Tyres Creeping on Wheel Rims
Join Date: Oct 2000
Location: South West UK
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An interesting thread! I run a flying school in UK and one of our PA28s had a tyre deflate on landing this weekend, the tyre had certainly rotated on the rim and torn the valve stem from the tube; this could of course be a result of the deflation rather than its cause.
I suspect however a combination of low tyre pressure and a heavy foot on the brake pedal at touchdown caused the tyre to creep. I have certainly seen tyre creep over the years but usually as a gradual phenomenon which is visualised by the creep marks and can be corrected by re-setting the tyre on the rim as noted above. I've never seen it actually cause a failure like this, has anybody else, particularly on light aeroplanes?
I suppose there is a disadvantage of toe brakes in that there is always a risk of the pilot accidentally applying some pressure when intending to make a rudder input, bring back the Hunter!
As an aside, the braking system on my Airbus 320 stops the wheels when gear is selected up and I've always understood it to be normal practice to stop the wheels before raising the gear on any aeroplane.
Happy landings (with the brakes off!)
3 point
I suspect however a combination of low tyre pressure and a heavy foot on the brake pedal at touchdown caused the tyre to creep. I have certainly seen tyre creep over the years but usually as a gradual phenomenon which is visualised by the creep marks and can be corrected by re-setting the tyre on the rim as noted above. I've never seen it actually cause a failure like this, has anybody else, particularly on light aeroplanes?
I suppose there is a disadvantage of toe brakes in that there is always a risk of the pilot accidentally applying some pressure when intending to make a rudder input, bring back the Hunter!
As an aside, the braking system on my Airbus 320 stops the wheels when gear is selected up and I've always understood it to be normal practice to stop the wheels before raising the gear on any aeroplane.
Happy landings (with the brakes off!)
3 point
Join Date: Nov 2006
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Tyre creep is a well known phenomenum by us engineers (26 yrs) It is especially apparant on newly fitted tyres. I have always placed creep markers on all tyres which I have fitted to aircraft that I service and found some amazing results doing so. I now work for the large european aircraft manufacturing company and can confirm that all wheel brakes are applied during retraction on all our aircraft. This is done using the aircraft brake system on the main gear and brakes shoe fitted in the roof of the NLG bay, Not only does this reduce the chance of creep but lessens the gyroscopic effects of a spinning wheel in the bay, I recommend application of creep marks but the concern is minimal if using tubeless tyres although it is a good indicator as wheel tyres are carfully placed onto wheels to take account of heavy spots etc and tyre movement can cause severe balance issues.
