F. Prepare for the Procedure
 S 483-031
 WARNING: MAKE SURE THE DOWNLOCK PINS ARE INSTALLED ON ALL THE LANDING
_______ GEAR. WITHOUT THE DOWNLOCK PINS, THE LANDING GEAR COULD RETRACT AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  If the downlock pins are not installed in the nose and main landing gear, install the landing gear downlock pins (AMM 32-00-01/201).
 G. Procedure ú ú S 283-047 ú         ú
WARNING:_______DO NOT GO NEAR WHEEL, BRAKE, OR TIRE EQUIPMENT WHICH ARE ú SUSPECTED OF BEING OVERHEATED. DO THE PROCEDURE FOR HIGH ú ENERGY STOP/HEAT DAMAGE. INJURY TO PERSONS CAN OCCUR. ú ú (1) If the wheel, brake, or tire equipment is suspected of being ú overheated, do this task: High Energy Stop (AMM 05-51-07/201).
 S 613-026
 (2)  Make sure that all antiskid and autobrake system equipment is serviceable.
 NOTE: If there are problems with the antiskid or
____ autobrake systems, your average tire pressures can be higher than normal; this could cause you to over-inflate a suspected low pressure tire.
 S 613-019
 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.
 (3)  If all of the main landing gear tires can be assumed to be at approximately the same temperature, measure all of the main landing gear tire pressures and make a record of the values.
 (a)  Do a check of the main landing gear tire pressures with an accurate pressure gage.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 613-020
 CAUTION: DO NOT DEFLATE A HOT TIRE TO LOWER THE PRESSURE TO THE AVERAGE
_______ PRESSURE VALUE. PRESSURE SHOULD NEVER BE BLED FROM A HOT TIRE TO ACHIEVE A SPECIFIED VALUE. DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  Use the tire pressure tables for the main landing gear (use the tire pressures that are listed in the task for performing a tire pressure check):
 NOTE: The inflation pressures that are shown are for cold, loaded
____ tires (for example, with the airplane resting on the tires). ú For unloaded tires, reduce the pressure by 4%.
 (a)  For the applicable airplane maximum taxi weight and tire, find the minimum service pressure.
 S 613-022
 (5)  Make sure all of the main landing gear tire pressures are above the minimum "cold" specified pressures for the airplane's maximum taxi weight.
 S 613-023
 CAUTION: DO NOT DEFLATE A HOT TIRE TO LOWER THE PRESSURE TO THE AVERAGE
_______ PRESSURE VALUE. PRESSURE SHOULD NEVER BE BLED FROM A HOT TIRE TO ACHIEVE A SPECIFIED VALUE. DAMAGE TO EQUIPMENT CAN OCCUR.
 (6)  
If the pressure of one tire is low, calculate the average of the other three tires.

 S 613-024

 (7)  
If the pressure of the low tire is 5% - 10% less than the average pressure of the other three tires, do these steps:

 WARNING:_______USE A REGULATED PRESSURE SOURCE TO SERVICE THE TIRES. AN UNREGULATED PRESSURE SOURCE CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (a)  
Connect the inflator, F70199-1 to the inflation valve and inflate the tire with nitrogen, BB-N-411, Type I, or MIL-PRF-27401, Type I to the average value of the other three tires.

 (b)  
Remove the inflator, F70199-1 from the inflation valve.

 S 613-025
 (8)  If the pressure of the low tire is more than 10% below the average of the other three tires, do these steps:
 (a)  
Replace the wheel and tire assembly (AMM 32-45-11/401).

 (b)  
Send the wheel and tire assembly for an inspection to find the cause for the incorrect tire pressure.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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