Airborne Collision Avoidance System


Airborne Collision Avoidance System

Airborne Collision Avoidance System (ACAS) is an ICAO (International Civil Aviation Organization) standard specified in ICAO Annex 10 Vol IV which provides pilots with a system independent of air traffic control to detect the presence of other aircraft which may present a threat of collision. Where the risk of collision is imminent, the system provides an indication of a manoeuvre that will reduce the risk of collision.

As of 2006, the only implementation that meets the ACAS II standards set by ICAO is Version 7.0 of TCAS II (Traffic Alert and Collision Avoidance System) produced by three manufacturers: Rockwell Collins, Honeywell and ACSS (Aviation Communication & Surveillance Systems; an L-3 Communications and Thales Avionics company).

As of 1973, the United States Federal Aviation Administration (FAA) standard for transponder minimal operational performance, Technical Standards Order (TSO) C74c, contained errors which affect both air traffic control radar beacon system (ATCRBS) "radar" and Traffic Alert and Collision Avoidance System (TCAS) abilities to detect aircraft transponders. First called "The Terra Problem", there have since been individual FAA Airworthiness Directives issued against various transponder manufacturers in an attempt to repair the operational deficiencies, to enable the "newer" radars and TCAS systems to operate. Unfortunately, the defect is in the TSO, and the individual corrective actions to transponders have led to significant differences in the logical behavior of transponders by make and mark, as proven by an FAA study of in-situ transponders.

[http://www.gtwn.net/~keith.peshak/AIS-P.htm AIS-P] is a modification which both corrects the transponder deficiencies (the transponder will respond to all varieties of "radar" and TCAS), then adds an Automatic Independent Surveillance with Privacy augmentation. The AIS-P protocol does not suffer from the saturation issue in high density traffic, does not interfere with the Air Traffic Control (ATC) "radar" system or TCAS, and conforms to the internationally approved Mode S data packet standard. It awaits member country submission to the ICAO as a requested approval.

External links

* [http://www.skybrary.aero/index.php/ACAS ACAS on Skybrary]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Airborne Collision Avoidance System — TCAS Monitor Das Traffic Alert and Collision Avoidance System (TCAS) ist ein Kollisionswarnsystem an Bord eines Luftfahrzeuges. Die ICAO und europäische Bezeichnung lautet Airborne Collision Avoidance System (ACAS). Inhaltsverzeichnis 1… …   Deutsch Wikipedia

  • airborne collision avoidance system — An aircraft system based on SSR (secondary surveillance radar) transponder signals which operates independently of ground based equipments to provide advice to the pilot on potential conflicting aircraft that are equipped with SSR transponders… …   Aviation dictionary

  • collision-avoidance system — A noncooperative system providing cockpit indications of all conflicting traffic. The system is meant to alert the pilot about conflicting air traffic. For this purpose, all involved aircraft must be fitted with a secondary surveillance radar… …   Aviation dictionary

  • Traffic Collision Avoidance System — The Traffic alert and Collision Avoidance System (or TCAS) is an aircraft collision avoidance system designed to reduce the incidence of mid air collisions between aircraft. It monitors the airspace around an aircraft for other aircraft equipped… …   Wikipedia

  • Traffic Alert and Collision Avoidance System — TCAS Display Das Traffic Alert and Collision Avoidance System (TCAS) ist eine Implementierung des Kollisionswarnsystems Airborne Collision Avoidance System (ACAS) an Bord eines Luftfahrzeuges. Die Funktionalität des ACAS wird definiert von der… …   Deutsch Wikipedia

  • Traffic alert and Collision Avoidance System — Un TCAS o Sistema de alerta de tráfico y evasión de colisión (siglas en inglés de Traffic alert and Collision Avoidance System), es un sistema embarcado que prevé posibles colisiones entre diferentes aeronaves y funciona independientemente a los… …   Wikipedia Español

  • Aircraft collision avoidance systems — Modern aircraft can use several types of collision avoidance systems to prevent unintentional contact with other aircraft, obstacles, or the ground:* Airborne Radar can detect the relative location of other aircraft, and has been in military use… …   Wikipedia

  • Joint Tactical Radio System — The Joint Tactical Radio System (JTRS, often pronounced jitters ) is planned to be the next generation voice and data radio used by the U.S. military in field operations after 2010. Launched with a Mission Needs Statement in 1997 and a subsequent …   Wikipedia

  • NATO Airborne Early Warning and Control Programme Management Organisation — Wappen der NAPMO Eine NATO E 3A im Anflug auf den …   Deutsch Wikipedia

  • 1996 Charkhi Dadri mid-air collision — Saudi Arabian Airlines Flight 763 Kazakhstan Airlines Flight 1907 Accident summary Date 12 November 1996 Type Mid air collision caused by pilot error on Kazakhstan Airlines aircraft …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.