Plain English Meaning

A quick mental checklist a pilot runs at set points in a flight to check five things that commonly cause problems: the trip itself, the aircraft, themselves, the people on board, and the cockpit equipment they're using.

Full Definition

A single-pilot risk management tool that prompts the pilot to review five categories of risk — the Plan, the Plane, the Pilot, the Passengers, and the Programming (avionics and automation) — at key decision points during a flight, such as preflight, pretakeoff, , , and before .