Operational Test of Reservoir Low Air Pressure Warning

TASK 29-34-00-710-001-A
Operational Test of Reservoir Low Air Pressure Warning

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

ZONE: 195
ZONE: 196
ZONE: 197
ZONE: 198
ZONE: 210

1. Reason for the Job
Refer to the MPD TASK: 293400-01
OPERATIONAL CHECK OF RESERVOIR LOW AIR PRESSURE WARNING
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
97A29102035000	1	CONNECTOR-PRESSURIZING,HYDRAULIC TANK
98D29003501000	1	FILL UNIT-AIR PRESSURIZING TOOL, HYDRAULIC RESERVOIR
98D29003501003	1	FILL UNIT - AIR

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
195	HYDRAULIC COMPT AND FAIRINGS
196	HYDRAULIC COMPT AND FAIRINGS
197	REAR FAIRING
198	REAR FAIRING
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
195BB, 196BB, 197CB, 197EB, 197FB, 198CB

C. Referenced Information

REFERENCE	DESIGNATION
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 29-10-00-864-001-A	Depressurize the Green Hydraulic System
TASK 29-10-00-864-002-A	Depressurize the Yellow Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-14-18-000-001-A	Removal of the Reservoir Pressure Check Valves
TASK 29-14-18-400-001-A	Installation of the Reservoir Pressure Check Valves
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
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
Air-Charging Ground Connector ** ON A/C NOT FOR ALL
Air-Charging Ground Connector ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 29-34-00-010-052-A

A. Get Access
(1) Open the access doors 197CB 197EB 197FB 195BB 196BB 198CB.
(2) Open one door of the main landing gear (Ref. AMM TASK 32-12-00-010-001).

NOTE: You can open any one of the two doors, but access is better from the right side.

Subtask 29-34-00-865-054-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
123VU	B HYD/ELEC PUMP	2701GJ	AB09
123VU	Y HYD/ELEC/PUMP	3802GX	AB06
123VU	Y HYD/ELEC/ELEC PUMP/NORM	3801GX	AB03

Subtask 29-34-00-865-056-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R34
** ON A/C ALL
121VU	HYDRAULIC/Y HYD/PUMP ENG2/MONG	3700GD	Q37
** ON A/C NOT FOR ALL
121VU	HYDRAULIC/G HYD/PUMP ENG1/MONG	1702GK	R33

Subtask 29-34-00-860-053-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration

Air-Charging Ground Connector ** ON A/C NOT FOR ALL

(1) Put the WARNING NOTICE(S) in position on the ground service panels of the Green, Blue and Yellow hydraulic systems to tell persons not to pressurize the hydraulic systems.
(2) Depressurize the Green, Yellow and Blue hydraulic systems (Ref. AMM TASK 29-10-00-864-001), (Ref. AMM TASK 29-10-00-864-002) and (Ref. AMM TASK 29-10-00-864-003).
(3) Remove the blanking cap and connect the 98D29003501000 FILL UNIT-AIR PRESSURIZING TOOL, HYDRAULIC RESERVOIR or 98D29003501003 FILL UNIT - AIR to air-charging ground connector 1391GM on air pressurization manifold 1370GM.

NOTE: If the pressurizing tool is not available, it is possible to use an alternative source for a supply of air. The supply must have a pressure not higher than 5 bar (73 psi) and it must have a filter. The filter must have a filtration rating of 5 microns or better.
As alternative to the air source, you can use the nitrogen source with 97A29102035000 CONNECTOR-PRESSURIZING,HYDRAULIC TANK.

(4) Pressurize the reservoirs to 50 psig.
(5) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(6) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(7) On the ECAM control panel on the center pedestal push the HYD pushbutton switch (P/BSW). Make sure that the HYD page is shown on the lower (system) display of the ECAM.

Subtask 29-34-00-860-053-B ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration

Air-Charging Ground Connector ** ON A/C NOT FOR ALL

Subtask 29-34-00-941-050-A

E. Safety Precautions
(1) On AIR COND overhead panel 30VU, make sure that:
(a) The APU BLEED pushbutton switch is released (the ON legend is off)
(b) The WARNING NOTICE(S) is in position to tell persons not to operate the APU.

4. Procedure
Subtask 29-34-00-710-051-A

A. Operational Test of the Reservoir Low Air Pressure Warning

WARNING: PROTECT YOUR HANDS AND FACE FROM THE GAS WHICH COMES OUT WHEN YOU OPEN THE MANUAL DEPRESSURIZATION VALVE OF THE RESERVOIRS. IT IS POSSIBLE THAT THE GAS IS HOT AND CONTAINS HYDRAULIC FLUID.

(1) Observe the subsequent warnings:

NOTE: To find the air pressure in a reservoir refer to the air pressure gage on the relevant reservoir.

NOTE: The FAULT lights on panel 40VU do not come on if the appropriate pushbutton switches are in the OFF position (OFF light on).

