During pre-flight checks, what is assessed to ensure safety before engine start?

The assessment of strap and buckle integrity is a critical safety measure during pre-flight checks before engine start. Ensuring that all safety straps and buckles are secure helps prevent injury to the pilot in case of sudden maneuvers or turbulence once airborne. This step ensures that the pilot can maintain control of the aircraft without the risk of being ejected or experiencing excessive movement within the cockpit, which is vital for safe operation.

While overall aircraft weight, weather conditions, and pilot readiness are also important elements of pre-flight preparation, they serve different purposes. Evaluating weight helps ensure the aircraft is within limits for safe flight, checking weather conditions ensures the pilot is aware of any hazards they might face during the flight, and assessing pilot readiness takes into account the pilot's mental and physical state. However, the integrity of safety equipment directly relates to the immediate safety of the pilot and should be prioritized before engine start.