The tire restraining device or barrier shall be removed immediately from service for any of these defects EXCEPT

The tire restraining device or barrier shall be removed immediately from service for any of these defects EXCEPT

• A. Cracking
• B. Deformation
• C. Excessive wear
• D. Discoloration

Answer: (D)

The key idea is that a tire restraining device must be taken out of service when its structural integrity is compromised. Cracking signals a fault that can propagate and lead to failure under load. Deformation indicates the device has lost its proper shape and fit, which can prevent it from locking or restraining properly. Excessive wear means the material has thinned or worn down to unsafe levels, reducing strength and effectiveness. Discoloration, by itself, doesn’t necessarily affect the device’s ability to restrain a tire and doesn’t automatically require removal; it can be cosmetic or due to aging or exposure without impacting function. So, discoloration alone doesn’t mandate immediate removal, though you should still inspect for other defects and replace if you find any other signs of damage.

The key idea is that a tire restraining device must be taken out of service when its structural integrity is compromised. Cracking signals a fault that can propagate and lead to failure under load. Deformation indicates the device has lost its proper shape and fit, which can prevent it from locking or restraining properly. Excessive wear means the material has thinned or worn down to unsafe levels, reducing strength and effectiveness. Discoloration, by itself, doesn’t necessarily affect the device’s ability to restrain a tire and doesn’t automatically require removal; it can be cosmetic or due to aging or exposure without impacting function. So, discoloration alone doesn’t mandate immediate removal, though you should still inspect for other defects and replace if you find any other signs of damage.