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mode.
YELLOW ELECTRIC PUMP
The yellow ELEC PUMP pushbutton controls the yellow
electric pump.
BLUE PUMP OVERRIDE
For maintenance purposes, the blue hydraulic circuit
can be pressurized by pressing the BLUE PUMP OVRD
pushbutton on the maintenance overhead panel.
On ground, the electric pump operates, provided the
BLUE PUMP OVRD pushbutton has been pressed in and the
ELEC PUMP pushbutton is set to AUTO.
LEAK MEASUREMENT VALVES
A leak measurement valve is positioned in each circuit
upstream of the primary flight controls.
Used for the leakage measurement of each circuit, they
are closed, on ground only, by selecting OFF the leak
measurement valve pushbutton switches on the
maintenance overhead panel.
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SYSTEM CONTROLS
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THIS PAGE INTENTIONALLY LEFT BLANK
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29 - HYDRAULIC SYSTEM
29-00-00 HYDRAULIC SYSTEM USERS
CONTENTS:
Green, Blue, Yellow users
Priority Valves
TMUHYD302 LEVEL 1
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HYDRAULIC SYSTEM USERS
GREEN, BLUE, YELLOW USERS
The three independent hydraulic systems respectively
supply the users indicated on the diagram.
Between these systems, the users are shared in order
to ensure the aircraft control, even if only one
hydraulic system is inoperative.
On the blue hydraulic system, the Constant Speed
Motor/Generator (CSM/G) is used to provide aircraft
electrical power in case of emergency.
PRIORITY VALVES
In the event of low hydraulic pressure, the priority
valves maintain the operation of essential systems by
cutting off hydraulic power to heavy load users.
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HYDRAULIC SYSTEM USERS
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SELF EXAMINATION
What happens if the hydraulic pressure drops ?
A- The priority valves give priority to the
heavy load users.
B- The priority valves give priority to the
essential systems.
C- The priority valves modulate the pressure
to the users.
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29 - HYDRAULIC SYSTEM
29-00-00 CIRCUIT IDENTIFICATION AND
ROUTING
CONTENTS:
Pipe Routing
Pipe Identification
Component Identification
Connections
Self Examination
TMUHYAL02 LEVEL 1
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CIRCUIT IDENTIFICATION AND ROUTING
PIPE ROUTING
The three systems are hydraulically independent.
There are no hydraulic pipes in the passenger cabin
or flight compartment.
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CIRCUIT IDENTIFICATION AND ROUTING
TMUHYAL02-P01 LEVEL 1
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CIRCUIT IDENTIFICATION AND ROUTING
PIPE IDENTIFICATION
Each pipe is identified by a self-adhesive label which
　
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