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speed signal to the auto speed brake system for each wheel,
both inboard wheels, or both outboard wheels. To do the wheel
speed signal test, move the rotary switch to the 1, 2, 3, 4, INBD,
or OUTBD position. Then push and hold the ENABLE/VERIFY
switch, move the PRESS/TEST/BIT switch to the PRESS/TEST
position, and release both switches. This sends the more than
60 knot wheel speed signal to the auto speed brake system.
See the speedbrake control system section for more
information about the auto speedbrake system.
(SECTION 27-62)
Reset
When you push the RESET switch, the faults stored in the BIT
memory from the continuous monitoring are erased.
ANTISKID/AUTOBRAKE SYSTEM - TRAINING INFORMATION POINT - AACU BITE
EFFECTIVITY
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ANTISKID/AUTOBRAKE SYSTEM - TRAINING INFORMATION POINT - AACU BITE
ANTISKID/AUTOBRAKE SYSTEM - TRAINING INFORMATION POINT - AACU BITE
EFFECTIVITY
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32-44-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The parking brake system uses the normal hydraulic brake
system to keep the main landing gear brakes applied when you
park the airplane.
Parking Brake System Indication
A red parking brake light adjacent to the parking brake lever
shows the condition of the parking brake system.
Training Information Point
CAUTION: PARKING BRAKES SHOULD NOT BE SET
FOLLOWING A HIGH ENERGY STOP. HIGH
ENERGY STOPS ARE DEFINED AS A REFUSED
TAKE OFF OR ANY STOP OTHER THAN NORMAL.
UNDER STATIC PRESSURE, HOT BRAKE
SURFACES TEND TO FUSE TOGETHER.
THEREFORE, AFTER A HIGH ENERGY STOP, OR
FOLLOWING TOUCH AND GO STOPS, A COOLING
PERIOD OF 40 TO 60 MINUTES SHOULD BE
ALLOWED BEFORE THE PARKING BRAKE IS SET.
PARKING BRAKE SYSTEM - INTRODUCTION
EFFECTIVITY
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PARKING BRAKE SYSTEM - INTRODUCTION
PARKING BRAKE SYSTEM - INTRODUCTION
EFFECTIVITY
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Components
These are the parking brake system components:
* Parking brake lever
* Parking brake linkage
* Parking brake switch
* Parking brake light
* Parking brake close sense relay
* Parking brake shutoff valve.
General Description
When you push the brake pedals and pull the parking brake
lever, the linkage latches the brake pedals in the brakes-applied
position. This operates the brake metering valves, which supply
pressure to the brakes.
The parking brake switch sends a signal to close the parking
brake shutoff valve. The switch sends a parking brake set signal
to the proximity switch electronics unit.
The parking brake shutoff valve does not let brake pressure
leak from the return of the normal antiskid valves.
The parking brake shutoff valve sends a signal to operate the
parking brake light. The valve also sends a signal through the
parking brake close sense relay to the antiskid/autobrake
control unit.
A fully charged (3000 psi) brake accumulator keeps the brakes
pressurized at least eight hours. Use chocks around both
outboard main landing gear wheels when you park the airplane
more than eight hours.
To release the parking brake, push the brake pedals until the
parking brake lever moves down, then release the brake
pedals. This sends brake metered pressure to the hydraulic
system return through the brake metering valves.
PARKING BRAKE SYSTEM - GENERAL DESCRIPTION
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PARKING BRAKE SYSTEM - GENERAL DESCRIPTION
PARKING BRAKE SYSTEM - GENERAL DESCRIPTION
　
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