When must the owner or Master of a towing vessel retest a towline or remove it from service?

Correct Answer: Option D — When the record of its material condition lapses for 3 months or more.

46 CFR 140.835 requires towing vessels to maintain a record of the material condition of their towlines. If the record of inspection or testing lapses for three months or more, the towline is considered uncertified for service and must be retested or removed from use immediately.