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ALL
YELLOW HYDRAULIC SYSTEM D/O
Most of the system components are installed in the
yellow hydraulic compartment, located in the right
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
indications and warnings.
Normal fill level: 12 l (3.17 US gal).
Maximum gaugeable level: 18 l (4.76 US gal).
Low level warning: 3 ± 0.4 l (0.79 ± 0.1 US gal).
RESERVOIR PRESSURIZATION
The reservoir is normally pressurized with air to
prevent cavitation of the pumps.
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).
FIRE VALVE
The yellow system fire valve installed in the right
hand wing, inboard of the pylon, is controlled by ENG2
FIRE pushbutton.
When the valve closes it stops the supply of fluid to
the Engine Driven Pump.
ENGINE DRIVEN PUMP
The Engine Driven Pump is attached to the accessory
gearbox. A solenoid valve controlled by the ENG 2 PUMP
pushbutton selects the pressurized or depressurized
mode.
The Engine Driven Pump cooling and lubricating flow
passes through a case drain filter installed in the
return line.
Pump outlet pressure is 3000 psi (206 bar) at zero
flow.
The Engine Driven Pump includes a blocking valve which
isolates the pump from the hydraulic system when the
pump operates in the depressurized mode.
Case drain filter clogging indication: DP = 87 ± 8.7
psi (6 ± 0.6 bar).
GROUND COUPLINGS
On the ground it is possible to pressurize the yellow
hydraulic system from a ground power unit.
TMUHYDD04-T01 LEVEL 3
EFFECTIVITY 29-13-00 Page 2
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 54
ALL
YELLOW HYDRAULIC SYSTEM D/O
TMUHYDD04-P01 LEVEL 3
EFFECTIVITY 29-13-00 Page 3
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 55
ALL
YELLOW HYDRAULIC SYSTEM D/O
PRESSURE SWITCH
A pressure switch monitors the Engine Driven Pump
outlet pressure for ECAM indications.
The threshold of the pressure switch is 1740 psi (120
bar).
NOTE: A check valve downstream of the pump stops the
fluid flow to the pump if the system is
pressurized by the Power Transfer Unit (PTU) or
by the yellow electric pump.
POWER TRANSFER UNIT
The Power Transfer Unit will run automatically when
the differential pressure between the green and yellow
systems is greater than 500 psi (34.5 bar).
The PTU is inhibited during the first engine start and
cargo door operation.
ELECTRIC PUMP
The yellow electric pump runs if the ELEC PUMP
pushbutton is set to ON, or if a cargo door selector
is operated.
The electric pump cooling and lubricating flow passes
through the return filter.
In case of cargo door operation, the PTU is inhibited,
the yellow leak measurement valve is closed and a
signal is sent to SFCC2 to prevent flaps movement.
A check valve downstream of the pump stops the fluid
flow to the pump if the system is pressurized from the
Engine Driven Pump or the PTU.
HAND PUMP
The hand pump is installed on the ground service panel
of the yellow system and is used for manual cargo door
operation only. On ground, when no electrical power
is available, the hand pump can be used to open or
close the cargo doors.
TMUHYDD04-T02 LEVEL 3
EFFECTIVITY 29-13-00 Page 4
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 56
ALL
YELLOW HYDRAULIC SYSTEM D/O
TMUHYDD04-P02 LEVEL 3
EFFECTIVITY 29-13-00 Page 5
Jul 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 57
ALL
YELLOW HYDRAULIC SYSTEM D/O
HIGH PRESSURE MANIFOLD
PRESSURE SWITCHES
The signals from both pressure switches are sent to
the ECAM system, to the Flight Control Computers and
to the Flight Augmentation Computer 2.
The threshold of the pressure switches is 1450 psi
(99.5 bar).
PRESSURE TRANSDUCER
The pressure transducer provides data for pressure
indication on the ECAM and sends information to ELAC
　
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