Narrative:

Our aircraft with a multi-engine student pilot in the left seat, an instrument in the right seat and an observer in the rear seat had entered the traffic pattern on a left upwind and called our position on unicom. All landing lights and taxi lights were turned on at this point. Approximately 1/4 mi beyond the west end of runway 26 we turned onto a left crosswind and reported this over unicom frequency. At this point an small aircraft X reported entering left downwind and was spotted by the flight crew of our aircraft. We turned downwind and reported over unicom doing so. All occupants of our aircraft were keeping our eye on the small aircraft X to avoid overtaking him on downwind along with looking for other traffic. At the midfield downwind position small aircraft Y apparently was attempting to enter the pattern at a 45 degree downwind entry. He was first spotted by the flight crew of our aircraft when he was at our 3 O'clock position and 50-100' away from us, heading 70-80 degrees directly towards us. At this point I took over the controls from the student and executed an evasive maneuver consisting of a sharp right, descending turn. Small aircraft Y made a climbing left turn to the best of our knowledge. At this point both aircraft re-entered left upwinds and proceeded in to land. Our aircraft confign at tme of near miss: rotating beacon - on, strobe lights - on, landing lights (2) - on, taxi light (1) on.

Related reports:

Google
 

Original NASA ASRS Text

Title: NMAC.

Narrative: OUR ACFT WITH A MULTI-ENG STUDENT PLT IN THE LEFT SEAT, AN INSTR IN THE RIGHT SEAT AND AN OBSERVER IN THE REAR SEAT HAD ENTERED THE TFC PATTERN ON A LEFT UPWIND AND CALLED OUR POS ON UNICOM. ALL LNDG LIGHTS AND TAXI LIGHTS WERE TURNED ON AT THIS POINT. APPROX 1/4 MI BEYOND THE W END OF RWY 26 WE TURNED ONTO A LEFT XWIND AND RPTED THIS OVER UNICOM FREQ. AT THIS POINT AN SMA X RPTED ENTERING LEFT DOWNWIND AND WAS SPOTTED BY THE FLT CREW OF OUR ACFT. WE TURNED DOWNWIND AND RPTED OVER UNICOM DOING SO. ALL OCCUPANTS OF OUR ACFT WERE KEEPING OUR EYE ON THE SMA X TO AVOID OVERTAKING HIM ON DOWNWIND ALONG WITH LOOKING FOR OTHER TFC. AT THE MIDFIELD DOWNWIND POS SMA Y APPARENTLY WAS ATTEMPTING TO ENTER THE PATTERN AT A 45 DEG DOWNWIND ENTRY. HE WAS FIRST SPOTTED BY THE FLT CREW OF OUR ACFT WHEN HE WAS AT OUR 3 O'CLOCK POS AND 50-100' AWAY FROM US, HDG 70-80 DEGS DIRECTLY TOWARDS US. AT THIS POINT I TOOK OVER THE CONTROLS FROM THE STUDENT AND EXECUTED AN EVASIVE MANEUVER CONSISTING OF A SHARP RIGHT, DSNDING TURN. SMA Y MADE A CLBING LEFT TURN TO THE BEST OF OUR KNOWLEDGE. AT THIS POINT BOTH ACFT RE-ENTERED LEFT UPWINDS AND PROCEEDED IN TO LAND. OUR ACFT CONFIGN AT TME OF NEAR MISS: ROTATING BEACON - ON, STROBE LIGHTS - ON, LNDG LIGHTS (2) - ON, TAXI LIGHT (1) ON.

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.