AC 120-55C Air Carrier TCAS - Code7700

2/23/11 AC 120-55CAppendix 5APPENDIX 5. PHRASEOLOGY FOR TCAS EVENTS1. RADIO COMMUNICATION. In order to keep everyone informed during a TCASmaneuver, radio communication should be in terminology common to all parties on thefrequency regarding a TCAS RA. All transmissions should contain:• Name of the ATC facility,• Aircraft identification (ID), and• Nature of the TCAS deviation.2. TCAS RAs. When a flightcrew receives a TCAS RA to either climb or descend from theirassigned altitude, or the RA otherwise affects their ATC clearance, the crew should inform ATCwhen beginning the excursion from clearance or as soon as workload allows in the followingmanner:• “XYZ Center, (Aircraft ID), TCAS RA.”• Example: “New York Center, Quantum 321, TCAS RA.”3. SEPARATION. Following such a communication, the designated air traffic facility is notrequired to provide approved standard separation to the TCAS maneuvering aircraft until theTCAS encounter is cleared and standard ATC separation is achieved. If workload permits, trafficinformation should be provided in accordance with the current edition of FAA Order 7110.65,Air Traffic Control. When the RA is clear, the flightcrew should advise ATC that they arereturning to their previously assigned clearance or subsequent amended clearance in thefollowing manner:• “ABC Center, (Aircraft ID), clear of conflict, returning to assigned altitude.”• Example: “Boston Center, Northern 429, clear of conflict, returning to assigned altitude.”4. RENEGOTIATED CLEARANCES. When the deviating aircraft has renegotiated itsclearance with ATC, the designated air traffic facility should resume providing appropriateseparation services in accordance with FAA Order JO 7110.65.NOTE: No communication is required if the pilot is able to satisfy the RAguidance and maintain the appropriate ATC clearance.Page 1 (and 2)