Airside
The movement area of an airport, adjacent terrain and building or portions thereof, access to which is controlled.

Airside Safety Training
Training designed to ensure an acceptable level of safety by personnel in the performance of duties in the airside areas of an airport.

Airport Operations Area (AOA)
All restricted ground areas of an airport, including taxiways, runways, loading ramps and parking areas.

Airworthiness
A quality that conforms to aircraft type design or properly altered condition for safe operations and: ƒ in the case of an aircraft, is fitness for flight;
ƒ in the case of aircraft engines, components or parts, when fitted to an aircraft will maintain the aircraft's fitness for flight.
Airworthiness Certificate See Certificate of Airworthiness.
Airworthiness Data
Data issued by the aircraft, engine or component original equipment manufacturer (OEM) or an NAA that is to be used during the maintenance of aircraft, engines and components.

Airworthiness Directive (AD)
A directive issued by an NAA that requires specific action within a specific time frame for specified aircraft, engines or components. ADs are usually issued to address a current or possible deficiency.

Airworthiness Release
A certification in accordance with the applicable authority as it applies to the completion of a particular check (e.g. Service Check, ‘A’ Check, ‘C’ Check, ‘D’ Check, 30K Check, Special Inspection, engine change, major repair, or major repair or major alteration).
Equivalent Terms: Certificated Release to Service, Release To Service

Airworthy
Meeting type design, and in condition for safe flight.

All-cargo Aircraft
An aircraft configured for only the transport of cargo (i.e. no passenger compartment). Equivalent Terms: Cargo-only Aircraft

Alternate Airport
An airport to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or to land at the airport of intended landing. Alternate airports include the following: