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set and airplane on ground signal to other airplane systems.
See the takeoff warning system section for more information
about the aural warning system. (SECTION 31-53)
See the air/ground system section for more information about
the PSEU. (SECTION 32-09)
Fault Monitoring
When the valve moves to the closed position, a limit switch
inside the valve sends 28v dc from the parking brake switch to
energize the parking brake close sense relay. A valve position
signal goes through the parking brake close sense relay to the
antiskid/autobrake control unit (AACU). The AACU monitors the
parking brake shutoff valve for failure.
See the antiskid/autobrake system section for more information
about the AACU. (SECTION 32-42)
PARKING BRAKE SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL
EFFECTIVITY
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PARKING BRAKE SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL
PARKING BRAKE SYSTEM - FUNCTIONAL DESCRIPTION - ELECTRICAL
EFFECTIVITY
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Main Landing Gear
Each main landing gear has two tire and wheel assemblies.
Nose Landing Gear
The nose landing gear has two tire and wheel assemblies.
Nose Wheel Spin Brake
Nose wheel spin brakes stop nose wheel rotation during
retraction when the nose wheels enter the wheel well.
Training Information Point
Obey these warnings and cautions when you do maintenance
on the tires and wheels.
WARNING: YOU MUST DEFLATE THE TIRE BEFORE YOU
REMOVE THE WHEEL AND TIRE ASSY. A
DEFECTIVE WHEEL AND TIRE CAN EXPLODE IF
YOU DO NOT DEFLATE THE TIRE BEFORE YOU
REMOVE THE ASSEMBLY. INJURY TO PERSONS
OR DAMAGE TO EQUIPMENT CAN OCCUR.
WARNING: MAKE SURE ALL PERSONS ARE CLEAR OF THE
INFLATION VALVE PATH. IF THE VALVE BLOWS
OFF WHILE YOU REMOVE IT, INJURY TO
PERSONS CAN OCCUR.
WARNING: DO NOT INFLATE A TIRE TOO MUCH. IF YOU
INFLATE A TIRE TOO MUCH, A TIRE AND/OR
WHEEL FAILURE CAN OCCUR. THIS CAN CAUSE
INJURY TO PERSONS OR DAMAGE TO
EQUIPMENT.
WARNING: DEFLATE THE TIRE BEFORE YOU REMOVE THE
TIE BOLTS. AN EXPLOSIVE SEPARATION OF THE
WHEEL HALVES COULD CAUSE INJURY OR
DAMAGE.
WARNING: YOU MUST INITIALLY INFLATE THE TIRE WITH
NITROGEN. IF THE TIRE WAS INITIALLY INFLATED
WITH AIR, THE GASES (IN A TIRE THAT HAS
BECOME TOO HOT) COULD HAVE AN EXPLOSIVE
MIXTURE WITH THE OXYGEN (IN THE AIR THAT
WAS PUT IN THE TIRES). A TIRE EXPLOSION CAN
CAUSE DAMAGE TO THE AIRPLANE AND/OR
INJURY TO PERSONS.
CAUTION: MAKE SURE THE DIRECT READING GAGE IS
CORRECTLY CALIBRATED AND HAS AN
APPROVED DIAL. IF THE GAGE IS NOT
ACCURATE, YOU CAN INFLATE THE TIRES TO
AN INCORRECT PRESSURE. THIS CAN CAUSE
DAMAGE TO THE TIRES.
TIRES AND WHEELS - GENERAL DESCRIPTION
EFFECTIVITY
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CAUTION: DO NOT APPLY GREASE TO THE AREA BETWEEN
THE AXLE BEARINGS. HIGH TEMPERATURES IN
THIS AREA DURING A LANDING CAN CAUSE ALL
GREASE IN THIS AREA TO BURN. THIS CAN
CAUSE DAMAGE TO WHEELS, TIRES, AND
BRAKES.
TIRES AND WHEELS - GENERAL DESCRIPTION
EFFECTIVITY
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TIRES AND WHEELS - GENERAL DESCRIPTION
TIRES AND WHEELS - GENERAL DESCRIPTION
EFFECTIVITY
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THIS PAGE IS INTENTIONALLY LEFT BLANK
TIRES AND WHEELS - GENERAL DESCRIPTION
32-45-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Main Landing Gear Wheels
The main landing gear wheels are made of inner and outer
wheel halves. Tie bolts hold the two halves together. Brake
rotor drive keys and heat shields are in the inner half of each
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