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New ICAO publication (Doc 9863)

Doc 9863, Airborne Collision Avoidance System (ACAS) Manual. Third edition, 2021.


This manual has been developed by the Surveillance and Conflict Resolution Systems Panel (SCRSP) (now known as the Surveillance Panel (SP)). On 2 June 2005, the Air Navigation Commission approved Recommendation 1/2 of the first meeting of the SCRSP relating to the publication of this manual which is a compendium of information on various technical and operational aspects of the airborne collision avoidance system (ACAS).


The material contained in this manual supplements ACAS Standards and Recommended Practices (SARPs) and procedures contained in Annex 10 — Aeronautical Telecommunications, Volume IV — Surveillance and Collision Avoidance Systems, Procedures for Air Navigation Services — Air Traffic Management (PANS-ATM, Doc 4444) and Procedures for Air Navigation Services — Aircraft Operations (PANS-OPS, Doc 8168). Guidance provided in this manual includes a detailed description of ACAS and associated technical and operational issues in order to facilitate correct operation and operational monitoring, as well as training of personnel.