airborne collision avoidance system


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airborne collision avoidance system

[′er‚bȯrn kə′lizh·ən ə′vȯid·əns ‚sis·təm]
(navigation)
A navigation system for preventing collisions between aircraft that relies primarily on equipment carried on the aircraft itself, but which may make use of equipment already employed in the ground-based air-traffic control system. Abbreviated ACAS.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

airborne collision avoidance system (ACAS)

airborne collision avoidance system (ACAS)click for a larger image
Typical function block diagram of 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 (ICAO). The system alerts the pilot to conflicting air traffic.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
In particular, it was suggested, as a matter of urgency, that rules regarding the use of Airborne Collision Avoidance Systems (ACAS) should be made as clear and unambiguous as possible.
However, Eurocontrol last night said both aircraft were ``well within limits'' of the new elevation system, adding that both planes were equipped with airborne collision avoidance systems.
The commitments the merging companies have offered consist of selling the overlapping Airborne Collision Avoidance Systems (ACAS) business (of Honeywell) and civil helicopter radar business (of AlliedSignal).

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