Operational Test of the Power Transfer Unit (PTU) with the Engine Pumps

TASK 29-23-00-710-004-A
Operational Test of the Power Transfer Unit (PTU) with the Engine Pumps

CAUTION: DO NOT OPERATE THE ELECTRIC PUMP OR THE PTU IF THE SUPPLY OF HYDRAULIC FLUID IS NOT SUFFICIENT. MAKE SURE THAT THE RESERVOIRS HAVE SUFFICIENT AIR PRESSURE BEFORE YOU OPERATE THE PUMP/PTU.

FIN: 1088GM

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	CHOCK - WHEEL(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
TASK 12-12-29-611-002-A	Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 29-00-00-280-001-A	Check of the Internal Leakage of the Green Hydraulic System
TASK 29-00-00-280-003-A	Check of the Internal Leakage of the Yellow Hydraulic System
TASK 29-00-00-870-001-A	Bleeding Procedure of the Green Hydraulic System Upstream of the Engine Pump
TASK 29-00-00-870-002-A	Bleeding Procedure of the Green Hydraulic System Upstream of the PTU
TASK 29-00-00-870-004-A	Bleeding Procedure of the Yellow Hydraulic System Upstream of the Engine Pump
TASK 29-00-00-870-005-A	Bleeding Procedure of the Yellow Hydraulic System Upstream of the PTU
TASK 29-14-00-614-002-A	Pressurization of the Hydraulic Reservoirs through the Ground Connector
TASK 29-14-00-614-002-A-01	Pressurization of the Hydraulic Reservoirs with the Auxiliary Power Unit (APU)
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 71-00-00-710-003-A	Engine Automatic Start
TASK 71-00-00-710-003-B	Engine Automatic Start
TASK 71-00-00-710-018-A	Discontinued Start, Restart and Shutdown Procedures
TASK 71-00-00-710-028-A	Engine Shutdown
TASK 71-00-00-710-028-B	Engine Shutdown
TASK 71-00-00-710-043-A	Normal Engine Automatic-Start Procedure
TASK 29-23-00-00	POWER TRANSFER - DESCRIPTION AND OPERATION
PTU Indications

3. Job Set-up
Subtask 29-23-00-860-062-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On the ECAM control panel on the center pedestal, push the HYD pushbutton.
(4) Make sure that the HYD page of the lower ECAM Display Unit (DU) comes into view.
(5) Make sure that the ECAM does not show these warnings:

Low air pressure in the Yellow and Green reservoirs.
Low fluid level in the Yellow and Green reservoirs.

(6) If necessary, pressurize the applicable reservoir(s) (Ref. AMM TASK 29-14-00-614-002).
(7) If necessary, add fluid to the applicable reservoir(s) (Ref. AMM TASK 12-12-29-611-001) or (Ref. AMM TASK 12-12-29-611-002).
(8) If you do not add hydraulic fluid to the applicable reservoir(s):
(a) Make sure that the Yellow hydraulic system upstream of the engine pump is bled (Ref. AMM TASK 29-00-00-870-004).
(b) Make sure that the Yellow hydraulic system upstream of the PTU is bled (Ref. AMM TASK 29-00-00-870-005).
(c) Make sure that the Green hydraulic system upstream of the engine pump is bled (Ref. AMM TASK 29-00-00-870-001).
(d) Make sure that the Green hydraulic system upstream of the PTU is bled (Ref. AMM TASK 29-00-00-870-002).
(9) Put the CHOCK - WHEEL(S) in front of and behind the wheels of the main and the nose landing gears.

Subtask 29-23-00-865-061-A

B. Make sure that this(these) circuit breaker(s) is(are) closed:

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

4. Procedure
Subtask 29-23-00-710-054-A ** ON A/C NOT FOR ALL

A. Operational Test of the PTU with the Engine Pumps

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 WHEEL CHOCKS ARE IN POSITION. MOVEMENT OF THE AIRCRAFT CAN BE DANGEROUS.

CAUTION: DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.

(1) For identification of the PTU Status Symbols refer to Para. Operation/Control and Indicating (Ref. AMM D/O 29-23-00-00).
(2) To prevent damage to the PTU:

Make sure that the air pressure in the Green and Yellow reservoirs does not decrease to less than 3 bar (43.5113 psi).

