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TMUHYDJ02-P07 LEVEL 3
BLUE SYSTEM COMPONENTS
EFFECTIVITY 29-12-00 Page 15
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 133
ALL
BLUE SYSTEM COMPONENTS
PRESSURE SWITCH
IDENTIFICATION
FIN: 2074GJ
LOCATION
ZONE: 195
DESCRIPTION
The pressure switch is installed downstream of the
electric pump to monitor the output pressure. It sends
a signal to the ECAM and a local warning to display
the blue pump low pressure warning.
PULSATION DAMPENER
IDENTIFICATION
FIN: 2092GM
LOCATION
ZONE: 195
DESCRIPTION
The pulsation dampener, which is a metal sphere, is
installed in the pump outlet line to remove pulses
from the HP flow.
TMUHYDJ02-T08 LEVEL 3
EFFECTIVITY 29-12-00 Page 16
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 134
ALL
TMUHYDJ02-P08 LEVEL 3
BLUE SYSTEM COMPONENTS
EFFECTIVITY 29-12-00 Page 17
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 135
ALL
BLUE SYSTEM COMPONENTS
RAM AIR TURBINE (RAT)
IDENTIFICATION
FIN: 2GE
LOCATION
ZONE: 195
DESCRIPTION
The RAT is installed in the LH belly fairing. It is
extended into the airflow by an actuator. RAT
retraction is only possible when the aircraft is on
ground.
The RAT is a constant speed unit with two 39.5 inch
(1m) variable pitch blades. The RAT is extended and
locked in position by means of a RAT actuator.
A RAT de-icing device prevents icing conditions at the
turbine hub by producing heat, which keeps the nose
temperature to 3 deg.C minimum. Heat is produced by
the eddy current device composed of two basic
components: an aluminium plate and an even number of
magnets.
RAT ACTUATOR
IDENTIFICATION
FIN: 1GE
LOCATION
ZONE: 195
DESCRIPTION
The RAT actuator is installed between the aircraft
structure and the RAT leg assembly. It is used for RAT
extension and retraction. It is extended by spring
force and retracted by hydraulic power. The jack is
mechanically locked in both the extended and retracted
positions. RAT extension is controlled by two solenoids
located at the top of the actuator. A ground retraction
module controls the retraction of the actuator.
TMUHYDJ02-T09 LEVEL 3
EFFECTIVITY 29-12-00 Page 18
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 136
ALL
TMUHYDJ02-P09 LEVEL 3
BLUE SYSTEM COMPONENTS
EFFECTIVITY 29-12-00 Page 19
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 137
ALL
BLUE SYSTEM COMPONENTS
RESERVOIR
IDENTIFICATION
FIN: 2000GQ
LOCATION
ZONE: 197
DESCRIPTION
The inside of the reservoir includes baffles which
give a supply of fluid under negative "g" conditions.
The baffles also form an anti-emulsion device which
limits the emulsion when there is a large return flow.
TMUHYDJ02-T10 LEVEL 3
EFFECTIVITY 29-12-00 Page 20
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 138
ALL
BLUE SYSTEM COMPONENTS - RESERVOIR
TMUHYDJ02-P10 LEVEL 3
EFFECTIVITY 29-12-00 Page 21
Nov 30/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 139
ALL
BLUE SYSTEM COMPONENTS
AIR PRESSURE GAGE
IDENTIFICATION
FIN: 2383GM
LOCATION
ZONE: 197
DESCRIPTION
The reservoir pressure gage displays the air pressure
in a range of 0-75 psi (0-5.15 bar).
AIR PRESSURE SWITCH
IDENTIFICATION
FIN: 2384GH
LOCATION
ZONE: 197
DESCRIPTION
The air pressure switch closes when the pressure
decreases to 22 psi (1.5 bar).The contact opens when
the pressure increases to 25 psi (1.7 bar).
AIR RELIEF VALVE
IDENTIFICATION
FIN: 2005GM
LOCATION
ZONE: 197
DESCRIPTION
The air relief valve relieves pressure to the
atmosphere in the event of a system overpressurization
　
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