GM1 to AMC3 ATS.TR.155(c)(1) ATS surveillance services

• ED Decision 2020/008/R found in: ATM/ANS Provision of Services (2017/373) (Mar 2025)

GM1 to AMC3 ATS.TR.155(c)(1) ATS surveillance services ED Decision 2020/008/R METHODS OF IDENTIFICATION — TRANSFER OF IDENTIFICATION (a) When applying the identification method described in point (b)(6) of [AMC3 ATS.TR.155(c)(1)](#_DxCrossRefBm647742543), attention is to be paid to any errors which might occur due to parallax effects. (b) When applying the identification method described in point (b)(7) of AMC3 ATS.TR.155(c)(1), caution is to be exercised before transferring identification using this method, particularly if other position indications are observed on similar headings and in close proximity to the aircraft to which air traffic services are provided. Inherent radar deficiencies, such as inaccuracies in bearing and distance of the radar position indications displayed on individual situation displays and parallax errors, may cause the indicated position of an aircraft in relation to the known point to differ between the two situation displays. The air traffic services provider may therefore prescribe additional conditions for the application of this method, e.g.: (1) a maximum distance from the common reference point used by the affected air traffic controller(s)/FIS officer(s)/AFIS officer(s), as applicable; and (2) a maximum distance between the position indication as observed by the accepting air traffic controller/FIS officer/AFIS officer and the one stated by the transferring air traffic controller/FIS officer/AFIS officer. (c) The use of procedures in points (b)(8) and (b)(9) of AMC3 ATS.TR.155(c)(1) requires prior coordination between the air traffic controllers/FIS officers/AFIS officers, since the indications to be observed by the accepting air traffic controller/FIS officer/AFIS officer are of short duration. GM1 to AMC3 ATS.TR.155(c)(1) ATS surveillance services ED Decision 2020/008/R METHODS OF IDENTIFICATION — TRANSFER OF IDENTIFICATION (a)       When applying the identification method described in point (b)(6) of [AMC3 ATS.TR.155(c)(1)](#_DxCrossRefBm1726555366), attention is to be paid to any errors which might occur due to parallax effects. (b)       When applying the identification method described in point (b)(7) of AMC3 ATS.TR.155(c)(1), caution is to be exercised before transferring identification using this method, particularly if other position indications are observed on similar headings and in close proximity to the aircraft to which air traffic services are provided. Inherent radar deficiencies, such as inaccuracies in bearing and distance of the radar position indications displayed on individual situation displays and parallax errors, may cause the indicated position of an aircraft in relation to the known point to differ between the two situation displays. The air traffic services provider may therefore prescribe additional conditions for the application of this method, e.g.: (1)       a maximum distance from the common reference point used by the affected air traffic controller(s)/FIS officer(s)/AFIS officer(s), as applicable; and (2)       a maximum distance between the position indication as observed by the accepting air traffic controller/FIS officer/AFIS officer and the one stated by the transferring air traffic controller/FIS officer/AFIS officer. (c)       The use of procedures in points (b)(8) and (b)(9) of AMC3 ATS.TR.155(c)(1) requires prior coordination between the air traffic controllers/FIS officers/AFIS officers, since the indications to be observed by the accepting air traffic controller/FIS officer/AFIS officer are of short duration.