Question 2 AT01 - Assistance Towing Endorsement

The Correct Answer is D **Explanation for D (Stretches too much) - Correct:** Nylon ropes exhibit extremely high elasticity (stretching capacity). While this characteristic can be advantageous in some low-strain mooring situations (acting as a shock absorber), it is highly dangerous and undesirable for high-load applications like alongside towing. When nylon stretches under load, it stores a tremendous amount of kinetic energy. If the rope or its fittings fail (a situation known as "parting"), the rope snaps back violently ("snaps back" or "whiplash effect"), posing a severe, often lethal, hazard to personnel and causing catastrophic damage to structures on deck. Furthermore, excessive stretch makes precise maneuvering and maintaining a steady towing tension extremely difficult, particularly in close quarters. **Explanation for A (Too difficult to make fast) - Incorrect:** Nylon is a soft, flexible synthetic fiber that handles easily and holds knots well. It is generally no more difficult to secure (make fast) than other common towing lines (like polypropylene or HMPE). **Explanation for B (Parts too readily) - Incorrect:** Nylon is known for its excellent tensile strength and abrasion resistance, making it one of the strongest and most durable synthetic ropes available relative to its size. It is engineered to handle high loads and does not "part too readily" under normal operating conditions. The danger lies in its *behavior* when it parts due to stretching, not its low inherent strength. **Explanation for C (Too susceptible to mildew) - Incorrect:** Nylon is a synthetic fiber. Unlike natural fibers (like manila or cotton), synthetic ropes are inherently resistant to degradation from biological agents such as mildew, mold, and rot. While continuous exposure to dirt and water may eventually require cleaning, susceptibility to mildew is not a factor against its use in towing.