Narrative:

I was en route from I67 to luk and had just leveled off between 2800-2900 ft. I was aware that the cvg, class B floor was 3000 ft. I thought that I spotted my friend in another mooney at my 10-11 O'clock position at my same altitude. He had taken off from I67 right before me and was en route to luk. We had been in communication on a CTAF, and he was also level at 2800 ft. However, as I got closer to this airplane, I realized that this was not a mooney, but a commuter regional jet. There was no relative motion between the jet and myself. The regional jet started making a right turn towards me and appeared to be on a collision course. I took evasive action by a climbing right turn to 3200 ft. The rj appeared to pass below me by 400-500 ft. I knew that I violated the class B airspace for approximately 30-45 seconds, but I felt it was necessary to avoid a potential conflict. After the rj passed below me, I immediately exited the class B and descended to 2500 ft. If I did not climb, the proximity of the jet would have been much closer and a potential collision may have occurred in my judgement. I only had several seconds to react when the jet turned towards me. I was VFR at the time and not in contact with ATC. To prevent this from happening in the future, I will contact cincinnati approach even if VFR, in an area of busy traffic. Also, cruising at 2800 ft may have been too close to the floor of the class B (3000 ft) and didn't give me much room to maneuver. 2500 ft probably would have been a better altitude with a 500 ft cushion instead of 200 ft.

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Original NASA ASRS Text

Title: M20P PLT HAD LESS THAN LEGAL SEPARATION WITH AN RJ. THE PLT WAS ATTEMPTING TO FLY FORMATION WITH ANOTHER MOONEY AND MISTOOK THE RJ FOR THE MOONEY.

Narrative: I WAS ENRTE FROM I67 TO LUK AND HAD JUST LEVELED OFF BTWN 2800-2900 FT. I WAS AWARE THAT THE CVG, CLASS B FLOOR WAS 3000 FT. I THOUGHT THAT I SPOTTED MY FRIEND IN ANOTHER MOONEY AT MY 10-11 O'CLOCK POS AT MY SAME ALT. HE HAD TAKEN OFF FROM I67 RIGHT BEFORE ME AND WAS ENRTE TO LUK. WE HAD BEEN IN COM ON A CTAF, AND HE WAS ALSO LEVEL AT 2800 FT. HOWEVER, AS I GOT CLOSER TO THIS AIRPLANE, I REALIZED THAT THIS WAS NOT A MOONEY, BUT A COMMUTER REGIONAL JET. THERE WAS NO RELATIVE MOTION BTWN THE JET AND MYSELF. THE REGIONAL JET STARTED MAKING A R TURN TOWARDS ME AND APPEARED TO BE ON A COLLISION COURSE. I TOOK EVASIVE ACTION BY A CLBING R TURN TO 3200 FT. THE RJ APPEARED TO PASS BELOW ME BY 400-500 FT. I KNEW THAT I VIOLATED THE CLASS B AIRSPACE FOR APPROX 30-45 SECONDS, BUT I FELT IT WAS NECESSARY TO AVOID A POTENTIAL CONFLICT. AFTER THE RJ PASSED BELOW ME, I IMMEDIATELY EXITED THE CLASS B AND DSNDED TO 2500 FT. IF I DID NOT CLB, THE PROX OF THE JET WOULD HAVE BEEN MUCH CLOSER AND A POTENTIAL COLLISION MAY HAVE OCCURRED IN MY JUDGEMENT. I ONLY HAD SEVERAL SECONDS TO REACT WHEN THE JET TURNED TOWARDS ME. I WAS VFR AT THE TIME AND NOT IN CONTACT WITH ATC. TO PREVENT THIS FROM HAPPENING IN THE FUTURE, I WILL CONTACT CINCINNATI APCH EVEN IF VFR, IN AN AREA OF BUSY TFC. ALSO, CRUISING AT 2800 FT MAY HAVE BEEN TOO CLOSE TO THE FLOOR OF THE CLASS B (3000 FT) AND DIDN'T GIVE ME MUCH ROOM TO MANEUVER. 2500 FT PROBABLY WOULD HAVE BEEN A BETTER ALT WITH A 500 FT CUSHION INSTEAD OF 200 FT.

Data retrieved from NASA's ASRS site as of July 2007 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.