When using alternate towbars for pushback, use of a ______ is required to ensure adequate clearance between tow vehicle and aircraft.

• A. Designated observer
• B. Wing walker
• C. Safety officer
• D. Pilot

Answer: (A)

The key idea is having a dedicated person whose sole job is to watch the tow path and ensure there is enough space between the tow vehicle and the aircraft during pushback, especially when using alternate towbars. This designated observer provides continuous, independent monitoring and communicates with the tow operator and the aircraft crew to stop or proceed as needed if clearance narrows or hazards appear. Their vantage point and attention to clearance along the fuselage and undercarriage help prevent contact as the aircraft moves.

Wing walkers focus on keeping the wings clear of obstacles, which is important in some situations but not the primary clearance task between the tow vehicle and the aircraft during pushback. A safety officer oversees overall safety programs rather than the day-to-day pushback clearance, and the pilot is in the cockpit rather than serving as the external clearance monitor. So the designated observer is the role that ensures adequate clearance in this scenario.