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TIM (transfer initiation message) - signifies the end of the coordination pjase and the start of the transfer phase. Note: The list below contains the most frequently used OLDI messages and the explanations are intended to provide the basic meaning of those messages rather than being a complete description. The OLDI specificcation can be found in the Further Reading section. Aeronautical administrative messages (priority indicator KK) comprise messages regarding the operation or maintenance of facilities, the functioning of aeronautical telecommunication services and those exchanged between civil aviation authorities relating to aeronautical services.
The following categories are accepted for transmission by the aeronautical telecommunication service:
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CDN (coordination message) - sent by the accepting controller as a proposed modification or as a counter-proposal.
REV (revision message) - replaces the verbal revision in case the accepting unit does not change as a result of the modification. On-Line Data Interchange (OLDI) is a protocol for co-ordination and transfer of current flight data between adjacent air traffic control units. Its development started in the 1990s in Europe.The messages to be used and certain parameters thereof are defined in bilateral agreements between the particular ATC units. Related Articles