Pressurize the Yellow Hydraulic System with the Electric Pump

TASK 29-24-00-863-001-A
Pressurize the Yellow Hydraulic System with the Electric Pump

WARNING: MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM. UNWANTED MOVEMENT OF HYDRAULICALLY OPERATED ITEMS CAN CAUSE SERIOUS INJURY AND/OR DAMAGE.

WARNING: PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.

NOTE: The simulation of in-flight conditions while Green and Yellow hydraulic systems are off can cause an inhibition of PTU.

FIN: 3075GX

1. Reason for the Job
To pressurize the Yellow hydraulic system with the Yellow electric pump, for maintenance procedures.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Referenced Information

REFERENCE	DESIGNATION
TASK 12-12-29-611-001-A	Fill the Hydraulic Fluid Reservoir with a Hand Pump
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 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 29-23-00-860-001-A	Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU)
TASK 31-60-00-860-001-A	EIS Start Procedure
Indications and Controls of the Yellow Hydraulic System

3. Job Set-up
Subtask 29-24-00-860-052-A

A. Aircraft Maintenance Configuration
(1) Energize the electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 29-24-00-865-057-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	PTU INHIT/Y SYS	1808GL	Q33
121VU	PTU INHIT/G SYS	1807GL	Q32
** ON A/C NOT FOR ALL
121VU	HYDRAULIC / PTU FLT INHIB	1825GL	Q31
** ON A/C NOT FOR ALL
121VU	HYDRAULIC-PTU FLT INHIT	1825GL	Q32

Subtask 29-24-00-860-060-A

C. Aircraft Maintenance Configuration
(1) Set the Electronic Centralized Aircraft Monitor (ECAM) to on (Ref. AMM TASK 31-60-00-860-001).
(2) On the ECAM control panel on the center pedestal, push the HYD pushbutton switch (P/BSW). Make sure that the ECAM lower Display Unit (DU) shows the HYD page.
(3) Make sure that the ECAM does not show any of these conditions:

Low air pressure in the Yellow reservoir,
Low fluid level in the reservoirs.

(4) In addition, if you will operate the PTU, make sure that these conditions are also not shown on the ECAM:

Low air pressure in the Green reservoir,
Low fluid level in the Green reservoir.

(5) If necessary, pressurize the reservoir(s) (Ref. AMM TASK 29-14-00-614-002).
(6) If necessary, add fluid to the reservoir(s) (Ref. AMM TASK 12-12-29-611-001).

Subtask 29-24-00-865-050-A

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

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

4. Procedure
Subtask 29-24-00-863-050-A

A. Pressurization with the Electric Pump
(1) If it is necessary to use the Yellow hydraulic system only, continue as follows:

NOTE: Usually the PTU automatically pressurizes the Green hydraulic system together with the Yellow hydraulic system. If you pressurize the Yellow system only,then it is necessary to stop the operation of the PTU.

(a) Disconnect the isolation coupling of the Power Transfer Unit (PTU) (Ref. AMM TASK 29-23-00-860-001)

NOTE: Disconnection of the isolation coupling is only necessary if the system on the opposite side is disconnected for maintenance.

(b) Press and release the PTU/AUTO pushbutton switch 1802GL on the overhead panel 40VU.
(c) Make sure that the OFF legend comes on.
(2) On the overhead panel 40VU, push and release the YELLOW ELEC PUMP pushbutton switch 3804GX.
(3) Make sure that the ON legend comes on.
(4) Make sure that the Yellow electric pump starts.
(5) On the lower DU of the ECAM, make sure that the YELLOW hydraulic system has a pressure of approximately 3000 psi.

NOTE: If the ECAM system is not available, you can check the pressure of 3000 +/-100 psi on the Yellow power accumulator (3070GM).

NOTE: To prevent a possible overheating of the hydraulic fluid, operate the electric pump only as long as it is necessary to do your maintenance procedure.

5. Close-up
Subtask 29-24-00-865-058-A

A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	PTU INHIT/Y SYS	1808GL	Q33
121VU	PTU INHIT/G SYS	1807GL	Q32
** ON A/C NOT FOR ALL
121VU	HYDRAULIC / PTU FLT INHIB	1825GL	Q31
** ON A/C NOT FOR ALL
121VU	HYDRAULIC-PTU FLT INHIT	1825GL	Q32

[Rev.10 from 2021] 2026.04.01 00:26:51 UTC