For a flight departure, when should the final preflight walk-through be completed?

• A. Before boarding begins
• B. After boarding begins
• C. During boarding
• D. After engine start

Answer: (A)

The final preflight walk-through is the last safety check done by the crew to confirm the aircraft is ready for departure. It should be completed before boarding begins so any exterior or interior issues can be found and addressed while the cabin is still unoccupied and before people start loading. This timing lets you verify things like the exterior condition (no ice, debris, or leaks), that flight controls and surfaces move properly, doors and exits are secure, and the cabin is prepared (emergency equipment accounted for, seats and belts in proper positions, baggage secured) without delaying passengers. If you wait until after boarding or after engine start, safety checks would be harder to perform, could disrupt boarding, and could delay or derail the flight.