(2) Do this test:

ACTION	RESULT
1.On the ground service panel of the Green hydraulic system:
Set the reservoir depressurizing valve to OPEN.	The air is released from the reservoir of the Green hydraulic system. When the pressure decreases to 22 +2 -2 psig, these warnings occur: The single chime operates On panel 40VU on the overhead panel: The PTU/FAULT light comes on, The ENG 1 PUMP/FAULT light comes on. On panels 130VU and 131VU on the glareshield: The MASTER CAUT lights come on. On the lower ECAM display: The message LO AIR PRESS comes on near the Green hydraulic system indication.
2.On the top of the reservoir of the Blue hydraulic system, on pressure gauge 2383GM: The pressure in the reservoir of the Blue hydraulic system is 50 psig. NOTE: If the pressure in the reservoir is less than 50 psig, replace check valve 2388GM (Ref. AMM TASK 29-14-18-000-001) and (Ref. AMM TASK 29-14-18-400-001).
3.On the top of the reservoir of the Yellow hydraulic system, on pressure gauge 3383GM: The pressure in the reservoir of the Yellow hydraulic system is 50 psig. NOTE: If the pressure in the reservoir is less than 50 psig, replace check valve 3388GM (Ref. AMM TASK 29-14-18-000-001) and (Ref. AMM TASK 29-14-18-400-001).
4.On the ground service panel of the Green hydraulic system:
Set the reservoir depressurizing valve to CLOSED.
5.Pressurize the reservoir to 50 psig.	The pressure in the reservoir of the Green hydraulic system increases to 50 psig. When the pressure increases to 25 psig, all of the above warnings are no longer shown.
6.On the ground service panel of the Blue hydraulic system:
Set the reservoir depressurizing valve to OPEN.	The air is released from the reservoir of the Blue hydraulic system When the pressure decreases to 22 +2 -2 psig, these warnings occur: The single chime operates On panel 40VU on the overhead panel: The BLUE/ELEC PUMP/FAULT lights come on. On panels 130VU and 131VU on the glareshield: The MASTER CAUT lights come on. On the lower ECAM display: The message LO AIR PRESS comes on near the Blue hydraulic system indication.
7.On the top of the reservoir of the Green hydraulic system, on pressure gauge 1383GM: The pressure in the reservoir of the Green hydraulic system is 50 psig. NOTE: If the pressure in the reservoir is less than 50 psig, replace check valve 1388GM (Ref. AMM TASK 29-14-18-000-001) and (Ref. AMM TASK 29-14-18-400-001).
8.On the top of the reservoir of the Yellow hydraulic system, on pressure gauge 3383GM: The pressure in the reservoir of the Yellow hydraulic system is 50 psig. NOTE: If the pressure in the reservoir is less than 50 psig, replace check valve 3388GM (Ref. AMM TASK 29-14-18-000-001) and (Ref. AMM TASK 29-14-18-400-001).
9.On the ground service panel of the Blue hydraulic system: Set the reservoir depressurizing valve to CLOSED.
10.Pressurize the reservoir to 50 psig.	The pressure in the reservoir of the Blue hydraulic system increases to 50 psig. When the pressure increases to 25 psig, all of the warnings given in step 6 are no longer shown.
11.On the ground service panel of the Yellow hydraulic system:
Set the reservoir depressurizing valve to OPEN.	The air is released from the Yellow system reservoir. When the air pressure decreases to 22 +2 -2 psig, these warnings occur: The single chime operates. On panel 40VU on the overhead panel: The PTU/FAULT light comes on. The ENG 2 PUMP/FAULT light comes on. On panels 130VU and 131VU on the glareshield: The MASTER CAUT lights come on. On the lower ECAM display: The message LO AIR PRESS comes on near the Yellow hydraulic system indication.
12.On the top of the reservoir of the Green hydraulic system, on pressure gauge 1383GM: The pressure in the reservoir of the Green hydraulic system is 50 psig. NOTE: If the pressure in the reservoir is less than 50 psig, replace check valve 1388GM (Ref. AMM TASK 29-14-18-000-001) and (Ref. AMM TASK 29-14-18-400-001).
13.On the top of the reservoir of the Blue hydraulic system, on pressure gauge 2383GM: The pressure in the reservoir of the Blue hydraulic system is 50 psig. NOTE: If the pressure in the reservoir is less than 50 psig, replace check valve 2388GM (Ref. AMM TASK 29-14-18-000-001) and (Ref. AMM TASK 29-14-18-400-001).
14.On the ground service panel of the Yellow hydraulic system: Set the reservoir depressurizing valve to CLOSED.
15.Pressurize the reservoir to 50 psig.	The pressure in the resrvoir of the Yellow hydraulic system increases to 50 psig. When the pressure increases to 25 psig, all of the warning given in step 11 are no longer shown.

5. Close-up
Subtask 29-34-00-860-052-A

A. Put the aircraft back to the serviceable condition.

Air-Charging Ground Connector ** ON A/C NOT FOR ALL

(1) Disconnect the air supply from the reservoir air manifold.
(2) Install the blanking cap on air-charging ground connector 1391GM.
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Close the door of the main landing gear (Ref. AMM TASK 32-12-00-410-001).
(5) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(6) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(7) Remove the WARNING NOTICE(S).

Subtask 29-34-00-410-052-A

B. Close Access
(1) Close the access doors 197CB 197EB 197FB 195BB 196BB 198CB.

Subtask 29-34-00-865-055-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
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 00:28:03 UTC