(3) Make sure that the isolation coupling of the PTU is connected.
(4) Make sure that the nose wheel steering operates.
(5) Make sure that the PTU P/BSW on the panel 40VU is in the AUTO position (OFF light is not on).
(6) Do this test:

NOTE: During EDP and PTU operation a transient flow demand (PTU runs in saw tooth mode) leads to interaction with the EDP pressure compensator and can cause system pressure peaks. These pressure peaks are permitted if they are not above 3350psi.

ACTION	RESULT
1.Start the right engine to pressurize the Yellow hydraulic system (Ref. AMM TASK 71-00-00-710-003).
Start the left engine (Ref. AMM TASK 71-00-00-710-003).	On the ECAM lower DU: During the start-up of the left engine, the pressure in the Yellow hydraulic system is between 2900 and 3100 psi. During the start-up of the left engine, the pressure in the Green hydraulic system is between 2200 and 3150 psi. After the start-up of the left engine, when the engine operates at idle, the pressure in the Green hydraulic system is between 2900 and 3100 psi. With the left and the right engines at idle, the PTU does not operate.
2.On the panel 40VU:	On the panel 40VU:
Push the GREEN/ENG 1 PUMP P/BSW.	The GREEN/ENG 1 PUMP OFF light comes on. the PTU starts to supply hydraulic power from the Yellow to the Green hydraulic system.
	The ECAM lower DU shows:
	The pressure in the Green hydraulic system is between 2200 and 3150 psi. NOTE: When the PTU starts, the pressure in the Yellow hydraulic system can decrease to 2000 psi for a short time. The PTU stops when the pressure in the Green hydraulic system is between 2800 and 3150 psi. The PTU starts again when the pressure in the Green hydraulic system is between 2200 and 2850 psi. NOTE: The PTU operates intermittently between the given limits. If the PTU operates continuously, do a leakage check of the Green hydraulic system (Ref. AMM TASK 29-00-00-280-001).
3.Push the left rudder pedal (on one of the two rudder pedal pairs) and then the right rudder pedal fully forward, to operate the rudder. Do this again, for not less than five times.	On the ECAM lower DU: The pressure in the Green hydraulic system is between 2200 and 3150 psi. NOTE: The PTU transfer line can go out of view during the test (PTU transfer line reset), which is a normal ECAM indication behavior.
4.Put the rudder pedals in the neutral position.
5.On the panel 40VU:	On the panel 40VU:
Press the GREEN/ENG 1 PUMP P/BSW.	The GREEN/ENG 1 PUMP OFF light goes off.
	On the ECAM lower DU: The PTU stops. The pressure in the Green hydraulic system is between 2900 and 3100 psi.
6.On the panel 40VU:	On the panel 40VU:
Push the PTU P/BSW.	The PTU P/BSW OFF light comes on.
7.On the panel 40VU:	On the panel 40VU:
Press the YELLOW/ENG 2 PUMP P/BSW.	The YELLOW/ENG 2 PUMP OFF light comes on.
8.On the ECAM lower DU: Let the pressure in the Yellow hydraulic system decrease to 200 psi or less.
9.On the panel 40VU:	On the panel 40VU:
Push the PTU P/BSW.	The PTU P/BSW OFF light goes off.
	The PTU starts to supply hydraulic power from the Green to the Yellow hydraulic system.
	The ECAM lower DU shows: The pressure in the Yellow hydraulic system is between 2200 and 3150 psi. NOTE: When the PTU starts, the pressure in the Green hydraulic system can decrease to 2000 psi for a short time. The PTU stops when the pressure in the Yellow hydraulic system is between 2800 and 3150 psi. The PTU starts again when the pressure in the Yellow hydraulic system is between 2200 and 2850 psi. NOTE: The PTU operates intermittently between the given limits. If the PTU operates continuously, do a leakage check of the Yellow hydraulic system (Ref. AMM TASK 29-00-00-280-003).
10.Push the left rudder pedal (on one of the two rudder pedal pairs) and then the right rudder pedal fully forward, to operate the rudder. Do this again, for not less than five times.	On the ECAM lower DU: The pressure in the Yellow hydraulic system is between 2200 and 3150 psi. NOTE: The PTU transfer line can go out of view during the test (PTU transfer line reset), which is a normal ECAM indication behavior.
11.Put the rudder pedals in the neutral position.
12.On the panel 40VU:	On the panel 40VU:
Press the YELLOW/ENG 2 PUMP P/BSW.	The YELLOW/ENG 2 PUMP OFF light goes off. The PTU stops.
	On the ECAM lower DU: The pressure in the Yellow hydraulic system is between 2900 and 3100 psi.
13.Make sure that the parking brake is set to "OFF" and the towing lever is not in the towing position. Operate the brake pedals if necessary.
14.Stop the left engine to depressurize the Green hydraulic system (Ref. AMM TASK 71-00-00-710-028).	The PTU starts and pressurizes the Green hydraulic system.
	On the ECAM lower DU: The pressure in the Green hydraulic system is between 2200 and 3150 psi.
15.On the panel 40VU:	On the panel 40VU:
Push the PTU P/BSW.	The OFF light of the PTU P/BSW comes on.
	On the ECAM lower DU: The display shows the PTU set to OFF. The pressure in the Green hydraulic system is 0 psi.
16.Stop the right engine to depressurize the Yellow hydraulic system (Ref. AMM TASK 71-00-00-710-028).	On the ECAM lower DU: The pressure in the Yellow hydraulic system is 0 psi.

