A traffic collision avoidance system or traffic alert and collision avoidance system (both abbreviated as 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 with a corresponding active transponder, independent of air traffic control, and warns pilots of the presence of other transponder-equipped aircraft which may present a threat of mid-air collision (MAC). It is a type of airborne collision avoidance system mandated by the International Civil Aviation Organization to be fitted to all aircraft with a maximum take-off mass (MTOM) of over 5,700 kg (13,000 lb) or authorized to carry more than 19 passengers.
ACAS / TCAS is based on secondary surveillance radar (SSR) transponder signals, and operates independently of ground-based equipment to provide advice to the pilot on potential conflicting aircraft.
In modern glass cockpit aircraft, the TCAS display may be integrated in the Navigation Display (ND) or Electronic Horizontal Situation Indicator (EHSI); in older glass cockpit aircraft and those with mechanical instrumentation, such an integrated TCAS display may replace the mechanical Vertical Speed Indicator (which indicates the rate with which the aircraft is descending or climbing).
Read more about Traffic Collision Avoidance System: Impetus For A Collision Prevention System, TCAS Operation, Safety Aspects of TCAS, Relationship To Automatic Dependent Surveillance-broadcast (ADS-B), Drawbacks To TCAS and ADS-B, Current Implementation
Famous quotes containing the words system, avoidance, traffic and/or collision:
“The dominant metaphor of conceptual relativism, that of differing points of view, seems to betray an underlying paradox. Different points of view make sense, but only if there is a common co-ordinate system on which to plot them; yet the existence of a common system belies the claim of dramatic incomparability.”
—Donald Davidson (b. 1917)
“Real good breeding, as the people have it here, is one of the finest things now going in the world. The careful avoidance of all discussion, the swift hopping from topic to topic, does not agree with me; but the graceful style they do it with is beyond that of minuets!”
—Thomas Carlyle (17951881)
into paper coffee-cups, eaten
with petals on rye in the
sunthe cold shadows in back,
and the traffic grinding the
borders of spring ...”
—Denise Levertov (b. 1923)
“I know my fate. One day my name will be tied to the memory of something monstrousa crisis without equal on earth, the most profound collision of conscience, a decision invoked against everything that had previously been believed, demanded, sanctified. I am no man, I am dynamite!”
—Friedrich Nietzsche (18441900)