Description
ICAO DOC 9863 Airborne Collision Avoidance System (ACAS) Manual Ed 3
Notice to users – this document is an unedited version of an ICAO publication and has not yet been approved in final form. As its content may still be supplemented, removed, or otherwise modified during the editing process, ICAO shall not be responsible whatsoever for any costs or liabilities incurred as a result of it use.
In order to meet the demands for more operational flexibility with potential reduction of separations, a new type of ACAS, ACAS X, has been introduced. Implementation of ACAS X is expected to minimize nuisance alerts, while maintaining existing levels of safety. Additionally, ACAS X will be capable of accommodating reduced separation minima, operation of new aircraft types (i.e. RPA) and other new procedures.
This manual has been updated by the Surveillance Panel (SP) as a reference document to supplement ACAS X provisions which will be included in Annex 10 — Aeronautical Telecommunications, Volume IV — Surveillance and Collision Avoidance Systems. This new edition describes general technical guidance, operational differences between ACAS X and the existing ACAS II systems, and operational aspects including recommended training and considerations to intruders with very high vertical rates.
