Aircraft Tires
Care and Maintenance Tire Care and Maintenance
15. Matching Tire Diameters
Axle mate tires ought to have close outside-diameters, in order to equalize vertical load bearing.
Recommended tolerance of the diameter difference for the inflated tire is listed in the Table 4.
Table 4
| Tire Outside Diameter Inch (mm) | Maximum Tolerance Inch (mm) | ||
|---|---|---|---|
| Up to 24" | (610) | 1/4" | (6.4) |
| 24~32 | (611~813) | 5/16" | (7.9) |
| 32~40 | (814~1016) | 3/8" | (9.5) |
| 40~48 | (1017~1219) | 7/16" | (11.1) |
| 48~55 | (1220~1397) | 1/2" | (12.7) |
| 55~65 | (1398~1651) | 9/16" | (14.3) |
| 66~over | (1652~over) | 5/8" | (15.9) |
16. Tire Flat-spot
- If an aircraft is grounded for a long period of time, the tire deformation becomes "permanent" and flat spot remains at the tread area even after the vertical load is removed.
- The flat spot tends to occur more easily at lower ambient temperature.
- For most of the case, the distortion disappears during taxi, however, if significant vibration remains detected, the tire should be removed from service.
- To prevent permanent flat-spot, it is recommended to place the aircraft on jacks, roll the tire periodically, or move the aircraft when the aircraft is parked for a long period of time.
- To prevent tire flat spot, tire / wheel assemblies which are stored for a long period of time, those should be also rotated periodically.
17. Protection from Contamination
Care should be taken that tires do not come into contact with oil, gasoline, jet fuel, hydraulic fluids or similar hydrocarbons. Such substances have deteriorating effects on rubber. When servicing aircraft, cover tires. Be especially careful not to stand or lay tires on floors that are covered with these contaminants.
18. Maintenance of Airport Surfaces
The items in the photograph were picked up from taxi ramps, service areas and runways. These objects present a potential danger to tires and to aircraft.
Airport surfaces require excellent maintenance. If airport surfaces and runways are rough or poorly maintained (holes, cracks, foreign objects) aircraft tires are liable to be damaged. Strict control of hanger, runways, ramps and other field areas is especially important where large, high speed aircraft operate.
Bolts, nuts, rivets, tools and other foreign objects will easily cut into aircraft tires.
Category Link:
Tire Care and Maintenance
- 10. Removal by tire condition other than tread wear
11. Dismounting Bias Tires
12. Dismounting Radial Tires
13. Remounting of tires
14. Tire condition unsuitable for retreading - 15. Matching Tire Diameters
16. Tire Flat-spot
17. Protection from Contamination
18. Maintenance of Airport Surfaces - 19. Tires in Other than Aircraft Service
20. Storage of Tires
21. Handlings of tires
22. Transportation & Storage of Tire/Wheel Assemblies
23. Precautions during Unloading
24. Service Claim Memorandum
