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At the majority of aerodromes where ATS is provided, there is an AFTN station. A number of such stations grouped together and around an AFTN centre form an AFTN circuit. Service messages (priority indicator as appropriate). This category comprises messages originated by aeronautical fixed stations to obtain information or verification concerning other messages which appear to have been transmitted incorrectly by the aeronautical fixed service.

Coordination (dialogue procedure). This procedure provides facilities for communication and negotiation between controllers in the coordination phase and for communication in the transfer phase. The ACT and REV messages described above may also be used for this procedure. The OpenLDI standard was promoted by National Semiconductor, Texas Instruments, Silicon Graphics (SGI) and others. OpenLDI wasn't used in many of the intended applications after losing the computer-to-monitor interconnect application to a competing standard, Digital Visual Interface (DVI). [1]TIM (transfer initiation message) - signifies the end of the coordination pjase and the start of the transfer phase. Flight regularity messages (priority indicator GG) comprise e.g. messages concerning aircraft servicing, non-routine landings, aircraft arrival or departure, parts and materials urgently required for the operation of aircraft, etc.

the three-letter designator identifying the organization (as seen in ICAO Doc 8585). If no such designator is allocated, YYY is used (YXY for military organizations). For aircraft in flight, ZZZ is used.The messages to be used and certain parameters thereof are defined in bilateral agreements between the particular ATC units. Related Articles A worldwide system of aeronautical fixed circuits provided, as part of the aeronautical fixed service, for the exchange of messages and/or digital data between aeronautical fixed stations having the same or compatible communications characteristics.

The AFTN uses two types of aeronautical fixed stations - AFTN communication centres and AFTN stations. The AFTN communication centre is an AFTN station whose primary function is to relay AFTN messages to or from a number of other interconnected AFTN stations. Distress messages (priority indicator SS). This message category comprises messages sent by aircraft reporting that they are threatened by imminent danger and all other messages relative to the immediate assistance. NAN (next authority notified) - notifies the accepting unit that it can initiate a CPDLC start request. TIP (tactical instructions proposal) - used by the transferring unit to coordinate the transfer of a flight on an assigned heading, speed, rate of climb or descent or on a direct routing.REV (revision message) - replaces the verbal revision in case the accepting unit does not change as a result of the modification.