AMC1 ATS.TR.155(c)(2) ATS surveillance services
ED Decision 2020/008/R
POSITION INFORMATION
(a) An aircraft provided with ATS surveillance services should be informed of its position in the following circumstances:
(1) upon identification, except when the identification is established:
(i) based on the pilot’s report of the aircraft position or within one nautical mile of the runway upon departure and the observed position on the situation display is consistent with the aircraft’s time of departure; or
(ii) by use of ADS-B aircraft identification, Mode S aircraft identification or assigned discrete SSR codes and the location of the observed position indication is consistent with the current flight plan of the aircraft; or
(iii) by transfer of identification;
(2) when the pilot requests this information;
(3) when a pilot’s estimate differs significantly from the air traffic controller’s estimate based on the observed position;
(4) unless otherwise prescribed by the competent authority, when the pilot is instructed by the air traffic controller to resume own navigation after vectoring if the current instructions had diverted the aircraft from a previously assigned route; and
(5) when air traffic control service is provided, immediately before termination of ATS surveillance services if the aircraft is observed to deviate from its intended route.
(b) Position information should be passed on to aircraft in one of the following forms:
(1) as a well-known geographical position;
(2) magnetic track and distance to a significant point, an en-route navigation aid, or an approach aid;
(3) direction (using points of the compass) and distance from a known position;
(4) distance to touchdown if the aircraft is on final approach; or
(5) distance and direction from the centre line of an ATS route.
(c) Whenever practicable, position information should relate to positions or routes pertinent to the navigation of the aircraft concerned and shown on the situation display map.
EASA regulations mandate air traffic controllers to provide aircraft position information during surveillance services. This includes initial identification (unless specific criteria are met), pilot requests, significant estimate discrepancies, resuming own navigation after vectoring, and before terminating surveillance if deviating from the route. Position updates use geographical points, track/distance, direction/distance, or route references.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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