Light Transport; Low Wing; 2 Turbojet Eng
Other / Unknown
Conflict Airborne Conflict
Air Traffic Control Issued Advisory / Alert; Flight Crew Took Evasive Action
Airspace Structure; Human Factors
We were on the GAVNN FOUR Arrival into CVG approaching GAVNN. ATC instruction was to cross GAVNN at 10;000 FT. ATC gave a traffic alert of a VFR target over GAVNN at 9;500 FT and climbing. Acquired target on TCAS and monitored. ATC instructed us to stop descent at 12;000 FT; but it was already too late as we were below that altitude. ATC then said we could just stop at 11;000 FT. We still monitored TCAS and target continued to climb. A TCAS TA went off and eventually; around 200 FT vertical separation a TCAS Climb RA was given. As pilot flying; I applied maximum thrust and immediately initiated a climb to comply with the RA. ATC was notified of the RA. Captain said he saw aircraft as we passed and it looked like a high wing Cessna. We got clear of conflict at 12;000 FT and leveled off. [We] continued to destination with no further disruptions.
Descending via the GAVNN arrival; ATC cleared us to descend to 10;000 FT. As we were descending; ATC informed us that he had a target at our 11 O'clock and climbing. He was not in communication with him. As we were descending through 12;000 FT; he instructed us to level at 12;000 or if unable; level at 11;000 FT. We leveled at 11;000 FT over GAVIN. Our TCAS gave us a TA. Shortly there after I told the First Officer we should start climbing to 12;000. He concurred. As soon as I started transmitting that request to ATC; we got an RA to climb. The First Officer did a great job in responding to the TCAS climb. I informed ATC of the TCAS climb. I observed a single engine Cessna approximately 500 FT below us at our 10 O'clock. We were clear of the aircraft and resumed our descent without further incident.
Air Carrier flight crew experiences a TCAS RA on the GAVNN 4 arrival to CVG after being advised of VFR traffic by ATC. The descent is stopped at 11;000 FT and a climb initiated.