Subtask 29-23-00-710-054-B ** ON A/C NOT FOR ALL

A. Operational Test of the PTU with the Engine Pumps

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 WHEEL CHOCKS ARE IN POSITION. MOVEMENT OF THE AIRCRAFT CAN BE DANGEROUS.

CAUTION: DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.

(1) For identification of the PTU Status Symbols refer to Para. Operation/Control and Indicating (Ref. AMM D/O 29-23-00-00).
(2) To prevent damage to the PTU:

Make sure that the air pressure in the Green and Yellow reservoirs does not decrease to less than 3 bar (43.5113 psi).

ACTION	RESULT
1.Start the right engine to pressurize the Yellow hydraulic system (Ref. AMM TASK 71-00-00-710-003).
Start the left engine (Ref. AMM TASK 71-00-00-710-003).	On the ECAM lower DU: During the start-up of the left engine, the pressure in the Yellow hydraulic system is between 2900 and 3100 psi. During the start-up of the left engine, the pressure in the Green hydraulic system is between 2200 and 3150 psi. After the start-up of the left engine, when the engine operates at idle, the pressure in the Green hydraulic system is between 2900 and 3100 psi. With the left and the right engines at idle, the PTU does not operate.
2.On the panel 40VU:	On the panel 40VU:
Push the GREEN/ENG 1 PUMP P/BSW.	The GREEN/ENG 1 PUMP OFF light comes on. The PTU starts to supply hydraulic power from the Yellow to the Green hydraulic system.
	The ECAM lower DU shows:
	The pressure in the Green hydraulic system is between 2200 and 3150 psi. NOTE: When the PTU starts, the pressure in the Yellow hydraulic system can decrease to 2000 psi for a short time. The PTU stops when the pressure in the Green hydraulic system is between 2800 and 3150 psi. The PTU starts again when the pressure in the Green hydraulic system is between 2200 and 2850 psi. NOTE: The PTU operates intermittently between the given limits. If the PTU operates continuously, do a leakage check of the Green hydraulic system (Ref. AMM TASK 29-00-00-280-001).
3.Push the left rudder pedal (on one of the two rudder pedal pairs) and then the right rudder pedal fully forward, to operate the rudder. Do this again, for not less than five times.	On the ECAM lower DU: The pressure in the Green hydraulic system is between 2200 and 3150 psi. NOTE: The PTU transfer line can go out of view during the test (PTU transfer line reset), which is a normal ECAM indication behavior.
4.Put the rudder pedals in the neutral position.
5.On the panel 40VU:	On the panel 40VU:
Press the GREEN/ENG 1 PUMP P/BSW.	The GREEN/ENG 1 PUMP OFF light goes off.
	On the ECAM lower DU: The PTU stops. The pressure in the Green hydraulic system is between 2900 and 3100 psi.
6.On the panel 40VU:	On the panel 40VU:
Push the PTU P/BSW.	The PTU P/BSW OFF light comes on.
7.On the panel 40VU:	On the panel 40VU:
Press the YELLOW/ENG 2 PUMP P/BSW.	The YELLOW/ENG 2 PUMP OFF light comes on.
