GM2 ATS.TR.155(c)(9) ATS
surveillance services
ED Decision 2020/008/R
SHORT-TERM
CONFLICT ALERT (STCA) PROCEDURES
The generation of STCAs is a function based on surveillance data, integrated into an air traffic control system. The objective of the STCA function is to assist the air traffic controller in preventing collision between aircraft by generating, in a timely manner, an alert of a potential or actual infringement of separation minima. Procedures and related instructions concerning the use of the STCA function should specify, inter alia:
(a) the types of flight which are eligible for generation of alerts;
(b) the sectors or areas of airspace within which the STCA function is implemented;
(c) the method of displaying the STCA to the air traffic controller;
(d) in general terms, the parameters for generation of alerts as well as alert warning time;
(e) the volumes of airspace within which STCA can be selectively inhibited and the conditions under which this will be permitted;
(f) conditions under which specific alerts may be inhibited for individual flights; and
(g) procedures applicable in respect of volume of airspace or flights for which STCA or specific alerts have been inhibited.
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