A check. The A check is performed approximately every 400-600 flight hours, or every 200–300 flights, depending on aircraft type. It needs about 50-70 man-hours, and is usually performed in an airport hangar. The A check takes a minimum of 10 hours.

The duration of a flight inspection varies significantly based on the type of check being performed. A standard pre-flight "walk-around" conducted by the pilots or ground crew takes only about 10 to 15 minutes and focuses on visible issues like tire wear, fuel leaks, or loose panels. For a more formal annual inspection of a small private aircraft, the process typically takes 2 to 3 days. This involves deep-diving into the engine, fuel systems, and avionics to ensure the plane meets all airworthiness standards. On the commercial side, "C-checks"—which are heavy maintenance inspections done every 18 to 24 months—can take anywhere from 1 to 3 weeks as the entire aircraft is essentially dismantled and inspected. There are also specialized "Flight Inspection" missions flown by aviation authorities (like the FAA or CAA) to calibrate airport navigation aids like ILS beams; these airborne inspections can take several hours of flight time per runway. Ultimately, the time required is dictated by the aircraft's complexity, its previous maintenance history, and whether any significant issues are uncovered that require immediate repair before the plane can be certified as "ready for flight."