(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 tire pressure is between 10%-20% below the necessary tire pressure, do these steps: 1) Replace the wheel and tire assembly.

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

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

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. a) 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. b) Send the tire for inspection for damage.
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5C9  Landing Gear Tire Inflation 
Feb 20/84  Figure 201  12-15-51 
Page 203 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

B.  Inflate tire (initial inflation).
WARNING:  TIRE MUST INITIALLY BE INFLATED WITH NITROGEN. IF TIRE WERE INFLATED WITH AIR, VOLATILE GASES GENERATED BY AN OVERHEATED TIRE COULD COMBINE EXPLOSIVELY WITH OXYGEN IN THE AIR INSIDE THE TIRE. A TIRE EXPLOSION CAN RESULT IN DAMAGE TO AIRPLANE AND/OR INJURY TO PERSONNEL.
(1)  
Install tire inflation tool per instructions on tool.

WARNING:  USE A REGULATED PRESSURE SOURCE TO SERVICE THE TIRES. AN UNREGULATED PRESSURE SOURCE CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT

(2)  
Inflate tire with nitrogen to pressure shown in Fig. 201.

(3)  
Remove tire inflation tool.

C.  Refill tire.
NOTE:  If refilling with air would result in an oxygen content in excess of 5 percent by volume as determined as follows, deflate tire to one atmosphere and inflate per initial inflation procedure.
1)  Install tire inflation tool per instructions on tool.
WARNING:  USE A REGULATED PRESSURE SOURCE TO SERVICE THE TIRES. AN UNREGULATED PRESSURE SOURCE CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT
(2)  Refill (top-off) with nitrogen. Air may be used when nitrogen is not available provided oxygen content in tire does not exceed 5 percent by volume. To assure that oxygen content does not exceed 5 percent, use one of the following procedures:
500 
12-15-51 Page 204  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/01 

(a)  
Make a record of each air refill. Sum of all air refill pressures added to tire must not be more than 6 psi.

EXAMPLE:  One 6 psi refill with air can be done before tire must be deflated and reinflated with nitrogen.

(b)  
Make a record of each air refill. Sum of all air refill pressures added to tire must not be more than maximum given in Fig. 202.

EXAMPLE:  Assume tire is initially inflated to 165 psi with nitrogen. Per Fig. 202, sum of all air refill pressures that can be added to tire is 30 psi. One 6 psi, one 14 psi, and two 5 psi refills with air can be done before tire must be deflated and reinflated with nitrogen.
(3)  Remove tire inflation tool.
D.  Hot tire pressure check.
(1)  
If the pressure of one tire is 5%-10% below the average pressure of the other tires, do these steps:

(a)  Inflate the tire to the average pressure of the other tires.

(2)  
If the tire pressure of one tire is more than 10% below the average pressure of the other tires, do these steps:

(a)  Replace the wheel and tire assembly.
1)  Send the wheel and tire assembly for an inspection to find the cause for the low tire.
(3)  If the tire pressure of one tire is more than 20% below the average pressure of the other tires, do these steps:
　
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