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Ground Connector
Filter
Water Separator
Reservoir Check Valves
Pressure Gage
Pressure Relief Valve
Manual Depressurization Valve
Self Examination
TMUHYDE05 LEVEL 3
EFFECTIVITY 29-14-00 Page 1
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 69
ALL
HYDRAULIC RESERVOIR PRESSURIZING SYSTEM D/O
GENERAL
An air pressure system is provided to pressurize each
hydraulic reservoir in order to ensure adequate fluid
supply to the pumps.
Each reservoir is pressurized by air at 50 psi (3.5
bar). The system also remains airtight in the event
of pressurization system failure or after engine
shutdown.
SOURCES
The pressure sources are engine 1, via a restrictor
or both engines and the APU, via the pneumatic
manifold. The pressure sources are:
- the engine 1 HP compressor (usual operation).
- the pneumatic system in case of loss of engine1.
- the ground supply.
RESTRICTOR
A restrictor limits the airflow and reduces the
temperature of the high pressure air to a satisfactory
level.
The restrictor also prevents too much bleed air leakage
in case of a leak downstream of the restrictor.
RESERVOIR PRESSURIZATION UNIT
The reservoir pressurization unit (RPU) controls the
pressure of the air supplied to the reservoirs.
PRESSURE REDUCING VALVE
A pressure reducing valve is fitted to the reservoir
pressurization unit.
In normal operation, the delivery pressure of engine
1 has priority over the pressure supply from the
pneumatic manifold.
Pressure reducing valve outlet pressure: 50 psi (3.5
bar).
Two check valves prevent any reverse flow.
GROUND CONNECTOR
Pressurized air from a ground supply cart goes directly
to the reservoir pressurization unit through a ground
connector.
FILTER
A filter fitted with a clogging indicator is installed
in the reservoir pressurization unit to filter the air
from the different supply sources.
WATER SEPARATOR
A water separator is installed on the reservoir
pressurization unit. It makes sure that the air
delivered to the reservoirs is clear of any fluid.
There are two drain valves which prevent freezing of
the water in the RPU.One is an automatic drain valve
which is opened after each engine or APU shutdown, the
other one is a manual self-sealing drain valve.
TMUHYDE05-T01 LEVEL 3
EFFECTIVITY 29-14-00 Page 2
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 70
ALL
HYDRAULIC RESERVOIR PRESSURIZING SYSTEM D/O
TMUHYDE05-P01 LEVEL 3
EFFECTIVITY 29-14-00 Page 3
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 71
ALL
HYDRAULIC RESERVOIR PRESSURIZING SYSTEM D/O
RESERVOIR CHECK VALVES
Downstream of the reservoir pressurization unit, the
air supply is divided into three flows to supply the
reservoirs through their related check valve. The green
and yellow check valves are installed between the floor
beams above the hydraulic bay and the blue one is
installed in the Aft cargo compartment.
PRESSURE GAGE
An air pressure gage is installed on each hydraulic
reservoir to indicate the actual pressure. LOW AIR
PRESS warning is generated by the pressure switch if
the pressure is less than 22 psi (1.52 bar).
PRESSURE RELIEF VALVE
A pressure relief valve, installed on each reservoir,
relieves pressure to the atmosphere in the event of a
system overpressure.
The threshold of the pressure relief valve is 77 psi
(5.3 bar).
MANUAL DEPRESSURIZATION VALVE
A manual depressurization valve is fitted on each
ground service panel to depressurize each reservoir.
WARNING: When using the manual depressurization valve
put on eye protection and keep away from the
outlet of the valve.
The air can be hot and contain particles of
dust and/or hydraulic fluid.
TMUHYDE05-T01 LEVEL 3
EFFECTIVITY 29-14-00 Page 4
Apr 30/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 72
ALL
SELF EXAMINATION
When can the APU pressurize the reservoirs?
A - On ground only
B - In flight only
C - A and B
What are the manual depressurization valves
provided for?
A - Individual reservoir depressurization
　
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