Road hazard, curbing, equipment damage, wash rack rails, pit rails, vandalism, etc.
If damage has not exposed ply cords, tyre may be run out on dual positions. If the cords are visible, repair the tyre if damage to the cords is within repair limits and return to service; otherwise scrap tyre.
Ensure the tyre does not come in contact with vehicle hardware.
If similar damage occurs on several tyre, investigate vehicle operations to determine the cause of the damage.