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  1. 1. TCAS
  2. 2. TCAS HISTORY • 1956 - Two planes collided over the Grand Canyon • 1974 - Alternative airborne version using transponders • Beacon-Based Collision Avoidance System (BCAS) • 1981 - The FAA chose to pursue the onboard design • BCAS was renamed TCAS • 1986 - While TCAS still in development, collision occurred • 1993 - Congress mandate all carrier acft operating w/in US • 1997 - Final major change to the TCAS logic, version 7
  3. 3. GENERAL IDEAS  Increasing aircraft collision.  Supplement radar information system early 70s.  It bases its operation on the signals emitted by the transponder.
  4. 4. GENERAL IDEAS  Assists the pilot in preventing midair collisions.  The system interrogates the transponders of other aircraft using his responses to determine the flight paths of each.  With this information it discriminates between traffic that may be at risk and those without.
  5. 5. Traffic Advisory • A TA indicates that an aircraft • is a potential threat • RA may be necessary w/in, approx, the next 25 sec • most commonly displayed as a yellow circle
  6. 6. Resolution Advisory • An RA indicates that an aircraft • Is a threat • displayed as a red square • accompanied by a recommended vertical maneuver.