Daily updated organized track system Aircraft fuel consumption and ground speed can be significantly improved by using tailwinds when flying eastwards, and minimizing headwinds when flying westwards, rather than just following the shortest path great circle between two locations. The tracks use a set of fixed entry and exist points at their extremities: Overall structure, with entry and exist points source Those points change over time when the NAT airspace is reorganized, e.
Track system construction The process is collaborative between airlines and ATC. OTS Changeover Period From SKYbrary : To provide a smooth transition between the night-time and the daytime OTS, a period of several hours is allocated between the termination of one system and the commencement of the next.
Improve this answer. Is it randomly or do they follow a specific schedule? Is there a logic behind that? Then the Oceanic Centers compute tracks starting and ending at fixed waypoints, and publish them on NAV Canada website for discussion.
Routes are opened, and aircraft fly for several hours. The difficulty is to change the routes while aircraft are using them. This cannot be done often, and is actually done once a day when traffic direction changes; most aircraft flying East in the morning but West in the evening, due to passenger preferences. Show 1 more comment. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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This is also often the case with ferry flights, which are primarily new or newly purchased small aircraft travelling from the United States or Canada to new owners overseas. Dublin, 28 March ". A lucky escape for two pilots as their C ditches near Baffin Island on an eastbound ferry flight.
Tim Orchard made the fastest ever Concorde crossing of the North Atlantic, and here's how it was done. The world's only dedicated provider of Specialist flight support:. The impact on domestic route structures and the serviceability of transition area radars and navaids are checked before the system is finalised.
These routes can differ slightly from the 'core tracks' in that they may cross each other using vertical separation via different flight level allocations and, in some cases, that they may not extend from coast-out to coast-in requiring the operator to plan a random routing to join or leave the track. If a strong westerly jetstream closely follows the Great Circle of the dominant NAT traffic flow between London and New York, the resulting daytime westbound minimum time tracks can be located both north and south of this great circle.
In such cases Shanwick may publish a "split" track structure allowing sufficient space between the westbound tracks to accommodated random route eastbound traffic.
Following the initial construction of the NAT tracks by the appropriate OCA, the proposed tracks are published on an NAV Canada operated internet site for review and discussion by interested parties. One hour is allocated for this process during which any comments will be considered by the publishing agency and any agreed changes are then incorporated into the final track design. This message is distributed to all interested parties via the AFTN. The NAT Track Message gives full details of the co-ordinates of each track of the OTS as well as the flight levels that are expected to be in use on each of those tracks.
In most cases, there are also details of domestic entry and exit routings associated with individual tracks e. The most northerly track, at its point of origin, of the westbound daytime OTS is designated Track 'A' Alpha with the next most northerly track designated as Track 'B' Bravo and so on.
For the eastbound night-time OTS, the most southerly track, at its point of origin, is designated Track 'Z' Zulu and the next most southerly track is designated Track 'Y' Yankee. The Julian calendar is a simple progression of numbered days, without reference to months, starting from the first day of the year.
TMI A. Correct interpretation of the track message by dispatchers and aircrew is essential. Oceanic airspace outside the published OTS is available to all authorised users, subject to application of the appropriate separation criteria and NOTAM restrictions. It is possible to flight plan to join or leave an outer track of the OTS.
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