Tyre Serviceability

Cuts Penetration by a foreign object on runways and ramps, or in shops or storage areas. Remove from aircraft if injury extends into fabric.	Spiral Wrap Some retreads have reinforcing cords wound into the tread which become visible as the tyre wears. This is an acceptable condition and not cause for removal. The wrap reduces chevron cutting and tread chunking.
Tread Chunking A condition in the wearing portion of tread usually due to rough or unimproved runways. Remove if fabric is visible.	Tread Separation A separation or void between components in the tread area due to loss of adhesion, usually caused by excessive loads or flex heating from under-inflation. Remove immediately.
Groove Cracking A circumferential cracking at the base of a tread groove; remove if fabric is visible. Can result from under-inflated or overloaded operation, or improper storage conditions.	Rib Undercutting An extension of groove cracking progressing under a tread rib; remove from aircraft. Can lead to tread chunking, peeled rib or thrown tread.
Peeled Rib Usually begins with a cut in tread, resulting in a circumferential delamination of a tread rib, partially or totally, to tread reinforcing ply. Remove from aircraft.	Thrown Tread Partial or complete loss of tread down to tread fabric ply or casing plies. Remove from aircraft.
Skid An oval-shaped flat spot or skid burn in the tread rubber. May extend to or into fabric plies. Remove if balance is affected, fabric is exposed, or tyre is ruptured.	Rubber Reversion An oval-shaped area in the tread similar to a skid, but where rubber shows burning due to hydroplaning during landing usually caused by wet or ice-covered runways. Remove if balance is affected.
Open Tread Splice A crack in the tread rubber where the joint (splice) separates in a radial (sideways) direction. Tyres with this defect should be removed from service.	Chevron Cutting Tread damage caused by running and/or braking on cross-grooved runways. Remove if chunking to fabric occurs or tread cut removal criteria are exceeded.