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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".

Looking at the answer options:

“TCAS TA” → INCORRECT. The aircraft has received an RA (resolution advisory) and not a TA (traffic advisory)

“TCAS RA” → CORRECT. As shown in the table below. The ‘RA’ is spoken as the constituent letters, and not phonetically.

“TCAS Alert” → INCORRECT. The correct phraseology is TCAS RA

“TCAS Conflict” → INCORRECT. The correct phraseology is TCAS RA

ICAO Doc 4444
12.3 ATC Phraseologies

CircumstancesPilotATC (controller)
After a flight starts to deviate from any ATC clearance or instruction to comply with a TCAS RATCAS RAROGER
After the response to a TCAS RA is completed and a return to the ATC clearance or instruction is initiatedCLEAR 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 resumedCLEAR OF CONFLICT (assigned clearance) RESUMEDROGER (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 directlyUNABLE, TCAS RAROGER

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