Narrative:

During practice emergency lndgs at dlz airport, upon turning to a downwind position, a white/red/gold striped arrow PA28 was spotted coming from cmh or osu, at full speed. An immediate descent was initiated as the proximity was sure enough to cause a collision in the event of a turn. I expected the aircraft to be hit at the vertical stabilizer. We felt the propeller wash of the aircraft. The other pilot did not appear to notice. All appropriate calls had been made on the dlz unicom. This area is a high concentration training area. Normal procedures for training in this area have worked well. A call was made to osu tower upon landing to establish the origin of the other aircraft. It was not reported as coming from osu. Had this aircraft come from cmh, it would have received cautionary advisory as several aircraft were in the area. This aircraft was in high speed cruise and did not make any turns after the incident, or any attempt to call on the unicom frequency. I believe the pilot still does not know of the incident. Acknowledgement is made that both aircraft are responsible for VFR separation, despite our altitude exceeding normal traffic pattern altitude. Approaching aircraft have more of a responsibility to look out for aircraft/parachutists, etc.

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Original NASA ASRS Text

Title: PA28 PLT HAD AN NMAC AT AN UNCTLED ARPT.

Narrative: DURING PRACTICE EMER LNDGS AT DLZ ARPT, UPON TURNING TO A DOWNWIND POS, A WHITE/RED/GOLD STRIPED ARROW PA28 WAS SPOTTED COMING FROM CMH OR OSU, AT FULL SPD. AN IMMEDIATE DSCNT WAS INITIATED AS THE PROX WAS SURE ENOUGH TO CAUSE A COLLISION IN THE EVENT OF A TURN. I EXPECTED THE ACFT TO BE HIT AT THE VERT STABILIZER. WE FELT THE PROP WASH OF THE ACFT. THE OTHER PLT DID NOT APPEAR TO NOTICE. ALL APPROPRIATE CALLS HAD BEEN MADE ON THE DLZ UNICOM. THIS AREA IS A HIGH CONCENTRATION TRAINING AREA. NORMAL PROCS FOR TRAINING IN THIS AREA HAVE WORKED WELL. A CALL WAS MADE TO OSU TWR UPON LNDG TO ESTABLISH THE ORIGIN OF THE OTHER ACFT. IT WAS NOT RPTED AS COMING FROM OSU. HAD THIS ACFT COME FROM CMH, IT WOULD HAVE RECEIVED CAUTIONARY ADVISORY AS SEVERAL ACFT WERE IN THE AREA. THIS ACFT WAS IN HIGH SPD CRUISE AND DID NOT MAKE ANY TURNS AFTER THE INCIDENT, OR ANY ATTEMPT TO CALL ON THE UNICOM FREQ. I BELIEVE THE PLT STILL DOES NOT KNOW OF THE INCIDENT. ACKNOWLEDGEMENT IS MADE THAT BOTH ACFT ARE RESPONSIBLE FOR VFR SEPARATION, DESPITE OUR ALT EXCEEDING NORMAL TFC PATTERN ALT. APCHING ACFT HAVE MORE OF A RESPONSIBILITY TO LOOK OUT FOR ACFT/PARACHUTISTS, ETC.

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.