When should a pilot perform a preflight checklist?

Performing a preflight checklist before starting the engine or taxiing is essential for ensuring a safe and efficient flight. This timing allows the pilot to verify that all equipment and systems are functioning properly and that the aircraft is ready for operation. By completing the checklist before engine start, the pilot can identify any potential issues while on the ground, which is critical for preventing malfunctions or emergencies that might arise during the flight.

This phase of the checklist is vital for assessing fuel levels, control surfaces, and safety equipment, among other things. It serves as a thorough review to ensure that all preparations have been made and that the aircraft meets the required safety standards before it moves from a stationary position. Addressing concerns now is much safer than waiting until after the engine has been started or while taxiing, where distractions might complicate the situation. Moreover, doing this before departure aligns with established safety protocols and operational procedures.