Which factor is not used to determine a safe turning radius for towing a C-17 on the ramp?

• A. Tow bar length
• B. Nose gear geometry
• C. Ramp clearance
• D. Aircraft color

Answer: (D)

Turning radius when towing a C-17 is driven by the aircraft’s physical geometry and the towing setup, not by cosmetic features. The length of the tow bar changes how far the tug is from the nose gear, which directly affects how wide a turn you must make and how much room you need to maneuver safely. The geometry of the nose gear—its wheelbase, steering range, and how the gear pivots—determines how tightly the nose can steer and what turning arc is achievable without causing tire scrub or gear contact. Ramp clearance is about having enough space along the flight line path to accommodate the turning arc, including clearance from ramp edges, equipment, and surface irregularities. Any obstruction or limitation in that space can block a safe turn, so it’s a critical factor. Aircraft color, however, has no bearing on these mechanical or spatial constraints, so it doesn’t factor into calculating a safe turning radius.