Narrative:

I was established in the downwind leg of landing at beaver island airport (sjx), st james, mi. I entered the pattern on the upwind leg, completed the crosswind leg and then the downwind leg, announcing all phases over the unicom frequency. A twin small aircraft approach from the rear at a 30-40 degree angle on the right side of our aircraft. The person in the right seat (a pilot with approximately 220 hours total time and approximately 20 hours in type) looked back and saw the twin small aircraft appearing to be moving away from our aircraft, distance approximately less than 1/4 mi. A passenger looked back and made a remark about the aircraft. I could not see anything. The right seat pilot looked and saw the small aircraft twin coming directly to us on a 30-40 degree angle off the tail. The right seat occupant announced he had the controls and made a steep evasive maneuver to the right. The 2 aircraft came to within approximately 100' of each other. One passenger said all they could see out the windows (3 windows) was airplane. We took a position behind the small aircraft twin, entered final, after the small aircraft twin overtook our aircraft. The small aircraft twin did a go around as he was too close to the aircraft in front. We landed and parked continuing to monitor the frequency and looking for the small aircraft twin. It made at least 1 more go around and we think it never did land. The local fire departure was sponsoring a fishfry fly in that day that had attracted at least 300 aircraft. At the time of the incident there were numerous aircraft in the pattern.

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Original NASA ASRS Text

Title: CLOSE PROX 2 GA ACFT AT NON TWR ARPT. ONE USING CTAF THE OTHER APPARENTLY NOT.

Narrative: I WAS ESTABLISHED IN THE DOWNWIND LEG OF LNDG AT BEAVER ISLAND ARPT (SJX), ST JAMES, MI. I ENTERED THE PATTERN ON THE UPWIND LEG, COMPLETED THE XWIND LEG AND THEN THE DOWNWIND LEG, ANNOUNCING ALL PHASES OVER THE UNICOM FREQ. A TWIN SMA APCH FROM THE REAR AT A 30-40 DEG ANGLE ON THE RIGHT SIDE OF OUR ACFT. THE PERSON IN THE RIGHT SEAT (A PLT WITH APPROX 220 HRS TOTAL TIME AND APPROX 20 HRS IN TYPE) LOOKED BACK AND SAW THE TWIN SMA APPEARING TO BE MOVING AWAY FROM OUR ACFT, DISTANCE APPROX LESS THAN 1/4 MI. A PAX LOOKED BACK AND MADE A REMARK ABOUT THE ACFT. I COULD NOT SEE ANYTHING. THE RIGHT SEAT PLT LOOKED AND SAW THE SMA TWIN COMING DIRECTLY TO US ON A 30-40 DEG ANGLE OFF THE TAIL. THE RIGHT SEAT OCCUPANT ANNOUNCED HE HAD THE CONTROLS AND MADE A STEEP EVASIVE MANEUVER TO THE RIGHT. THE 2 ACFT CAME TO WITHIN APPROX 100' OF EACH OTHER. ONE PAX SAID ALL THEY COULD SEE OUT THE WINDOWS (3 WINDOWS) WAS AIRPLANE. WE TOOK A POSITION BEHIND THE SMA TWIN, ENTERED FINAL, AFTER THE SMA TWIN OVERTOOK OUR ACFT. THE SMA TWIN DID A GO AROUND AS HE WAS TOO CLOSE TO THE ACFT IN FRONT. WE LANDED AND PARKED CONTINUING TO MONITOR THE FREQ AND LOOKING FOR THE SMA TWIN. IT MADE AT LEAST 1 MORE GO AROUND AND WE THINK IT NEVER DID LAND. THE LOCAL FIRE DEP WAS SPONSORING A FISHFRY FLY IN THAT DAY THAT HAD ATTRACTED AT LEAST 300 ACFT. AT THE TIME OF THE INCIDENT THERE WERE NUMEROUS ACFT IN THE PATTERN.

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.