(2)
 Depressurize the Green, Yellow and Blue hydraulic systems (Ref. TASK 29-10-00-864-001), (Ref. TASK 29-10-00-864-002), (Ref. TASK 29-10-00-864-003).

 (3)
 Remove the blanking cap and connect the FILL UNIT - AIR (98D29003501000) to the charging valve on the air manifold.

 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 (75 psi) and it must have a filter. The filter must have a filtration rating of 5 microns or better.
 (4)
 Pressurize the reservoirs to 50 psig.

 (5)
 Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).

 (6)
 Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only) (Ref. 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.

 4. Procedure
_________ Subtask 29-34-00-710-051
 A. Operational Test of the Reservoir Low Air Pressure Warning
 (1) Observe the subsequent warnings: 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.
 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  - the air is released from the
 depressurizing valve to OPEN.  reservoir of the Green hydraulic system. When the pressure decreases to 22 +2 -2 psig, these warnings occur: - the single chime operates - On the panel 40VU on the overhead panel - the PTU/FAULT light comes on, - the ENG 1 PUMP/FAULT light comes
 on.
 - On the 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 ground service panel of the Green hydraulic system:
 - set the reservoir
 depressurizing valve to CLOSED.
 3. Pressurize the reservoir to 50 psig.  - The pressure in the reservoir of theGreen hydraulic system increases to 50 psig. - When the pressure increases to 25 psig, all of the above warnings are no longer shown.
 4. On the ground service panel of the Blue hydraulic system:
 - set the reservoir  - The air is released from the
 depressurizing valve to OPEN  reservoir of the Blue hydraulic system

 -------------------------------------------------------------------------------
ACTION RESULT -------------------------------------------------------------------------------
5. On the ground service panel of the Blue hydraulic system:
 -set the reservoir depressurizing valve to CLOSED.
 6.
 Pressurize the reservoir to 50 psig.

7.
 On the ground service panel of the Yellow hydraulic system:

 -set the reservoir depressurizing valve to OPEN.
-When the pressure decreases to 22 +2 -2 psig, these warnings occur:
 -the single chime operates
 -
On the panel 40VU on the overhead panel:

 -the BLUE/ELEC PUMP/FAULT lights come on

 -
On the 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
-The pressure in the reservoir of theBlue hydraulic system increases to 50 psig.
 -When the pressure increases to 25 psig, all of the warnings given in step 4 are no longer shown.
-The air is released from the Yellowsystem reservoir.
 -When the air pressure decreases to 22 +2 -2 psig, these warnings occur:
 -the single chime operates
 -
On the panel 40VU on the overhead panel:

 -
the PTU/FAULT light comes on,

 -
the ENG 2 PUMP/FAULT light comes on.

 -
On the panels 130VU and 131VU on the glareshield:

 -the MASTER CAUT lights come on.
　
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