Final answer:
Tire inspection for groove cracks should lead to removal from service if cracks are 1/16 inch or greater or show exposed steel or fabric, as these may be covered by a warranty.
Step-by-step explanation:
When inspecting the crown/tread area of a tire, if groove cracks are found they should be carefully assessed. Tires with groove cracks that are consistently 1/16 inch or greater in depth should be removed from service, as this may indicate a problem covered by a warranty. This is particularly critical if the groove cracks have exposed steel or fabric, which can signify severe wear or tire damage necessitating immediate attention.