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wheel.
Each wheel has these components:
* Tire inflation valve
* Over pressure relief valve
* Thermal fuse plug (4).
Tire Inflation Valve
A tire inflation valve is in the inner wheel half.
Over Pressure Relief Valve
An over pressure relief valve is in the inner wheel half. The
relief valve releases all of the pressure in the tire when the
pressure increases more than 375-450 psi. The over pressure
relief valve must be replaced if it releases pressure.
Thermal Fuse Plugs
Four thermal fuse plugs in the inner wheel half prevent tire
explosion caused by hot brakes. The plugs melt to release tire
pressure at approximately 380F (192C). The fuse plug must be
replaced if it melts.
Main Landing Gear Tires
Main landing gear tires are H44.5 x 16.5-21 with a 28 bias ply
rating.
Training Information Point
The tire will last longer if you maintain the proper tire pressure
at all times.
If you use dry air to inflate the tire, make sure the oxygen
content does not exceed 5%.
If the measured tire pressure is below the selected nominal
service pressure by no more than 5%, inflate the tire to the
necessary pressure.
If the tire pressure is between 5% - 10% below the selected
nominal service tire pressure, inflate the tire and check it again
after 24 hours. If the tire pressure is more than 5% below the
selected nominal service pressure again, replace the tire.
If the measured tire pressure is between 10% - 20% below the
selected nominal service tire pressure, remove and replace the
wheel and tire assembly.
TIRES AND WHEELS - MAIN LANDING GEAR WHEEL AND TIRE
EFFECTIVITY
GUN ALL 32-45-00
Page 5
D633A101-GUN Feb 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-45-00-002
If the measured tire pressure is more than 20% below the
selected nominal service tire pressure, replace the tire and
wheel assembly. If the wheel and tire assembly has turned with
airplane weight on it after the pressure had decreased, replace
the wheel and tire assembly installed on the opposite side of
that axle.
When you assemble a main landing gear wheel, make sure the
inflation valve, which is on the inner wheel half, is aligned with
the correct ventilation hole in the outer wheel half. The correct
ventilation hole in the outer wheel half has the word VALVE on
the wheel next to the hole. This makes sure that the valve aligns
correctly with the valve access hole in the outboard hubcap.
WARNING: IT IS RECOMMENDED THAT YOU REMOVE ONLY
ONE WHEEL AND TIRE ASSEMBLY FROM THE
MAIN LANDING GEAR AT A TIME. IF YOU
REMOVE THE TWO WHEEL AND TIRE
ASSEMBLIES AT THE SAME TIME, STRUCTURAL
DAMAGE AND INJURY TO PERSONS CAN OCCUR
IF THE AIRPLANE FALLS.
CAUTION: MAKE SURE THAT THE WHEEL THAT YOU
INSTALL IS FROM THE SAME MANUFACTURER
AS THE BRAKE. DAMAGE CAN OCCUR IF YOU
INSTALL A WHEEL FROM A DIFFERENT
MANUFACTURER THAN THE BRAKE.
CAUTION: MAKE SURE THE BRAKE ROTORS ARE ALIGNED.
DAMAGE TO THE ROTORS CAN OCCUR IF THE
DRIVE KEYS ON THE WHEEL HIT ROTORS
DURING INSTALLATION.
TIRES AND WHEELS - MAIN LANDING GEAR WHEEL AND TIRE
EFFECTIVITY
GUN ALL 32-45-00
Page 6
D633A101-GUN Feb 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-45-00-002
TIRES AND WHEELS - MAIN LANDING GEAR WHEEL AND TIRE
TIRES AND WHEELS - MAIN LANDING GEAR WHEEL AND TIRE
EFFECTIVITY
GUN ALL 32-45-00
Page 7
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-45-00-002
Nose Landing Gear Wheels
The nose landing gear wheels are made of inner and outer
wheel halves. Tie bolts hold the two halves together.
Each wheel has these components:
* Tire inflation valve
* Over pressure relief valve.
Tire Inflation Valve
A tire inflation valve is in the outer wheel half.
Over Pressure Relief Valve
An over pressure relief valve is in the outer wheel half. The
relief valve releases all of the pressure in the tire when the
pressure is more than 375-450 psi. The over pressure relief
valve must be replaced if it releases pressure.
Nose Landing Gear Tires
GUN 201-999
Nose landing gear tires are 27 x 7.75-15 with a 12 bias ply rating.
GUN 001-099, 101-118
Nose landing gear tires are 27 x 7.75-R15 with a 12 radial ply
rating.
GUN ALL
WARNING: IT IS RECOMMENDED THAT YOU REMOVE ONLY
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