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pressurized enabling ground operations when the
engines are stopped.
Normal system operating pressure is 3000 psi
(206 bars).
HAND PUMP
The hand pump is used to operate the cargo doors when
no electrical power is available.
It is located on the yellow ground service panel.
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SYSTEM PRESENTATION
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RAM AIR TURBINE
A Ram Air Turbine extends automatically in the event
of both engine and APU generator failures and allows
the blue hydraulic system to be pressurized.
RAT delivered pressure is 2500 psi (172 bars).
Manual operation from the cockpit is always possible.
The Ram Air turbine is located in the blue hydraulic
compartment.
NOTE: RAT stowage is possible on ground only.
ACCUMULATORS
An accumulator, in each circuit helps to maintain a
constant pressure during normal operation, by covering
transient demands.
POWER TRANSFER UNIT
A bidirectional Power Transfer Unit enables the green
system to be powered by the yellow system or vice
versa, without fluid transfer.
The PTU is automatically activated when the
differential pressure between the green and yellow
system is higher than 500 psi (34 bars). When the
engines are shut down, the PTU allows the green system
to be pressurized using the yellow electric pump. The
PTU is inhibited during the first engine start and is
automatically tested at second engine start.
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THIS PAGE INTENTIONALLY LEFT BLANK
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SELF EXAMINATION
Which hydraulic systems are pressurized by an
engine driven pump ?
A - Blue and green.
B - Yellow and blue.
C - Green and yellow.
In normal operation, what is the blue hydraulic
system pressurized by ?
A - The Power Transfer Unit.
B - An engine driven pump.
C - An electric pump.
Is it possible to stow the Ram Air Turbine
in flight ?
A - No.
B - Yes.
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29 - HYDRAULIC SYSTEM
29-10-00 SYSTEM CONTROLS
CONTENTS:
Engine 1 Pump
Ram Air Turbine
Blue Electric Pump
Power Transfer Unit
Engine 2 Pump
Yellow Electric Pump
Blue Pump Override
Leak Measurement Valves
TMUHYD405 LEVEL 1
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SYSTEM CONTROLS
ENGINE 1 PUMP
ENG 1 PUMP pushbutton controls the engine 1 hydraulic
pump.
In normal conditions the engine driven pump 1
pressurizes the green system. When the pushbutton is
set to OFF, the pump operates in the depressurized
mode.
RAM AIR TURBINE
The RAT MAN ON guarded pushbutton permits Ram Air
Turbine deployment at any time.
RAT deployment is automatic in case of failure of main
generators (engines and APU) in flight.
BLUE ELECTRIC PUMP
The blue ELEC PUMP pushbutton controls the blue
electric pump.
With the BLUE ELEC PUMP pushbutton set to AUTO, the
electric pump operates from the moment the first engine
is started until the last engine is shut-down.
When the pushbutton is set to OFF, the pump is
de-energized.
POWER TRANSFER UNIT
The PTU pushbutton controls the arming of the
bidirectional Power Transfer Unit automatic function.
ENGINE 2 PUMP
ENG 2 PUMP pushbutton controls the engine 2 hydraulic
pump.
In normal conditions the engine driven pump 2
pressurizes the yellow system. When the pushbutton is
set to OFF, the pump operates in the depressurized
　
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