What does a pre-flight inspection entail?

A pre-flight inspection involves a systematic check of various aircraft components to ensure their airworthiness before flight. This comprehensive process typically includes examining the airframe, engines, controls, and systems to identify any potential issues that could compromise the safety and efficiency of the aircraft during operation. The focus is on verifying that all parts are functioning correctly and meet regulatory standards for safe flying. This inspection is crucial for ensuring that the aircraft is safe for takeoff, and it helps prevent mechanical failures during flight.

The other options do not capture the full scope of what a pre-flight inspection entails. A simple check of cabin conditions does not address the mechanical and operational aspects of the aircraft itself, while reviewing pilot credentials pertains to assessing the qualifications of the personnel rather than the aircraft. Evaluating in-flight service readiness is relevant during the flight rather than before takeoff and does not relate to the aircraft's physical readiness.