Narrative:

I flew over I19 (greene county) at 2500 ft MSL to determine winds/active runway and observe any traffic. There was a single aircraft in the pattern, climbing through several hundred ft on takeoff. This was not the other aircraft involved in the near midair. I then proceeded several mi south to descend to pattern altitude and set up a 45 degree entry to the downwind for runway 25. I was in a left turn to the north, descending through approximately 2000 ft MSL and was searching for the aircraft I had observed at I19 when this incident occurred. I passed almost head on to what appeared to be a PA28 (warrior, archer, etc) approximately 200 ft above and 50 ft to the left of my aircraft. The other aircraft would have been blocked from my view for part of the turn but should have been visible to me long before I saw it. My aircraft should also have been visible to the other pilot. If he or she took any evasive action it was before I saw the other plane. After passing this aircraft, I finally reestablished contact with the one I was looking for which was no factor anymore. I have been flying predominantly IFR lately and obviously need to pay more attention to clearing. I should know better and will correct my performance.

Google
 

Original NASA ASRS Text

Title: NMAC BTWN 2 PIPER PA28 TYPE ACFT JUST NEAR THE TFC PATTERN OF A NON CTLED ARPT. THE RPTR WAS TURNING AND DSNDING TO ENTER THE DOWNWIND LEG ON A 45 DEG ANGLE WHEN HE OBSERVED THE OTHER ACFT COMING ALMOST STRAIGHT BY OVERHEAD!

Narrative: I FLEW OVER I19 (GREENE COUNTY) AT 2500 FT MSL TO DETERMINE WINDS/ACTIVE RWY AND OBSERVE ANY TFC. THERE WAS A SINGLE ACFT IN THE PATTERN, CLBING THROUGH SEVERAL HUNDRED FT ON TKOF. THIS WAS NOT THE OTHER ACFT INVOLVED IN THE NEAR MIDAIR. I THEN PROCEEDED SEVERAL MI S TO DSND TO PATTERN ALT AND SET UP A 45 DEG ENTRY TO THE DOWNWIND FOR RWY 25. I WAS IN A L TURN TO THE N, DSNDING THROUGH APPROX 2000 FT MSL AND WAS SEARCHING FOR THE ACFT I HAD OBSERVED AT I19 WHEN THIS INCIDENT OCCURRED. I PASSED ALMOST HEAD ON TO WHAT APPEARED TO BE A PA28 (WARRIOR, ARCHER, ETC) APPROX 200 FT ABOVE AND 50 FT TO THE L OF MY ACFT. THE OTHER ACFT WOULD HAVE BEEN BLOCKED FROM MY VIEW FOR PART OF THE TURN BUT SHOULD HAVE BEEN VISIBLE TO ME LONG BEFORE I SAW IT. MY ACFT SHOULD ALSO HAVE BEEN VISIBLE TO THE OTHER PLT. IF HE OR SHE TOOK ANY EVASIVE ACTION IT WAS BEFORE I SAW THE OTHER PLANE. AFTER PASSING THIS ACFT, I FINALLY REESTABLISHED CONTACT WITH THE ONE I WAS LOOKING FOR WHICH WAS NO FACTOR ANYMORE. I HAVE BEEN FLYING PREDOMINANTLY IFR LATELY AND OBVIOUSLY NEED TO PAY MORE ATTN TO CLRING. I SHOULD KNOW BETTER AND WILL CORRECT MY PERFORMANCE.

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.