Select the correct timing for finishing the final preflight walk-through.

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

Answer: (B)

Finish the final preflight walk-around before any passengers start boarding so the aircraft is confirmed safe and ready while the cabin is still unoccupied and systems aren’t yet powered. This timing lets you spot and address exterior issues—like leaks, tire condition, control surface movement, or discrepancies in faring and panels—without the interference of passengers or engine operation. If you wait until boarding has begun, you risk delaying passengers, creating hazards near a live aircraft, and complicating any needed corrective actions. Performing the walk-around after engine start defeats the purpose of the preflight check, because issues found then could require aborting or delaying the flight and pose additional safety risks with a running engine.