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A TCAS Resolution Advisory (RA) requires a deviation from an ATC clearance. The pilot should report to the ATC controller as soon as practicable after he/she starts to deviate. How should this be done? The call sign plus...
  • A
    "TCAS TA".
  • B
    "TCAS RA".
  • C
    "TCAS Alert".
  • D
    "TCAS Conflict".

ICAO Doc 4444
12.3 ATC Phraseologies

Circumstances Pilot ATC (controller)
After a flight starts to deviate from any ATC clearance or instruction to comply with a TCAS RA TCAS RA ROGER
After the response to a TCAS RA is completed and a return to the ATC clearance or instruction is initiated CLEAR OF CONFLICT. RETURNING TO (assigned clearance) ROGER (or alternative instruction)
After the response to a TCAS RA is completed and the assigned ATC clearance or instruction has been resumed CLEAR OF CONFLICT (assigned clearance) RESUMED ROGER (or alternative instruction)
After an ATC clearance or instruction contradictory to the TCAS RA is received, the flight crew will follow the RA and inform ATC directly UNABLE, TCAS RA ROGER

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