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PTU through the green PTU manifold.
SOLENOID VALVE
IDENTIFICATION
FIN: 1112GL
LOCATION
ZONE: 146
COMPONENT DESCRIPTION
It is installed in the PTU supply line.
When the solenoid is energized the valve closes.
When the solenoid valve is de-energized, the spool
moves to open the valve.
PRIORITY VALVE
IDENTIFICATION
FIN: 1064GM
LOCATION
ZONE: 146
COMPONENT DESCRIPTION
The green priority valve is installed on the PTU
manifold.
It is used to isolate the secondary flight controls
from pressure supply in case of low hydraulic pressure.
BRAKE SELECTOR VALVE
IDENTIFICATION
FIN: 23GG
LOCATION
ZONE: 146
COMPONENT DESCRIPTION
It allows the normal braking system to be pressurized.
It is fitted to the Green PTU manifold.
TMUHYDG03-T02 LEVEL 3
EFFECTIVITY 29-23-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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POWER TRANSFER UNIT COMPONENTS - GREEN PTU MANIFOLD
TMUHYDG03-P02 LEVEL 3
EFFECTIVITY 29-23-00 Page 5
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UF94200
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POWER TRANSFER UNIT COMPONENTS
ISOLATION COUPLING
IDENTIFICATION
FIN: 3701GM
LOCATION
ZONE: 148
COMPONENT DESCRIPTION
It is the only way to isolate the PTU for maintenance
operations. There is no transfer of power between the
two systems (green and yellow) when the isolation
coupling is disconnected.
TMUHYDG03-T03 LEVEL 3
EFFECTIVITY 29-23-00 Page 6
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
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POWER TRANSFER UNIT COMPONENTS - ISOLATION COUPLING
TMUHYDG03-P03 LEVEL 3
EFFECTIVITY 29-23-00 Page 7
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THIS PAGE INTENTIONALLY LEFT BLANK
TMUHYDG03 LEVEL 3
EFFECTIVITY 29-23-00 Page 8
Sep 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
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29 - HYDRAULIC SYSTEM
29-14-00 RESERVOIR PRESSURIZATION
CONTENTS:
Depressurization Operation
Pressurization Operation
TMUHYDO01 LEVEL 3
EFFECTIVITY 29-14-00 Page 1
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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RESERVOIR PRESSURIZATION
DEPRESSURIZATION OPERATION
Each hydraulic reservoir can be depressurized
independently.
Open the ground service panel access door.
In the cockpit, open, safety and tag the circuit
breakers.
To depressurize the hydraulic reservoir, ground
equipment may be used.
If it is not, on the ground service panel, turn the
assembly of the reservoir depressurization valve
clockwise through 90 degrees.
WARNING
Pay attention, protect your hands and face from the
air which comes out when you open reservoir manual
depressurization valves.
The air may be hot and contain hydraulic fluid.
Reservoir air pressure can be monitored on the
reservoir pressure gauge.
Keep the depressurization valve open if it is necessary
to depressurize a reservoir during a maintenance
operation. This prevents accidental pressurization of
a completed.
Close the depressurization valve when the maintenance
operation is completed.
TMUHYDO01-T01 LEVEL 3
EFFECTIVITY 29-14-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
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RESERVOIR PRESSURIZATION
PRESSURIZATION OPERATION
To pressurize the reservoir, make sure that the
depressurization valve is closed.
Note that the three hydraulic reservoirs are
pressurized through the air pressure manifold, thus
they are pressurized at the same time.
Open the blue hydraulic compartment door to gain access
to the air pressure manifold.
Remove the cap from the ground connector.
Connect the pressurizing tool to the ground connector.
Turn the nut to open the ground connector valve.
Fill the reservoir with air until 50 psi is shown on
　
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