8.On the ECAM lower DU: Let the pressure in the Yellow hydraulic system decrease to 200 psi or less.
9.On the panel 40VU:	On the panel 40VU:
Push the PTU P/BSW.	The PTU P/BSW OFF light goes off.
	The PTU starts to supply hydraulic power from the Green to the Yellow hydraulic system.
	The ECAM lower DU shows: The pressure in the Yellow hydraulic system is between 2200 and 3150 psi. NOTE: When the PTU starts, the pressure in the Green hydraulic system can decrease to 2000 psi for a short time. The PTU stops when the pressure in the Yellow hydraulic system is between 2800 and 3150 psi. The PTU starts again when the pressure in the Yellow hydraulic system is between 2200 and 2850 psi. NOTE: The PTU operates intermittently between the given limits. If the PTU operates continuously, do a leakage check of the Yellow hydraulic system (Ref. AMM TASK 29-00-00-280-003).
10.Push the left rudder pedal (on one of the two rudder pedal pairs) and then the right rudder pedal fully forward, to operate the rudder. Do this again, for not less than five times.	On the ECAM lower DU: The pressure in the Yellow hydraulic system is between 2200 and 3150 psi. NOTE: The PTU transfer line can go out of view during the test (PTU transfer line reset), which is a normal ECAM indication behavior.
11.Put the rudder pedals in the neutral position.
12.On the panel 40VU:	On the panel 40VU:
Press the YELLOW/ENG 2 PUMP P/BSW.	The YELLOW/ENG 2 PUMP OFF light goes off. The PTU stops.
	On the ECAM lower DU: The pressure in the Yellow hydraulic system is between 2900 and 3100 psi.
13.Make sure that the parking brake is set to "OFF" and the towing lever is not in the towing position. Operate the brake pedals if necessary.
14.Stop the left engine to depressurize the Green hydraulic system (Ref. AMM TASK 71-00-00-710-028).	The PTU starts and pressurizes the Green hydraulic system.
	On the ECAM lower DU: The pressure in the Green hydraulic system is between 2200 and 3150 psi.
15.On the panel 40VU:	On the panel 40VU:
Push the PTU P/BSW.	The OFF light of the PTU P/BSW comes on.
	On the ECAM lower DU: The display shows the PTU set to OFF. The pressure in the Green hydraulic system is 0 psi.
16.Stop the right engine to depressurize the Yellow hydraulic system (Ref. AMM TASK 71-00-00-710-028).	On the ECAM lower DU: The pressure in the Yellow hydraulic system is 0 psi.

Subtask 29-23-00-710-054-C ** ON A/C NOT FOR ALL

A. Operational Test of the PTU with the Engine Pumps

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 WHEEL CHOCKS ARE IN POSITION. MOVEMENT OF THE AIRCRAFT CAN BE DANGEROUS.

CAUTION: DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.

(1) For identification of the PTU Status Symbols refer to Para. Operation/Control and Indicating (Ref. AMM D/O 29-23-00-00).
(2) To prevent damage to the PTU:

Make sure that the air pressure in the Green and Yellow reservoirs does not decrease to less than 3 bar (43.5113 psi).

