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.