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

TASK 29-11-15-000-001-A
Removal of the Power Transfer Unit (PTU) Manifold of the Green 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: 1088GM
FIN: 1113GM

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)
No specific	AR	CAP - BLANKING
No specific	1	CONTAINER 4 L (1 USGAL)
No specific	2	CONTAINER 5 L (1.32 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 with P/N series 1555A9900/1555B9900 ** ON A/C NOT FOR ALL
PTU Manifold with P/N series 1555A9900/1555B9900 ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 29-11-15-865-050-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	H12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/CTL	1701GK	R35
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33

Subtask 29-11-15-860-052-A ** ON A/C NOT FOR ALL

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 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) Make sure that the Green 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 Green hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(5) Open one of the main doors of the main gear (Ref. AMM TASK 32-12-00-010-001).
(6) Put the ACCESS PLATFORM 3M (10 FT) in position at the main doors of the main gear.
(7) Put a CONTAINER 4 L (1 USGAL) below the PTU manifold of the Green 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).

Subtask 29-11-15-860-052-B ** ON A/C NOT FOR ALL

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 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) Make sure that the Green 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 Green hydraulic system (Ref. AMM TASK 29-14-00-614-001).
(5) Open one of the main doors of the main gear (Ref. AMM TASK 32-12-00-010-001).
(6) Put the ACCESS PLATFORM 3M (10 FT) in position at the main doors of the main gear.
(7) Put the CONTAINER 5 L (1.32 USGAL) below the PTU manifold and below HP manifold of the Green 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 29-11-15-020-050-B

A. Removal of the Manifold

PTU Manifold with P/N series 1555A9900/1555B9900 ** ON A/C NOT FOR ALL

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 connectors (29) and (36).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

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

(3) Remove the nut (53), the bolt (49) and the washer (50) and disconnect the bonding strap (51) from the structural attachment (52).
(4) Remove the nuts (68), the bolts (66) and the washers (67) and disconnect the bonding strap (70) from the structural attachment (69) and the manifold (35).
(5) Loosen the pipe end-fittings (8) and (40) and remove the pipe (7).
(6) Loosen the pipe end-fittings (33) and (42) and remove the pipe (32).
(7) Loosen the pipe end-fitting (2) and disconnect the pipe (1) from the union (3).
(8) Loosen the pipe end-fittings (18) and (54) and remove the pipe (17).
(9) Loosen the pipe end-fitting (22) and disconnect the pipe (21) from the union (23).
(10) Loosen the pipe end-fitting (26) and disconnect the tee-connector (25) from the union (27).
(11) Hold the manifold (35) and remove the nuts (11) and the washers (12).
(12) Remove the manifold (35) together with the spacer plate (13).
(13) Install a PLUG - BLANKING on the open connections of the manifold and on the disconnected pipe ends.

[Rev.10 from 2021] 2026.04.01 00:14:29 UTC