Functional Check of the Power Transfer Unit (PTU) Green to Yellow

TASK 29-23-00-710-002-A
Functional Check of the Power Transfer Unit (PTU) Green to Yellow

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.

ZONE: 210
FIN: 1088GM

1. Reason for the Job
Refer to the MPD TASK: 291000-04
FUNCTIONAL CHECK OF PTU GREEN TO YELLOW
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD

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 29-00-00-870-001-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 29-10-00-863-001-A	Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
TASK 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
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 29-23-00-710-004-A	Operational Test of the Power Transfer Unit (PTU) with the Engine Pumps
TASK 29-24-00-863-001-A	Pressurize the Yellow Hydraulic System with the Electric Pump
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 29-23-00-00	POWER TRANSFER - DESCRIPTION AND OPERATION
PTU Indications

3. Job Set-up
Subtask 29-23-00-860-058-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 central pedestal, push the HYD P/BSW.
(4) Make sure that the HYD page of the ECAM lower Display Unit (DU) comes on.
(5) Make sure that the ECAM does not show one of 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) Make sure that the Yellow hydraulic system upstream of the engine pump is bled (Ref. AMM TASK 29-00-00-870-004).
(9) Make sure that the Yellow hydraulic system upstream of the PTU is bled (Ref. AMM TASK 29-00-00-870-005).
(10) Make sure that the Green hydraulic system upstream of the engine pump is bled (Ref. AMM TASK 29-00-00-870-001).
(11) Make sure that the Green hydraulic system upstream of the PTU is bled (Ref. AMM TASK 29-00-00-870-002).

Subtask 29-23-00-865-052-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 29-23-00-710-050-A

A. Functional Test of the PTU with the Yellow E-Pump and a Ground Hydraulic Supply

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.

CAUTION: DO NOT CONNECT GROUND POWER SUPPLIES TO THE GREEN AND YELLOW HYDRAULIC SYSTEMS AT THE SAME TIME. THIS COULD CAUSE:

THE PTU TO OPERATE TOO FAST
DAMAGE TO THE PTU IF ONE GROUND POWER SUPPLY IS IN OPERATION AND THE OTHER IS IN THE BY-PASS MODE.

(1) For identification of the PTU Status Symbols refer to Para. Operation/Control and Indicating (Ref. AMM D/O 29-23-00-00).
(2) As an alternative procedure, you can do the operational test of the PTU with the engine pumps (Ref. AMM TASK 29-23-00-710-004).
(3) 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).
Do not let the flow of the ground hydraulic supply increase to more than 76 l.min (20.0769 USgal.mn).

ACTION	RESULT
1.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.
2.Pressurize the Green hydraulic system with a ground hydraulic supply (Ref. AMM TASK 29-10-00-863-001).	On the ECAM lower DU: The pressure in the Green hydraulic system is between 2900 and 3100 psi, without a hydraulic consumer in operation. The pressure in the Yellow hydraulic system is 0 psi.
3.On the panel 40VU:	On the panel 40VU:
Push and release the PTU P/BSW.	The OFF light of the PTU P/BSW 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. NOTE: If the PTU operates continuously do a leakage check of the Yellow hydraulic system.
4.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 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 step.
5.Put the rudder pedals in the neutral position.
6.Pressurize the Yellow hydraulic system with the Yellow E-pump (Ref. AMM TASK 29-24-00-863-001).	The PTU stops.
7.Depressurize the Yellow hydraulic system (Ref. AMM TASK 29-10-00-864-002).	The PTU starts and pressurizes the Yellow hydraulic system The pressure in the Yellow hydraulic system is between 2200 and 3150 psi.
8.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 pressure in the Yellow hydraulic system is 0 psi.
9.Depressurize the Green hydraulic systems (Ref. AMM TASK 29-10-00-864-001).	The pressure in the Green hydraulic systems is 0 psi.
10.On the panel 40VU:	On the panel 40VU:
Push and release the PTU P/BSW.	The OFF light of the PTU P/BSW goes off.
	On the ECAM lower DU: The display shows the PTU set to AUTO.

5. Close-up
Subtask 29-23-00-860-059-A

A. Put the aircraft back to the serviceable condition.
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 00:26:41 UTC