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Why should a Traffic Advisory (TA) precede a Resolution Advisory (RA)?
  • A
    A TA will highlight the approximate position of an aircraft nearby that may become an RA.
  • B
    TAs have the ability to create a horizontal traffic avoidance manoeuvre.
  • C
    TAs can create a vertical traffic avoidance manoeuvre.
  • D
    A TA must always be created before an RA.

The Traffic Alert and Collision Avoidance System (TCAS) was developed in order to reduce the risk of mid-air collisions between aircraft. It serves as a last-resort safety net irrespective of any separation standards. ACAS equipment provides two types of advisories to pilots: Resolution Advisories (RAs) and Traffic Advisories (TAs).

  • TA is an actual warning received by the pilot. It gives indication to the flight crew that a certain intruder is a potential threat.
  • RA is an indication to the pilot that a manoeuvre is necessary to provide separation from all threats or there is a need to restrict a manoeuvre and so maintain existing separation.

Note that TAs enhance situational awareness and assist visual acquisition of conflicting traffic. But the visual acquired traffic may differ from the traffic causing a TA.

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