A Flight Information Region (FIR) is an airspace with specific dimensions, in which an information service and an alert service are provided. Airspace means the portion of the atmosphere controlled by a particular country on top of its territory and territorial waters or, more generally, any specific portion of the atmosphere. ...
Any portion of the atmosphere belongs to some specific FIR which is serviced by a designated authority. The division among authorities is done through ICAO. The International Civil Aviation Organization (ICAO), an agency of the United Nations, develops the principles and techniques of international air navigation and fosters the planning and development of international air transport to ensure safe and orderly growth. ...
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.
The Athens FlightInformationRegion (“FIR”) was agreed to at the Regional Air-Traffic Conferences of 1950, 1952, and 1958.
Nevertheless, Turkey continues to violate the Athens FIR with her military aircraft under the pretext that the Chicago Convention does not concern military aircraft.
Once again, it is perhaps no coincidence that the difficulties created by Turkey concerning the FlightInformationRegion began in 1974, after the Cyprus invasion, when Turkey turned her full attention to the Aegean.
A focused pulse from a transducer 5 of circular cross-section produces an ultrasonic pulse 10 that focuses to an area of diameter 20, at a depth 30, and having a depth of field 40 that may be calculated from known characteristics of the transducer, immersion medium and material to be insonified.
Thus, the time of flight signal would change from showing a peak at the interface (in the case of insufficient diffusion) to showing no peak once diffusion has progressed across the interface, and the microstructure in the region of the interface has resulted in a random orientation of grain boundaries.
The information can be displayed two-dimensionally or three-dimensionally as an image of cross sectional area representing the locations in the volume being evaluated and time-of-flight as a color or gray-scale; a region of uniform color or gray.
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