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During cruise, the pilots receive an ACAS Traffic Advisory from an aircraft flying at a lower altitude, climbing towards their altitude. According to the ICAO Doc. 8168, they should…

  • A
    Advise ATC and initiate an avoiding manoeuvre, unless doing so would jeopardise the safety of the aircraft.
  • B
    Use all available information to prepare for appropriate action if a Resolution Advisory occurs.
  • C

    Initiate an avoiding manoeuvre if you visually acquire the other traffic.

  • D
    Initiate an avoiding manoeuvre based on this Traffic Advisory.

ICAO Doc 8168
3.2 USE OF ACAS INDICATORS

The indications generated by ACAS shall be used by pilots in conformity with the following safety considerations:

a) pilots shall not manoeuvre their aircraft in response to traffic advisories (TAs) only;

Note 1.— TAs are intended to alert pilots to the possibility of a resolution advisory (RA), to enhance situational awareness, and to assist in visual acquisition of conflicting traffic. However, visually acquired traffic may not be the same traffic causing a TA. Visual perception of an encounter may be misleading, particularly at night.

Note 2.— The above restriction in the use of TAs is due to the limited bearing accuracy and to the difficulty in interpreting altitude rate from displayed traffic information.

b) on receipt of a TA, pilots shall use all available information to prepare for appropriate action if an RA occurs.

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