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Terms for subject Aviation (2593 entries)

airside	the movement area of an airport, including adjacent terrain and buildings or portions thereof, where access is controlled
airside	the part of an airport which is beyond passport controls and so is only meant to be open to the travelling public and to bona fide airport and airline staff.
airside	The movement area of an airport, adjacent terrain and buildings or portions thereof, access to which is controlled.
airspace classification	The division of the Canadian Domestic Airspace (CDA) into seven classes, each identified by a single letter: A, B, C, D, E, F or G. The application of any classification to an airspace structure determines the operating rules, the level of ATC service provided within the structure and, in some instances, communications and equipment requirements. The horizontal and vertical limits of airspace are described in the Designated Airspace Handbook (DAH) Class A airspace Controlled high-level airspace within which only IFR flight is permitted and ATC separation is provided to all aircraft. The vertical dimensions of Class A high level controlled airspace are as follows: (i) Southern Control Area (SCA) 18 000 ft ASL to FL 600 inclusive; (ii) Northern Control Area (NCA) FL 230 to FL 600 inclusive; and (iii) Arctic Control Area (ACA) FL 270 to FL 600 inclusive. (b) Class B airspace Controlled low-level airspace within which both IFR and VFR flights are permitted and ATC separation is provided to all aircraft. Class B low level controlled airspace is all airspace above 12 500 ft ASL, or at and above the minimum en route altitude (MEA) whichever is higher, up to, but not including, 18 000 ft ASL. Terminal control areas (TCA) and associated primary control zones may also be classified as Class B airspace. (c) Class C airspace Controlled airspace within which both IFR and VFR flights are permitted, but VFR flights require a clearance to enter. ATC separation is provided to all IFR aircraft and, as necessary to resolve possible conflicts, between IFR and VFR aircraft. TCAs and associated primary control zones may be classified as Class C airspace. (d) Class D airspace Controlled airspace within which both IFR and VFR flights are permitted, but VFR flights must establish two-way communications with the appropriate ATC agency prior to entering the airspace. ATC separation is provided only to IFR aircraft. TCAs and associated primary control zones may be classified as Class D airspace. (e) Class E airspace Controlled airspace within which both IFR and VFR flights are permitted, but VFR flights do not have to establish two-way communications with the appropriate ATC agency prior to entering the airspace. ATC separation is provided only to IFR aircraft. All high level controlled airspace above FL 600 within the SCA, NCA and ACA is Class E airspace. Also, low level airways, low level fixed area navigation (RNAV) routes, control area extensions, transition areas, or control zones established without an operating control tower may be classified as Class E airspace. (f) Class F airspace Special-use airspace that may be a restricted area, an advisory area, military operations areas or danger areas and can be controlled airspace, uncontrolled airspace or a combination of both. It is described in terms of horizontal and vertical dimensions, effective for a specified period of time. Although both IFR and VFR flights are permitted in Class F airspace, restricted-airspace access is not authorized without the approval of the user/controlling agency, and advisory-area access is normally reserved for participating aircraft. Non-participating flights should avoid flight within advisory areas, and ATC will not clear non-participating IFR aircraft into an active advisory area. Rules for special-use airspace are as specified in the DAH, and, if not specified, or when the area is not active, the appropriate rules for the surrounding airspace apply. (g) Class G airspace Airspace within which IFR and VFR flights are not subject to control. Airspace shall be classified as Class G if it has not been designated as A, B, C, D, E or F.
Airspace Control Order (Document that details all approved airspace requests. The ACO will complement the ATO cycle and serve as the single planning document for airspace considerations)	ACO
airspace structure	The structure that defines the physical dimensions of the elements into which the airspace is divided, such as control zones (CZ) terminal control areas (TCA) control area extensions (CAE) and airways. The dimensions of airspace structure elements are described in the Designated Airspace Handbook (DAH)
airspeed	The uncorrected reading on the airspeed indicator
airstart	The starting of an aircraft engine while the aircraft is airborne
airstrip	strip
airway	The controlled airspace within the boundaries or along the tracks specified in the Designated Airspace Handbook
airway beacon	A beacon used to mark airway segments in remote mountain areas. The light flashes Morse Code to identify the beacon site.
AIS product	Aeronautical information provided in the form of the elements of the Integrated Aeronautical Information Package (except NOTAM and PIB) including aeronautical charts, or in the form of suitable electronic media.
Al RM ET	Short-term meteorological information intended primarily for aircraft in flight, to notify pilots of potentially hazardous weather conditions not described in the current area forecast and not requiring a SIGMET. The criteria for issuing an AIRMET are the unforeseen development, dissipation or non- occurrence of forecast (a) instrument meteorological conditions (IMC) broken or overcast cloud condition at less than 1000 ft AGL and/or visibility less than 3 SM; (b) freezing precipitation (not requiring a SIGMET) moderate icing; (d) moderate turbulence; (e) thunderstorms (isolated as opposed to a line) an increase in the surface mean wind over a large area to 20 kt or more, or an increase in gusts to 30 kt or more, when no winds were originally forecast; or (g) a difference between the forecast and observed wind direction greater than 60°.
alert notice	A message requesting that communications search be expanded to all potential landing sites in the defined search area
alert phase	A phase that begins when (a) following the uncertainty phase, the communication search has failed to reveal any news of the aircraft; (b) an aircraft has been cleared to land and fails to land within 5 min after the estimated time of landing and communication has not been re-established with the aircraft; or (c) information has been received that indicates that the operating efficiency of the aircraft has been impaired, but not to the extent that a forced landing is likely
alert phase	A situation wherein apprehension exists as to the safety of an aircraft and its occupants
alert phase	A situation wherein apprehension exists as to the safety of an aircraft and its occupants.
alerting post	Any facility intended to serve as an intermediary between a person reporting an emergency and a rescue coordination centre or rescue subcentre.
alerting service	A service provided by ATS units to notify appropriate organizations regarding aircraft in need of search and rescue (SAR) aid and to assist such organizations as required. This service also includes the alerting of crash equipment, ambulances, doctors, and any other safety services.
alerting service	A service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid, and assist such organizations as required.