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normal operation, the delivery pressure of engine 1
has priority over the pressure supply from the
pneumatic manifold.
Pressure reducing valve outlet pressure : 50psi(3,5
bar).
RESERVOIR PRESSURIZATION GROUND CONNECTOR
The connector is plunger-type valve. It is manually
opened or closed by rotating the nut which moves the
plunger.
The cap prevents external contamination.
TMUHYDZ03-T02 LEVEL 3
EFFECTIVITY 29-14-00 Page 4
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
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HYDRAULIC RESERVOIR PRESSURIZING SYSTEM COMPONENTS
TMUHYDZ03-P02 LEVEL 3
EFFECTIVITY 29-14-00 Page 5
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HYDRAULIC RESERVOIR PRESSURIZING SYSTEM COMPONENTS
RESTRICTOR
IDENTIFICATION
FIN: 1392GM
LOCATION
ZONE: 476
DESCRIPTION
The restrictor valve is installed in the HP air supply
line from the left engine.
It has a calibrated orifice which restricts the
airflow.
A filter element prevents contamination of the valve.
TMUHYDZ03-T03 LEVEL 3
EFFECTIVITY 29-14-00 Page 6
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
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HYDRAULIC RESERVOIR PRESSURIZING SYSTEM COMPONENTS - RESTRICTOR
TMUHYDZ03-P03 LEVEL 3
EFFECTIVITY 29-14-00 Page 7
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THIS PAGE INTENTIONALLY LEFT BLANK
TMUHYDZ03 LEVEL 3
EFFECTIVITY 29-14-00 Page 8
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29 - HYDRAULIC POWER
29-23-00 POWER TRANSFER UNIT COMPONENTS
CONTENTS:
Power Transfer Unit (PTU)
Yellow PTU Manifold
Green PTU Manifold
Isolation Coupling
TMUHYDG03 LEVEL 3
EFFECTIVITY 29-23-00 Page 1
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
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POWER TRANSFER UNIT COMPONENTS
POWER TRANSFER UNIT (PTU)
IDENTIFICATION
FIN: 1088GM
LOCATION
ZONE: 148
COMPONENT DESCRIPTION
There are three hydraulic connections on both sides
of the PTU:
- High Pressure
- Low Pressure
- Case drain
The high pressure and case drain connections on the
PTU are of the standard type union. Only the low
pressure connections are self-sealing quick release
couplings.
YELLOW PTU MANIFOLD
IDENTIFICATION
FIN: 3113GM
LOCATION
ZONE: 148
COMPONENT DESCRIPTION
The yellow high pressure manifold is connected to the
PTU through the yellow PTU manifold. The yellow PTU
manifold also has a connection to the flap system.
SOLENOID VALVE
IDENTIFICATION
FIN: 3112GL
LOCATION
ZONE: 147
COMPONENT DESCRIPTION
It is installed in the PTU supply line, this solenoid
valve operates at the same time with the other solenoid
valve (1012GL) installed on the green PTU manifold.
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: 3064GM
LOCATION
ZONE: 147
COMPONENT DESCRIPTION
The yellow 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.
TMUHYDG03-T01 LEVEL 3
EFFECTIVITY 29-23-00 Page 2
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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POWER TRANSFER UNIT COMPONENTS - PTU - YELLOW PTU MANIFOLD
TMUHYDG03-P01 LEVEL 3
EFFECTIVITY 29-23-00 Page 3
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POWER TRANSFER UNIT COMPONENTS
GREEN PTU MANIFOLD
IDENTIFICATION
FIN: 1113GM
LOCATION
ZONE: 146
COMPONENT DESCRIPTION
The green high pressure manifold is connected to the
　
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