Originally Posted by
2 sheds
Yes - and no! ICAO states the phrases RADAR CONTACT as well as IDENTIFIED. Under Termination of Service, there is a sort of implication that the latter term is relevant to ADS-B, but that "radar" is still appropriate for the specific use of radar.
2 s
At the risk of perpetuating this thread, I can't agree. 'Radar Contact' is in the definitions section only, but the text in the body of the document states that the pilot shall be informed that they are identified (the means of identification are not specified, therefore not relevant). There is no mention that a pilot be informed that the identification or any other form of 'contact' is by radar. Should one go into that level of detail about the form of surveillance then why not state which of the many forms of radar the flight is identified via? - again it's not relevant, nor does the pilot care. Indeed, ATM systems are moving towards ditching screen symbology that indicate which type/s of surveillance a flight is currently being detected by, to one where the position symbol indicates the standard or quality of surveillance, which in turn dictates applicable separation standards and other ATS service capabilities. So in future, ATC may well not know which source of surveillance is providing the data used to generate a position symbol, only the quality of that data.
Also, I can't read into Doc 4444 that termination of service has an ADS-B implication - it is all about termination of surveillance service, regardless of what form that surveillance takes. Note that a flight can continue to remain identified as it transitions from one form of surveillance to another, which happens many thousands of times daily throughout the world, and often dozens of times for an individual flight, particularly longer transcontinentals.