Air Operator Certificate (AOC)
A certificate authorising an operator to carry out specified commercial air transport operations. Airborne Collision Avoidance System (ACAS)
Equipment aboard an aircraft that provides an audible and visual warning when there is a threat of collision with another aircraft.
Equivalent Terms: Traffic Collision Avoidance System (TCAS)

Aircraft
Any machine that can derive support in the atmosphere from the actions of the air. Equivalent Terms: Airplane, Aeroplane, Helicopter
Aircraft Access Doors
Doors that provide access to the passenger cabin or lower compartment(s), which may be actuated manually or by electrical, hydraulic or pneumatic means.

Aircraft Component
Any part or equipment for an aircraft that when fitted to, or provided in an aircraft may, if it is not sound or functioning correctly, affect the safety of the aircraft, its occupants or its cargo or cause the aircraft to become a danger to person or property; or flotation equipment, evacuation equipment, ration packs, portable breathing apparatus, fire-fighting equipment or any other equipment or apparatus fitted to, or provided in, an aircraft for use in an emergency.
Equivalent Terms: Component, Aircraft Part, Part Aircraft Ground Movement
Operations associated with moving of an aircraft on the ground, to include aircraft taxi, pushback, aircraft powerback, aircraft power-out (power-in), or aircraft towing.
See Aircraft Pushback, Aircraft Powerback, Aircraft Power-out (Power-in) and Aircraft Towing. Aircraft Handling
Activities associated with servicing of an aircraft on the ground, including aircraft access, equipment attachment and removal, and operation of vehicles and equipment in the immediate vicinity of the aircraft.