ACTION	RESULT
1.Start the right engine to pressurize the Yellow hydraulic system (Ref. AMM TASK 71-00-00-710-043).
Start the left engine (Ref. AMM TASK 71-00-00-710-043).	On the ECAM lower DU: During the start-up of the left engine, the pressure in the Yellow hydraulic system is between 2900 and 3100 psi. During the start-up of the left engine, the pressure in the Green hydraulic system is between 2200 and 3150 psi. After the start-up of the left engine, when the engine operates at idle, the pressure in the Green hydraulic system is between 2900 and 3100 psi. With the left and the right engine at idle, the PTU does not operate.
2.On the panel 40VU:	On the panel 40VU:
Press the GREEN/ENG 1 PUMP P/BSW.	The GREEN/ENG 1 PUMP OFF light comes on. The PTU starts to supply hydraulic power from the Yellow to the Green hydraulic system.
	The ECAM lower DU shows:
	The pressure in the Green hydraulic system is between 2200 and 3150 psi. NOTE: When the PTU starts, the pressure in the Yellow hydraulic system can decrease to 2000 psi for a short time. The PTU stops when the pressure in the Green hydraulic system is between 2800 and 3150 psi. The PTU starts again when the pressure in the Green hydraulic system is between 2200 and 2850 psi. NOTE: The PTU operates intermittently between the given limits. If the PTU operates continuously, do a leakage check of the Green hydraulic system (Ref. AMM TASK 29-00-00-280-001).
3.Push the left rudder pedal (on one of the two rudder pedal pairs) and then the right rudder pedal fully forward, to operate the rudder. Do this again, for not less than five times.	On the ECAM lower DU: The pressure in the Green hydraulic system is between 2200 and 3150 psi. NOTE: The PTU transfer line can go out of view during the test (PTU transfer line reset), which is a normal ECAM indication behavior.
4.Put the rudder pedals in the neutral position.
5.On the panel 40VU:	On the panel 40VU:
Press the GREEN/ENG 1 PUMP P/BSW.	The GREEN/ENG 1 PUMP OFF light goes off.
	On the ECAM lower DU: The PTU stops. The pressure in the Green hydraulic system is between 2900 and 3100 psi.
6.On the panel 40VU:	On the panel 40VU:
Push the PTU P/BSW.	The PTU P/BSW OFF light comes on.
7.On the panel 40VU:	On the panel 40VU:
Press the YELLOW/ENG 2 PUMP P/BSW.	The YELLOW/ENG 2 PUMP OFF light comes on.
8.On the ECAM lower DU: Let the pressure in the Yellow hydraulic system decrease to 200 psi or less.
9.On the panel 40VU:	On the panel 40VU:
Push the PTU P/BSW.	The PTU P/BSW OFF light goes off.
	The PTU starts to supply hydraulic power from the Green to the Yellow hydraulic system.
	The ECAM lower DU shows: The pressure in the Yellow hydraulic system is between 2200 and 3150 psi. NOTE: When the PTU starts, the pressure in the Green hydraulic system can decrease to 2000 psi for a short time. The PTU stops when the pressure in the Yellow hydraulic system is between 2800 and 3150 psi. The PTU starts again when the pressure in the Yellow hydraulic system is between 2200 and 2850 psi. NOTE: The PTU operates intermittently between the given limits. If the PTU operates continuously, do a leakage check of the Yellow hydraulic system (Ref. AMM TASK 29-00-00-280-003).
10.Push the left rudder pedal (on one of the two rudder pedal pairs) and then the right rudder pedal fully forward, to operate the rudder. Do this again, for not less than five times.	On the ECAM lower DU: The pressure in the Yellow hydraulic system is between 2200 and 3150 psi. NOTE: The PTU transfer line can go out of view during the test (PTU transfer line reset), which is a normal ECAM indication behavior.
11.Put the rudder pedals in the neutral position.
12.On the panel 40VU:	On the panel 40VU:
Press the YELLOW/ENG 2 PUMP P/BSW.	The YELLOW/ENG 2 PUMP OFF light goes off. The PTU stops.
	On the ECAM lower DU: The pressure in the Yellow hydraulic system is between 2900 and 3100 psi.
13.Make sure that the parking brake is set to "OFF" and the towing lever is not in the towing position. Operate the brake pedals if necessary.
14.Stop the left engine to depressurize the Green hydraulic system (Ref. AMM TASK 71-00-00-710-018).	The PTU starts and pressurizes the Green hydraulic system.
	On the ECAM lower DU: The pressure in the Green hydraulic system is between 2200 and 3150 psi.
15.On the panel 40VU:	On the panel 40VU:
Push the PTU P/BSW.	The OFF light of the PTU P/BSW comes on.
	On the ECAM lower DU: The display shows the PTU set to OFF. The pressure in the Green hydraulic system is 0 psi.
16.Stop the right engine to depressurize the Yellow hydraulic system (Ref. AMM TASK 71-00-00-710-018).	On the ECAM lower DU: The pressure in the Yellow hydraulic system is 0 psi.

5. Close-up
Subtask 29-23-00-860-063-A

A. Put the aircraft back to the serviceable condition.
(1) Put the PTU P/BSW on the panel 40VU in the AUTO position (OFF light not on).
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 08:12:39 UTC