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the tire. [Figure 13-139]  Consult the aircraft maintenance manual, airline operations manual, or other technical documents applicable to the aircraft tire in question. 

A flat spot on a tire is the result of the tire skidding on the runway surface while not rotating. This typically occurs when the brakes lock on while the aircraft is moving. If the flat spot damage does not expose the reinforcing ply of a bias tire or the protector ply of a radial tire, it may remain in service. However, if the flat spot causes vibration, the tire 

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must be removed. Landing with a brake applied can often cause a severe flat spot that exposes the tire under tread. It can also cause a blowout. The tire must be replaced in either case. [Figure 13-140] 

A bulge or separation of the tread from the tire carcass is cause for immediate removal and replacement of the tire. 

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