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one temperature switch and two temperature
transducers.
The bypass operates when the differential pressure across
the filter is more than 29 ± 2.35 psi (2 ± 0.16 bar).
Temperature switch and temperature transducers send
data to the ECAM for warnings.
TMUHYDB03-T03 LEVEL 3
EFFECTIVITY 29-11-00 Page 6
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 42
ALL
GREEN HYDRAULIC SYSTEM D/O
TMUHYDB03-P03 LEVEL 3
EFFECTIVITY 29-11-00 Page 7
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 43
ALL
SELF EXAMINATION
When is the PTU operation inhibited?
A - Never, it cannot be inhibited.
B - Only if an engine failure has been
detected.
C - In case of cargo door operation with the
yellow electric pump.
When is the engine fire shut-off valve closed?
A - Automatically when the engine is shut
down.
B - If the ENG FIRE pushbutton is released
out.
C - Automatically as soon as engine fire is
detected.
TMUHYDB03 LEVEL 3
EFFECTIVITY 29-11-00 Page 8
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 44
ALL
29 - HYDRAULIC POWER
29-12-00 BLUE HYDRAULIC SYSTEM D/O
CONTENTS:
Reservoir
Reservoir Pressurization
Electric Pump
Ram Air Turbine
Pressure Switch
High Pressure Manifold
Leak Measurement Manifold
Return Manifold
Ground Couplings
Self Examination
TMUHYDC03 LEVEL 3
EFFECTIVITY 29-12-00 Page 1
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 45
ALL
BLUE HYDRAULIC SYSTEM D/O
Most of the system components are installed in the
blue hydraulic compartment located in the left hand
belly fairing, forward of the main landing gear
compartment.
RESERVOIR
The reservoir is equipped with a direct reading gauge,
a quantity indicator and a low level switch for ECAM
indicating and warning.
Normal fill level: 6l (1.58 US gal)
Maximum gaugeable level: 8l (2.11 US gal)
Low level warning: between 2.0 and 2.3l (0.52 and 0.6US
gal).
RESERVOIR PRESSURIZATION
The reservoir is normally pressurized with air to
prevent pump cavitation.
The reservoir is pressurized to 50 psi (3.43 bar) and
is sealed to hold the pressure when there is no air
supply.
The threshold of the air pressure switch is 22 psi
(1.52 bar).
ELECTRIC PUMP
With the ELEC PUMP pushbutton set to AUTO, the blue
electric pump will run, if one engine is running, or
BLUE PUMP OVRD pushbutton is set to ON, or Nose Landing
Gear is not compressed and AC power is available from
APU. With the last condition, at touch down a time
delay relay maintains the pump operation for two
minutes after nose landing gear compression.
The pump outlet pressure is 3000 psi (206 bar) at zero
flow.
A temperature switch sends a signal to the ECAM if the
pump body temperature exceeds 165°C.
The electric pump cooling and lubricating flow passes
through the case drain filter installed in the return
circuit.
TMUHYDC03-T01 LEVEL 3
EFFECTIVITY 29-12-00 Page 2
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 46
ALL
BLUE HYDRAULIC SYSTEM D/O
TMUHYDC03-P01 LEVEL 3
EFFECTIVITY 29-12-00 Page 3
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 47
ALL
BLUE HYDRAULIC SYSTEM D/O
RAM AIR TURBINE
The Ram Air Turbine (RAT) is deployed automatically
if all AC electrical power sources are lost at speeds
greater than 100Kts, or manually by using either of
the guarded pushbuttons.
PRESSURE SWITCH
The pressure switch monitors the electric pump pressure
for ECAM indications.
The threshold of the pressure switch is 1450 psi (99.5
bar).
A check valve stops the flow of fluid to the electric
pump if the system is pressurized by the RAT.
HIGH PRESSURE MANIFOLD
PRESSURE SWITCHES
The signals from both pressure switches are sent to
the ECAM system and to the Flight Control Computers.
The threshold of the pressure switches is 1450 psi
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