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system are deactivated and all the return lines are
shut off.
The parking brake electrical control valve comprises
one electrical linear transmitter which operates the
hydromechanical valve and a pressure limiter for the
dual shuttle valve supply.
The secondary slide valve of the automatic selector
isolates the return lines of the alternate brake
servovalves to prevent fluid leakage to the yellow
reservoir.
The parking brake operated valve shuts off the supply
to the alternate system to prevent leakage through the
dual valve.
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BRAKE HYDRAULIC SYSTEM OPERATION - PARKING BRAKE
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SELF EXAMINATION
What is the purpose of the hydraulic fuses?
A - To stop the flow in case of leakage.
B - To shut off the return lines.
C - To separate the Normal from the
Alternate Servovalves.
Are the return lines shut off when the parking
brake is applied?
A - No, they are always open.
B - Yes, by the Automatic Selector.
C - Yes, when braking is supplied by the
accumulator only.
Which component gives priority to the green
hydraulic system?
A - Brake Selector Valve.
B - Throttle Valve.
C - Automatic Selector.
TMULDGT05 LEVEL 3
EFFECTIVITY 32-40-00 Page 10
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_A319/A320/A321 TECHNICAL TRAINING MANUAL
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UF94200
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32 - LANDING GEAR
32-47-00 WHEELS AND BRAKES - BRAKE
TEMPERATURE SYSTEM PRESENTATION
CONTENTS:
Purpose
Temperature Sensor
Brake Temperature Monitoring Unit (BTMU)
Braking and Steering Control Unit (BSCU)
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WHEELS AND BRAKES - BRAKE TEMPERATURE SYSTEM PRESENTATION
PURPOSE
The system measures the brake temperature and indicates
the values on the lower display unit of the ECAM.
A warning is generated when the brake temperature
threshold is exceeded.
TEMPERATURE SENSOR
Brake temperature is measured by one chromel-alumel
thermocouple per brake.
BRAKE TEMPERATURE MONITORING UNIT
The Brake Temperature Monitoring Unit (BTMU) is
equipped with two printed circuits to process the data
from the thermocouples.
After processing, the BTMU delivers a voltage which
varies between 1V and 9V corresponding to a temperature
range of 0 to 1000°C.
BRAKING AND STEERING CONTROL UNIT
The Braking and Steering Control Unit (BSCU) changes
analog signals from the monitoring unit into digital
signals for temperature indication on the lower ECAM
display unit.
The amber HOT light on the optional BRK FAN pushbutton
comes on when the temperature threshold of any brake
is reached.
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BRAKE TEMPERATURE SYSTEM PRESENTATION
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THIS PAGE INTENTIONALLY LEFT BLANK
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32 - LANDING GEAR
32-48-00 BRAKE COOLING SYSTEM PRESENTATION
CONTENTS
Purpose
Control and Logic
Brake Fans
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BRAKE COOLING SYSTEM PRESENTATION
PURPOSE
The brake fan system allows the brakes to be cooled
in a short time period.
CONTROL AND LOGIC
The BRK FAN pushbutton is used to operate the fan when
　
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