Functional Test of the Hydraulic Reservoir Pressurization System with the Left Engine

TASK 29-14-00-720-002-A
Functional Test of the Hydraulic Reservoir Pressurization System with the Left Engine

1. Reason for the Job
To make sure that the HP-air supply operates correctly.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	2	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
196BB, 197CB, 197EB, 197FB, 198CB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
TASK 32-12-00-010-001-A	Open the Main Gear Doors for Access
TASK 32-12-00-410-001-A	Close the Main Gear Doors after Access
TASK 71-00-00-710-003-B	Engine Automatic Start
TASK 71-00-00-710-003-A	Engine Automatic Start
TASK 71-00-00-710-018-A	Discontinued Start, Restart and Shutdown Procedures
TASK 71-00-00-710-028-B	Engine Shutdown
TASK 71-00-00-710-028-A	Engine Shutdown
TASK 71-00-00-710-043-A	Normal Engine Automatic-Start Procedure

3. Job Set-up
Subtask 29-14-00-010-059-A

A. Get Access
(1) Open the access doors 196BB 197CB 197EB 197FB 198CB.
(2) Open the right main door of the main landing gear (Ref. AMM TASK 32-12-00-010-001).

Subtask 29-14-00-860-052-A

B. Aircraft Maintenance Configuration
(1) Depressurize the Green, Yellow and Blue hydraulic systems and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(2) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the hydraulic system:

in the flight compartment near the hydraulic section 40VU of the overhead panel,
on the ground service panels of the Green, Yellow and Blue hydraulic systems.

Subtask 29-14-00-865-061-A

C. 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/HYD POWER/Y	3803GX	N30
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C ALL
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33
** ON A/C ALL
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

4. Procedure
Subtask 29-14-00-720-051-A ** ON A/C NOT FOR ALL

A. Do this test

ACTION	RESULT
1.On the ground service panels of the Green, Yellow and Blue hydraulic systems:
Open the depressurization valve and release the pressure in the reservoirs to 30 psi (2.0684 bar) (Ref. AMM TASK 29-14-00-614-001).
2.Start the left engine and set the N1 RPM to 80% for not less than 60s (Ref. AMM TASK 71-00-00-710-003).	On each reservoir air pressure gage:
	the pressure in the reservoirs increases to 50 psi (3.4474 bar).
3.Shut down the left engine (Ref. AMM TASK 71-00-00-710-028).	On each reservoir air pressure gage:
	the pressure in the reservoir stays constant at 50 psi (3.4474 bar).

Subtask 29-14-00-720-051-B ** ON A/C NOT FOR ALL

A. Do this test

ACTION	RESULT
1.On the ground service panels of the Green, Yellow and Blue hydraulic systems:
Open the depressurization valve and release the pressure in the reservoirs to 30 psi (2.0684 bar) (Ref. AMM TASK 29-14-00-614-001).
2.Start the left engine and set the N1 RPM to 80% for not less than 60s (Ref. AMM TASK 71-00-00-710-003).	On each reservoir air pressure gage:
	the pressure in the reservoirs increases to 50 psi (3.4474 bar).
3.Shut down the left engine (Ref. AMM TASK 71-00-00-710-028).	On each reservoir air pressure gage:
	the pressure in the reservoir stays constant at 50 psi (3.4474 bar).

Subtask 29-14-00-720-051-C ** ON A/C NOT FOR ALL

A. Do this test

ACTION	RESULT
1.On the ground service panels of the Green, Yellow and Blue hydraulic systems:
Open the depressurization valve and release the pressure in the reservoirs to 30 psi (2.0684 bar) (Ref. AMM TASK 29-14-00-614-001).
2.Start the left engine and set the N1 RPM to 30% for not less than 60s (Ref. AMM TASK 71-00-00-710-043).	On each reservoir air pressure gage:
	the pressure in the reservoirs increases to 50 psi (3.4474 bar).
3.Shut down the left engine (Ref. AMM TASK 71-00-00-710-018).	On each reservoir air pressure gage:
	the pressure in the reservoir stays constant at 50 psi (3.4474 bar).

5. Close-up
Subtask 29-14-00-410-058-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right main door of the main landing gear (Ref. AMM TASK 32-12-00-410-001).
(3) Close the access doors 196BB 197CB 197EB 197FB 198CB.
(4) Remove the warning notices from:

the flight compartment,
the ground service panels of the Green, Yellow and Blue hydraulic systems.

Subtask 29-14-00-865-062-A

B. 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
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/HYD POWER/Y	3803GX	N30
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C ALL
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37
121VU	HYDRAULIC/Y HYD/PUMP ENG2/CTL	3701GD	Q36
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/HYD POWER/Y	3803GX	N31
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33
** ON A/C ALL
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

[Rev.10 from 2021] 2026.04.01 00:24:12 UTC