POSSIBLE CAUSES
Groove cracking may result from environmental aggression of the rubber (ozone attack for example) or from an excessive mechanical solicitation, insufficient inflation of the tire. These cracks occur at the bottom of the tread groove pattern.
RECOMMENDATION
The tire shall be removed from the aircraft if:
- the groove cracking exposes the reinforcing fabric (bias) or aramid cord protector (radial).
- the groove cracking is under cutting the adjacent rib.
Tires with minor groove cracking may continue in service.
