ADS-C is a two-way system that provides comprehensive information critical to flight safety see graphic below. As ADS-C is a contract between the aircraft and air traffic control ATC for regular position reporting, the two-way methodology agreed by ICAO and ATC transmits position reports of the aircraft on an agreed specified frequency, typically between 10 and 14 mins, but moving to shorter intervals of 3. Positioning is just one of the elements of safe air traffic control in the oceans.
In addition, aircraft must be equipped with communications capabilities that can provide a controller-to-pilot datalink service and voice communications — SB-S and Classic Aero services provide all of these services. In contrast, space-based ADS-B is a one-way broadcast of only the position of the airplane.
It does not provide sufficient information to properly separate aircraft over the ocean because aircraft need the aforementioned all-important communications capability and space-based ADS-B does not provide this.
The report outlines that ADS-C technology will continue to be required for the foreseeable future on all flights over the ocean. However, in other parts of the world, the planned implementation of space-based ADS-B will require airlines to pay significantly higher air traffic fees.
The report indicates that this technology is not needed because Inmarsat can provide all the services required for reduced separation standards as published by ICAO. The main differences between ADS-B versus ADS-C revolve around the types of connections, how the systems are used and the ways in which they communicate. Related: A Guide to Aircraft Transponders. If you found this article interesting please take 5 seconds to share this on your favorite social media.
Thanks so much, I really appreciate it! Skip to content. Table of Contents. News: To better serve our users and the aviation safety community, SKYbrary is transitioning to a new, more flexible platform early November , providing users with a better service and easier access to the wealth of safety knowledge it offers. If you wish to access the latest content from the SKYbrary team, please visit and bookmark www. Automatic dependent surveillance — contract ADS-C : means by which the terms of an ADS-C agreement will be exchanged between the ground system and the aircraft, via a data link , specifying under what conditions ADS-C reports would be initiated, and what data would be contained in the reports.
Data provision by an aircraft is generated in response to a request within the terms of the ADS contract held by the ground system. This contract identifies the types of information and the conditions under which reports are to be sent by the aircraft. Some types of information are included in every report, while other types are provided only if specified in an ADS contract request.
An ATSU system may request multiple simultaneous ADS contracts with a single aircraft, including one periodic and one event contract, which may be supplemented by any number of demand contracts.
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