Narrative:

I was the captain and PF [pilot flying] for this leg and while on radar vectors to opf and descending into the terminal area there was a lot of IFR and VFR traffic; the autopilot was engaged and ATC gives us a descent to 2;000 ft from 3000 ft and heading 250; subsequently ATC issued a right turn to heading 280 my copilot in a very concerned manner asked me to stop descending and stop turning because there was traffic a small airplane to our right wing. I complied by disconnecting the autopilot and manually arresting the descent by now copilot asked me to climb and turn in opposite direction to the left because traffic was near the wing tip. I complied and mentioned that I cannot see the traffic and there was no indication of traffic in our TCAS. He questioned the ATC controller and the controller said that he did not know that traffic was near us. Copilot indicated in a very strong voice that we just had a near midair collision by about 300 ft. Controller indicated that traffic was not near us and issue a turn to the west. Copilot indicated that a turn to the west will put us in a collision path with that traffic again. I reiterated again that I was not able to see any traffic as it was near the right wing tip. ATC issue a descent to 1500 and another turn and we landed uneventfully. On the ground I asked the cabin host as she indicated that passengers saw the small airplane near the right wingtip. Passengers were safe and not alarmed as they saw the airplane momentarily. I asked the copilot to write a report with the facts because I never saw the traffic; the TCAS system never alerted of the presence of traffic in the vicinity; or a near miss; we never received a TCAS RA and ATC never issued a near miss or a loss of separation advisory. It is believed that the small airplane involved in the alleged near miss did not have the transponder on or it was not operational. I mentioned to my copilot that I feel our CRM and his clear instructions helped to prevent this situation from escalating into an incident or accident.

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Original NASA ASRS Text

Title: GII flight crew experiences a NMAC with a C172 at 2300 feet while being vectored by MIA Approach Control. The C172 did not have a transponder or it was turned off; as the aircraft was invisible to ATC and the GII TCAS.

Narrative: I was the Captain and PF [Pilot Flying] for this leg and while on radar vectors to OPF and descending into the terminal area there was a lot of IFR and VFR traffic; the autopilot was engaged and ATC gives us a descent to 2;000 FT from 3000 FT and heading 250; Subsequently ATC issued a right turn to HDG 280 my copilot in a very concerned manner asked me to stop descending and stop turning because there was traffic a small airplane to our right wing. I complied by disconnecting the autopilot and manually arresting the descent by now copilot asked me to climb and turn in opposite direction to the left because traffic was near the Wing tip. I complied and mentioned that I cannot see the traffic and there was no indication of traffic in our TCAS. He questioned the ATC controller and the controller said that he did not know that traffic was near us. Copilot indicated in a very strong voice that we just had a NMAC by about 300 ft. Controller indicated that traffic was not near us and issue a turn to the west. Copilot indicated that a turn to the west will put us in a collision path with that traffic again. I reiterated again that I was not able to see any traffic as it was near the right wing tip. ATC issue a descent to 1500 and another turn and we landed uneventfully. On the ground I asked the cabin host as she indicated that passengers saw the small airplane near the right wingtip. Passengers were safe and not alarmed as they saw the airplane momentarily. I asked the copilot to write a report with the facts because I never saw the traffic; the TCAS system never alerted of the presence of traffic in the vicinity; or a near miss; we never received a TCAS RA and ATC never issued a near miss or a loss of separation advisory. It is believed that the small airplane involved in the alleged near miss did not have the transponder on or it was not operational. I mentioned to my copilot that I feel our CRM and his clear instructions helped to prevent this situation from escalating into an incident or accident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.