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Care and Maintenance
Tread
RIB UNDERCUTTING
PHENOMENON
Rubber cracks happen at the "wall" of the "tread-rib" in tread grooves. The cracks spread underneath the ribs.
POSSIBLE CAUSES
An extension of groove cracking progressing under a tread rib which can lead to tread chunking, peeled rib or thrown tread.
RECOMMENDATION
The tire shall be removed from aircraft as soon as the crack extends under the rib.