Narrative:

The incident occurred in 2/88 at approximately xxoo local time at the plattsmouth municipal airport. A student pilot and myself, a CFI, were practicing takeoffs, patterns and lndgs at plattmouth. 1 additional aircraft was in the traffic pattern. We were on a left base leg to runway 16, descending to land, and had transmitted our position. We were about 2000' MSL, 800' AGL, when an small aircraft Y startled my student. When I spotted the small aircraft Y it was just off of our nose and quickly passed from right to left. The small aircraft Y was visible through the lower left portion of the windscreen and window, near the line between the plexiglas and the metal. The small aircraft Y passed at approximately 4 wing lengths distance, and was heading approximately 110. He apparently was on a cross country flight. The small aircraft Y heading to be within 500' of either the ground, us or both based upon our altitude and his relative position to us. Such proxs may be in violation of far's 91.79 and 91.65. The registration number was XXXX. Continuing with the incident, I executed a climbing right hand turn to avoid any collision hazards. I rolled out to witness the small aircraft Y ground track and registration number. I was well outside of 10 wing lengths during the witnessing. My opinion is that a safety minded pilot should not fly near airports at or below the recommended traffic pattern altitude of 1000'. The pilot exercised poor judgement and nearly created an accident by flying within the plattsmouth traffic pattern. Unfortunately, far's do not prohibit such conduct at uncontrolled airports, such as plattsmouth municipal. Maybe some sort of an airport traffic area should be established by uncontrolled airports.

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Original NASA ASRS Text

Title: NMAC BETWEEN 2 GA-SMA'S AND LOW FLT BY ONE GA-SMA.

Narrative: THE INCIDENT OCCURRED IN 2/88 AT APPROX XXOO LCL TIME AT THE PLATTSMOUTH MUNI ARPT. A STUDENT PLT AND MYSELF, A CFI, WERE PRACTICING TKOFS, PATTERNS AND LNDGS AT PLATTMOUTH. 1 ADDITIONAL ACFT WAS IN THE TFC PATTERN. WE WERE ON A LEFT BASE LEG TO RWY 16, DSNDING TO LAND, AND HAD TRANSMITTED OUR POS. WE WERE ABOUT 2000' MSL, 800' AGL, WHEN AN SMA Y STARTLED MY STUDENT. WHEN I SPOTTED THE SMA Y IT WAS JUST OFF OF OUR NOSE AND QUICKLY PASSED FROM RIGHT TO LEFT. THE SMA Y WAS VISIBLE THROUGH THE LOWER LEFT PORTION OF THE WINDSCREEN AND WINDOW, NEAR THE LINE BTWN THE PLEXIGLAS AND THE METAL. THE SMA Y PASSED AT APPROX 4 WING LENGTHS DISTANCE, AND WAS HDG APPROX 110. HE APPARENTLY WAS ON A XCOUNTRY FLT. THE SMA Y HDG TO BE WITHIN 500' OF EITHER THE GND, US OR BOTH BASED UPON OUR ALT AND HIS RELATIVE POS TO US. SUCH PROXS MAY BE IN VIOLATION OF FAR'S 91.79 AND 91.65. THE REGISTRATION NUMBER WAS XXXX. CONTINUING WITH THE INCIDENT, I EXECUTED A CLBING RIGHT HAND TURN TO AVOID ANY COLLISION HAZARDS. I ROLLED OUT TO WITNESS THE SMA Y GND TRACK AND REGISTRATION NUMBER. I WAS WELL OUTSIDE OF 10 WING LENGTHS DURING THE WITNESSING. MY OPINION IS THAT A SAFETY MINDED PLT SHOULD NOT FLY NEAR ARPTS AT OR BELOW THE RECOMMENDED TFC PATTERN ALT OF 1000'. THE PLT EXERCISED POOR JUDGEMENT AND NEARLY CREATED AN ACCIDENT BY FLYING WITHIN THE PLATTSMOUTH TFC PATTERN. UNFORTUNATELY, FAR'S DO NOT PROHIBIT SUCH CONDUCT AT UNCTLED ARPTS, SUCH AS PLATTSMOUTH MUNI. MAYBE SOME SORT OF AN ARPT TFC AREA SHOULD BE ESTABLISHED BY UNCTLED ARPTS.

Data retrieved from NASA's ASRS site as of August 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.