Flight Hour means each hour or part thereof elapsing from the moment at which the wheels of the Aircraft (or other aircraft in the case of Parts or Engines temporarily installed on such other aircraft) leave the ground on the take-off of the Aircraft (or such other aircraft) until the wheels of the Aircraft (or such other aircraft) touch the ground on the landing of the Aircraft (or such other aircraft) following such take-off.
Aircraft means any machine that can derive support in the atmosphere from the reactions of the air other than the reactions of the air against the earth’s surface;
Airframe means the fuselage, booms, nacelles, cowlings, fairings, airfoil surfaces including rotors (but excluding propellers and rotating airfoils of a powerplant) and landing gear of an aircraft and their accessories and controls;
APU means the auxiliary power unit of the Aircraft.
airframes means airframes (other than those used in military, customs or police services) that, when appropriate aircraft engines are installed thereon, are type certified by the competent aviation authority to transport: