reducer (5).
(4) Loosen the pipe end-fitting (22) and disconnect the pipe (21) from the check valve 3093GM.
(5) Loosen the pipe end-fitting (49) and disconnect the pipe (48) from the union (50).
(6) Loosen the pipe end-fitting (12) and disconnect the pipe (11) from the union (13).
(7) If the bolts (1) are safetied with lockwire:

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.

(a) Remove and discard the lockwire from the bolts (1) and the coupling half (46).
(8) Hold the manifold (7) and remove the bolts (1) and washers (2).
(9) Remove the manifold (7) from the aircraft.
(10) Install a PLUG - BLANKING in all pipe connections and manifold ports.

[Rev.10 from 2021] 2026.04.01 00:19:55 UTC