Flight information region

Flight Information Region

Flight information region

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Description:
A flight information region (FIR) is an aviation term used to describe airspace with specific dimensions, in which a flight information service and an alerting service are provided. It is the largest regular division of airspace in use in the world today.

Any portion of the atmosphere belongs to some specific FIR. Smaller countries' airspace is encompassed by a single FIR, larger countries' airspace is subdivided into a number of regional FIRs. Some FIRs may encompass the territorial airspace of several countries. Oceanic airspace is divided into Oceanic Information Regions and delegated to a controlling authority bordering that region. The division among authorities is done by international agreement through International Civil Aviation Organization (ICAO).

There is no standard size for FIRs, it is a matter for administrative convenience of the country concerned. In some cases there may exist a horizontal division of the FIR, in which case the lower portion remains named as such, whereas the airspace above is named Upper Information Region, or UIR.

An information service and alerting service are the basic levels of air traffic service, providing information pertinent to the safe and efficient conduct of flights and alerting the relevant authorities should an aircraft be in distress. These are available to all aircraft through an FIR. Higher levels of Air Traffic Advisory and Control services may be available within certain portions of airspace within an FIR, according to the...
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