S 613-014

 (3)  
If the tire does not have a load on it (the weight of the airplane is not on the tires), decrease the pressure by 4 percent.

 S 093-015

 (4)  
Remove the tire inflation tool.

 I. Add Nitrogen or Air to a Tire (Fig. 303)
 NOTE: If the tire will contain more than 5 percent oxygen by volume, as
____ specified below, you must deflate the tire to one atmosphere and do the Initially Inflate the Tire procedure.
 S 493-016
 (1)  Use the instructions on the tire inflation tool to install the tool.
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747-400
MAINTENANCE MANUAL

 S 613-017
 (2)  Add air to the tire as specified in Procedure 1 or Procedure 2 that follow:
 NOTE: You can use air when nitrogen is not available but you
____
 must obey these limits:

 -The air that you add cannot increase the volume of oxygen in the tire to more than 5 percent.
 -To make sure that the oxygen does not become more than 5 percent, use one of the procedures that follow:
 (a)  
Procedure 1: Make a record of the quantity of air that you add each time to the tire. The sum of all the air refill pressures must not be more than 19 psi.

 EXAMPLE:  You can add 8 psi of air, then add 11 psi of air to the tire to total 19 psi of air refill pressure. When it is necessary to add gas to the tire again, you must deflate the tire, then inflate the tire with nitrogen.

 (b)  
Procedure 2: Make a record of the quantity of air that you add each time to the tire. The sum of the air that you add must not be more than the maximum shown in the Air Refill Pressure chart.

 EXAMPLE:  This example is for a tire that is initially inflated
_______ to 165 psi with nitrogen. As shown in the Air Refill Pressure chart, the sum of all air refill pressures that you can add to the tire is 30 psi. For example, you can add one 6 psi, one 14 psi, and two 5 psi of air to total 30 psi of air refill pressure. When it is necessary to add gas to the tire again, you must deflate the tire and inflate it with nitrogen.
 S 093-019
 (3)  Remove the tire inflation tool.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

747-400 (UP TO 875,000 LB MTGW)
220

213
210
203
200
200
190
185
180
175
170
TIRE PRESSURE (PSI, COLD LOADED)

160
150
140
130
120
110
100
NOSE GEAR
____1. FIND A TIRE PRESSURE IN THE APPLICABLE RANGE FOR THE TIRE AND AIRPLANE WEIGHT.
NOTE:
2.
 THE TOLERANCE FOR THE INFLATION PRESSURE IS +5/ -0 PSI.

3.
 THE INFLATION PRESSURES THAT ARE SHOWN ARE FOR COLD, LOADED (THE WEIGHT OF THE AIRPLANE IS ON THE TIRES) TIRES. REDUCE THE PRESSURE 4% FOR UNLOADED TIRES.

4.  
THE OPERATIONAL WEIGHT OF THE AIRCRAFT MUST BE LESS THAN OR EQUAL TO THE MAXIMUM DESIGN TAXI WEIGHT (REFER TO THE AIRPLANE WEIGHT - CENTER OF GRAVITY LIMITS IN THE WEIGHTS AND BALANCE MANUAL FOR THE MAXIMUM DESIGN TAXI WEIGHT).

Tire Pressure Limits Figure 301
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 03 Page 308 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

747-400 (UP TO 875,000 LB MTGW)
220
213
210
200
200

TIRE PRESSURE (PSI, COLD LOADED)

190
180
170
160
150
140
130
120
110
100
MAIN GEAR
　
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