(2)  
Hot Tire Pressure Check.

 TASK 12-15-51-603-001
 2. Service of the Main and the Nose Gear Tires
___________________________________________
 A. Special Tools and Equipment
 (1)  Tool - Tire Inflation, F70199-1
 B. Standard Tools and Equipment
 (1) Gage - Tire pressure, calibrated with a standard size dial
 C. Consumable Materials
 (1)  
Dry Nitrogen - Commercial grade (99.5 percent pure nitrogen), from a regulated pressure source

 (2)  
Air Source - clean dry with a maximum moisture content that corresponds to an atmospheric dewpoint of -20 degrees F (-29 degrees C), from a regulated pressure source

 D. References
 (1)  
AMM 32-45-11/401, Main Landing Gear Wheel and Tire

 (2)  
AMM 32-45-21/401, Nose Landing Gear Wheel and Tire

 E. Access
 (1)  Location Zone
 204 Nose Landing Gear
 310 Left Main Landing Gear
 410 Right Main Landing Gear

 F. Do a Check on the Tire Pressure
 S 613-003
 (1)  Make sure the tires are cool before you measure the tire pressure.
 NOTE: The tires are cool when they are at ambient temperature or
____ after two hours has expired since the airplane landed (if the tires are not in direct sunlight.)
 S 223-002
 CAUTION: USE A CALIBRATED GAGE WITH AN APPROVED SIZE DIAL TO DO A CHECK
_______ ON THE TIRE PRESSURE. INCORRECT INFLATION FROM INCORRECT PRESSURE VALUES CAN CAUSE DAMAGE TO THE TIRE.
 (2)  Do a check on the tire pressure with an accurate gauge.
 (a)  Let the tires cool for a minimum of two hours after a flight before doing the tire pressure check.
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 12-15-51
 ALL  ú ú 02 Page 301 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 613-043
 (3)  
Compare the measured pressure to the pressure found in the main and nose gear tire pressure limit charts (Fig. 301).

 S 613-044

 (4)  
Do these steps for tires which have tire pressures below the necessary pressure:

 (a)  
If the measured tire pressure is below the necessary pressure by no more than 5%, inflate the tire to the necessary pressure.

 (b)  
If the measured tire pressure is between 5% - 10% below the necessary tire pressure, do these steps: 1) Inflate the tire to the necessary pressure. 2) Do a check of the tire pressure again after 24 hours. 3) If the tire pressure is more than 5% below the necessary

 pressure again, replace the tire. a) Send the wheel and tire assembly for an inspection to find the cause for the low pressure.

 (c)  
If the measured pressure is between 10% - 20% below the necessary tire pressure, do these steps: 1) Replace the tire and wheel assembly. 2) Send the wheel and tire assembly for an inspection to find

 the cause for the low tire pressure.

 (d)  
If the measured tire pressure is more than 20% below the necessary tire pressure, do these steps: 1) Replace the tire and wheel assembly. 2) Send the wheel and tire assembly for an inspection to find

 the cause for the low tire pressure.
 3)  If the wheel and tire assembly has turned with the airplane weight on it after the pressure had decreased, replace the wheel and tire assembly installed on the opposite side of that axle.
 4)  Mark on the tire that it was on the same axle with a wheel and tire assembly that was replaced because of low tire pressure.
 5)  Send the tire for inspection for damage.
 G.  Inflate the Tire (Initial Fill)
 S 493-005
 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 TIRE). A TIRE EXPLOSION CAN CAUSE DAMAGE TO THE AIRPLANE AND/OR INJURY TO PERSONS.
 (1)  Install the tire inflation tool (refer to the instructions on the tool).
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