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 12-15-02
 ALL  ú ú 01 Page 312 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
K16703
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757 MAINTENANCE MANUAL
 LANDING GEAR TIRES - SERVICING
______________________________
 1.  General
_______
 A.  This procedure contains one task. The task is to inflate a tire by one of these two procedures:
 (1)  
Fill the tires with nitrogen to the pressure that is necessary.

 (2)  
Add nitrogen and air (if it is necessary) to a tire that is not fully inflated.

 NOTE: We use the word "refill" or the word "top-off" as an
____ alternative to the word "add" as shown in these examples:
 -Add nitrogen and air to a tire.
 -Refill the tire with nitrogen and air.
 -Top-off the tire with nitrogen and air.
 TASK 12-15-03-613-001
 2.  Servicing of the Main and Nose Gear Tires
_________________________________________
 A.  Equipment
 (1)  Tire Inflation Tool - F70199-1
 B.  Consumable Materials
 (1)  
Dry Nitrogen - Commercial grade (99.5 percent pure nitrogen), from a regulated source

 (2)  
Dry Air - If nitrogen is not available - a source of clean dry air

____________________________ with maximum moisture content that is equivalent to an atmospheric dew point of -20°F (-29°C), from a regulated pressure source
 C.  References
 (1)  
AMM 32-45-01/401, Main Gear Tires

 (2)  
AMM 32-45-02/401, Nose Gear Tires

 D.  Access
 (1)  Location Zones
 731 Left Main Landing Gear
 741 Right Main Landing Gear
 711 Nose Landing Gear

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 12-15-03
 ú  ALL  ú
 ú ú  ú 01.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 301Sep 28/02 

A

757
MAINTENANCE MANUAL

 ú  E.  Preparation for Servicing of the Main and Nose Gear Tires
 ú
 ú  S 843-030
 ú 
        ú
 CAUTION: USE A CALIBRATED GAGE WITH AN APPROVED DIAL TO DO A CHECK OF_______
 ú  THE TIRE PRESSURE. IF THE GAGE IS NOT ACCURATE, YOU CAN
 ú  INFLATE THE TIRE TO THE INCORRECT PRESSURE. THIS CAN CAUSE
 ú  DAMAGE TO THE TIRE.
 ú
 ú  (1) Obey this CAUTION during all of this task.
 ú
 ú  S 843-042
 ú  (2) Some airplanes have a tire pressure gage installed in the wheels.
 ú  The tire pressure gage is part of an assembly that includes the gage
 ú  and the tire fill valve. You can use the gage for walk-around
 ú  inspections and other fast checks. You must use a calibrated gage
 ú  with an approved dial when you inflate a tire. You must also use
 ú  the calibrated gage when the tire pressure indication must be very
 ú  accurate.
 ú
 ú  S 843-039
 ú  (3) All tires must initially be inflated with nitrogen.
 ú
 ú  S 843-041
 ú  (4) You can add air to the tire when nitrogen is not available, but you
 ú  must obey this limit:
 ú  (a) The oxygen in the air that you add must not be more than 5
 ú  percent of the total tire volume.
 ú
 ú  S 843-038
 ú  (5) Two procedures to refill the tire are given in paragraph 2.F.(3)(d),
 ú  Service the Main and Nose Gear Tires (Fig. 301).
 ú  (a) The first procedure permits one value of 13 psi for the sum of
 ú  all the air refill pressures. This procedure is more easy to
　
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