What inspection concept is primarily used in the End-of-runway inspection?

The End-of-runway inspection primarily utilizes the phased, periodic, and isochronal inspection concept. This approach is designed to ensure the aircraft's operational readiness and safety before it takes off or after it lands, focusing on key areas that may require immediate attention.

Phased inspections allow for a systematic examination of the aircraft's systems at intervals, ensuring that critical components are frequently checked, enhancing reliability and safety. Periodic inspections involve scheduled maintenance tasks at predetermined intervals, which can help maintain airworthiness over time. Isochronal inspections refer to a planned maintenance schedule that is based on flight hours, ensuring that the aircraft receives regular checks and services at specified intervals, irrespective of the usage frequency.

Using this combination in an End-of-runway inspection allows for thorough oversight of the aircraft’s condition, providing a comprehensive framework for both immediate and scheduled maintenance tasks, making it a critical part of ensuring the safety and performance of the aircraft in operations.

While the other options might refer to various inspection methods, they do not encapsulate the full scope of the End-of-runway inspection as effectively as the combination of phased, periodic, and isochronal methods does.