Narrative:

I was performing touch-and-goes at gxy, an uncontrolled field. It was a busy sunday morning with several surrounding airports also using the CTAF of 122.8. This made the frequency congested and difficult to differentiate traffic at the different airports. I had performed several previous touch- and-goes and was making a full stop landing. I advised traffic of my position and intentions upon each leg of the pattern. Hearing no other traffic for gxy I proceeded to turn base and final, again calling my legs. At about 1/2 mi final and 300-400 ft, a low wing single engine t-tail aircraft passed underneath my aircraft and then proceeded down the final approach before adding power and climbing out as if on a go around. The aircraft showed no sign of seeing my aircraft and never made any radio calls that I can remember. I continued my approach and landed without incident. This is the most dangerous of many in recent history at gxy that have either happened to myself or fellow pilots. I feel the amount of traffic at this airport is such that maintaining the field as uncontrolled is a major safety risk. Even assigning separate frequencys to the airports in the vicinity would help to prevent confusion and congestion of 122.8. Callback conversation with reporter revealed the following information: reporter states his aircraft was a C172 and the other was a seminole. There was no one else around when the incident occurred and so he had no idea whether the other aircraft made a straight-in approach or not. Analyst recommended the use of the FAA hotline.

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Original NASA ASRS Text

Title: C172 PLT ON FINAL APCH AT NON TWR FIELD HAS NMAC WITH ACFT WHICH FLIES BELOW HIM.

Narrative: I WAS PERFORMING TOUCH-AND-GOES AT GXY, AN UNCTLED FIELD. IT WAS A BUSY SUNDAY MORNING WITH SEVERAL SURROUNDING ARPTS ALSO USING THE CTAF OF 122.8. THIS MADE THE FREQ CONGESTED AND DIFFICULT TO DIFFERENTIATE TFC AT THE DIFFERENT ARPTS. I HAD PERFORMED SEVERAL PREVIOUS TOUCH- AND-GOES AND WAS MAKING A FULL STOP LNDG. I ADVISED TFC OF MY POS AND INTENTIONS UPON EACH LEG OF THE PATTERN. HEARING NO OTHER TFC FOR GXY I PROCEEDED TO TURN BASE AND FINAL, AGAIN CALLING MY LEGS. AT ABOUT 1/2 MI FINAL AND 300-400 FT, A LOW WING SINGLE ENG T-TAIL ACFT PASSED UNDERNEATH MY ACFT AND THEN PROCEEDED DOWN THE FINAL APCH BEFORE ADDING PWR AND CLBING OUT AS IF ON A GAR. THE ACFT SHOWED NO SIGN OF SEEING MY ACFT AND NEVER MADE ANY RADIO CALLS THAT I CAN REMEMBER. I CONTINUED MY APCH AND LANDED WITHOUT INCIDENT. THIS IS THE MOST DANGEROUS OF MANY IN RECENT HISTORY AT GXY THAT HAVE EITHER HAPPENED TO MYSELF OR FELLOW PLTS. I FEEL THE AMOUNT OF TFC AT THIS ARPT IS SUCH THAT MAINTAINING THE FIELD AS UNCTLED IS A MAJOR SAFETY RISK. EVEN ASSIGNING SEPARATE FREQS TO THE ARPTS IN THE VICINITY WOULD HELP TO PREVENT CONFUSION AND CONGESTION OF 122.8. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HIS ACFT WAS A C172 AND THE OTHER WAS A SEMINOLE. THERE WAS NO ONE ELSE AROUND WHEN THE INCIDENT OCCURRED AND SO HE HAD NO IDEA WHETHER THE OTHER ACFT MADE A STRAIGHT-IN APCH OR NOT. ANALYST RECOMMENDED THE USE OF THE FAA HOTLINE.

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.