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US A333 PIT
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Leading Cause Of Tire Bursts

Wed Aug 06, 2003 11:39 pm

What are the leading causes for bursting tires? Is it hard landing, rejected takeoffs, or seomthing else?
 
sims747
Posts: 17
Joined: Tue Aug 05, 2003 4:43 am

RE: Leading Cause Of Tire Bursts

Thu Aug 07, 2003 12:14 am

The leading cause for tire bursts under normal operations (apart from FOD obviously...) is underinflation of the tire. Underinflation causes excessive flex in the tire when the aircraft is rolling (i.e. a specific point on the aircraft tire is constantly "loaded and flexed" and "unloaded and unflexed" while the aircraft is rolling). This is similar to metal fatigue and causes a weakening of the tire. To further aggravate the problem, the constant flexing of the tire generates a significant amount of heat, which cannot be neglected and contributes to the degradation of the tire.

It should be noted that tire retread seperations are more frequent than actual tire bursts. Aircraft tires are certified to be retreaded a fixed number of times (around 12 ) once the tread is worn to limits. Tire retreads fail exactly as described above (flexing generating fatigue and heat which degrades the retread) apart from the fact that the tire carcass remains intact. Tire retread seperation mostly happen on takeoff when the centrifugal force (generated by the speed at which the aircraft is travelling) are important enough to provoke the failure of the already weakened retread.

Regds,
Sims
 
avioniker
Posts: 1100
Joined: Tue Jan 01, 2002 5:38 am

RE: Leading Cause Of Tire Bursts

Thu Aug 07, 2003 2:51 am

That "fixed number" has fallen by the wayside. If there is any number associated with a tire carcass it'll be the maximum number of times it may be retredded. It's almost exclusively examination and NDT that determines class 86 action on the tire carcass.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533

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