6. Caution in Taxiing

The aircraft tire generates heat in the body much more than car tires. This heat generation is considerably influenced by taxi distance and taxi speed.
If a taxi is done at extraordinary higher speed, or for unexpectedly longer distance, tire temperature becomes extremely high.
Such increases in temperature accelerate deterioration of nylon cords, shorten the serviceability of the carcass, increase wearing of the tread, and lower the adhesion between ply cords.

As shown by Figure 3, tire temperatures continue to rise as taxiing distances increase. Although these values differ depending upon the type of aircraft, the general trend is the same. Increases in taxiing distances cause increased deterioration in aircraft tires. Note that taxiing speeds are also a factor affecting increases in tire temperatures.

Figure 4 illustrates the trend in the influence that a combination of underinflation and increased deflection will have on internal heat build-up. Operating under such conditions may cause the tire to exceed tire temperature limits. As shown by the graph, nylon cord strength decreases as temperature rises.

7. Inspection After Landing

Aircraft tires should always be inspected for damage after each landing. The inspector must check carefully for evidence of cuts, bulges and blisters, severe cracking, slippage on the wheel, evidence of severe overheating and other types of tire failure. Removal criteria is contained in "Examination and Recommended Action" p55.

8. Normal Wear Removal Criteria

Extreme wearing of the tire may cause wet-skidding or hydroplaning, or may damage the tire. Therefore the tire should be removed at the following condition whichever comes first across the tread;

If it is necessary to continue the tire in service beyond the limit i), the tire should be removed either at the next maintenance base or the limit ii) happens, whichever occurs first.

9. Removal due to Abnormal Use

If the tire is used under "abnormal operating condition", the tire must be removed from service immediately. Typical abnormal operating conditions are as listed below;

If the tire undergoes those conditions, the tire is not serviceable even though there is no specific sign of damage in appearance.
It is strongly recommended for operators to inform Bridgestone of any tire removed for abnormal use, in order for us to take appropriate actions required for subject occurrence.

Category Link:
Tire Care and Maintenance

Instructions specific to radial tires