Cessna 210 Centurion / Turbo Centurion 210C; 210D
Flight Crew Instrument; Flight Crew Private
Flight Crew Last 90 Days 15; Flight Crew Total 285; Flight Crew Type 112
Situational Awareness
Conflict Airborne Conflict
General None Reported / Taken
Human Factors
I was VFR at 11;500 feet; west of CVG; not communicating with Cincinnati approach; but monitoring their frequency. I saw a passenger jet approaching from my 10 o'clock; approximately 6 miles; 11;000 feet. This was confirmed by ADS-B TCAS; which showed the other aircraft was descending. I maintained visual separation; no action necessary. I then heard approach ask the other aircraft if he had a visual on traffic '12 o'clock; indicating 11;600 feet.' Which would have been my position relative to his aircraft. I could hear no responses from the other aircraft; but approach continued to ask if he had a visual on traffic; even after the jet passed my position. The jet passed approximately 500 feet below my aircraft.Because of the time of day and aircraft positions; the sun was likely obscuring my aircraft from view; contributing to the other pilot's inability to get a visual on traffic.Flying with VFR flight following or on an IFR flight plan would have opened communications between myself and Cincinnati; which would have allowed a confirmation of my position to approach; and vectoring traffic for further separation.
C210 pilot reported an air carrier aircraft passed about 500 feet below his aircraft in the vicinity of CVG airport.