Narrative:

Approaching from the west, I monitored the lanninburg -- maxton (meb) CTAF (unicom 122.8) for several mins and then, as I entered the downwind (left, for runway 05), a cessna citation taxied out and briefly spoke with the FBO on 122.8. The FBO then advised me of the citation and I responded and then advised the citation that we were turning onto a 3 mi left base for runway 05 (I had extended the downwind to allow for his departure): the citation acknowledged and departed after advising us of his departure path. I then turned final and announced that we were on a 3 mi final for runway 05. Several seconds later we heard a cessna (small aircraft Y) announce that he was on a 5 mi final for runway 05 and we immediately advised him that we were on a 3 mi final. This was the first transmission from (small aircraft Y). He then repeated that he was on a 5 mi final and we advised him that we were then on a 1 1/2 mi final. Our indicated airspeed was approximately 150 statute mph since I had elected to keep the speed up as long as possible to assure good separation between us and the following cessna (small aircraft Y) (a cessna 150 it was later learned). Almost immediately (small aircraft Y) passed under us from right to left, approximately 100 ft below and announced that he was going to go out and re-enter the traffic pattern since he didn't have us in sight. I advised him of our relative position and landed without further contact. I inquired on the ground and was told that the pilot of (small aircraft Y) was a student. Several mins later (small aircraft Y) taxied out again and I flagged them down and the gentleman in the right seat idented himself as the flight instructor of the pilot who had been flying (small aircraft Y) and stated that, while he had not been in the plane on the last flight, he had recently given that person flight instruction and idented him as a private pilot. I never saw nor spoke with the pilot, although I did speak again with his instructor when he phoned for me at the FBO the next day. It seems to me that the pilot of (small aircraft Y) was unsure of his exact position in relation to both the approach end of runway 05 as well as the traffic pattern itself. In addition, it appeared that he was flying a right base for runway 05 or that he was actually ahead of us on final and to the right when he turned back to the left and under us. He apparently was not monitoring the CTAF or he would have heard the xmissions between us, the FBO, the citation and our pattern announcements. Also, he apparently did not fly the standard traffic pattern.

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Original NASA ASRS Text

Title: NMAC BTWN 2 SMA IN UNCTLED TFC PATTERN ON FINAL APCH.

Narrative: APCHING FROM THE W, I MONITORED THE LANNINBURG -- MAXTON (MEB) CTAF (UNICOM 122.8) FOR SEVERAL MINS AND THEN, AS I ENTERED THE DOWNWIND (LEFT, FOR RWY 05), A CESSNA CITATION TAXIED OUT AND BRIEFLY SPOKE WITH THE FBO ON 122.8. THE FBO THEN ADVISED ME OF THE CITATION AND I RESPONDED AND THEN ADVISED THE CITATION THAT WE WERE TURNING ONTO A 3 MI L BASE FOR RWY 05 (I HAD EXTENDED THE DOWNWIND TO ALLOW FOR HIS DEP): THE CITATION ACKNOWLEDGED AND DEPARTED AFTER ADVISING US OF HIS DEP PATH. I THEN TURNED FINAL AND ANNOUNCED THAT WE WERE ON A 3 MI FINAL FOR RWY 05. SEVERAL SECONDS LATER WE HEARD A CESSNA (SMA Y) ANNOUNCE THAT HE WAS ON A 5 MI FINAL FOR RWY 05 AND WE IMMEDIATELY ADVISED HIM THAT WE WERE ON A 3 MI FINAL. THIS WAS THE FIRST XMISSION FROM (SMA Y). HE THEN REPEATED THAT HE WAS ON A 5 MI FINAL AND WE ADVISED HIM THAT WE WERE THEN ON A 1 1/2 MI FINAL. OUR INDICATED AIRSPD WAS APPROX 150 STATUTE MPH SINCE I HAD ELECTED TO KEEP THE SPD UP AS LONG AS POSSIBLE TO ASSURE GOOD SEPARATION BTWN US AND THE FOLLOWING CESSNA (SMA Y) (A CESSNA 150 IT WAS LATER LEARNED). ALMOST IMMEDIATELY (SMA Y) PASSED UNDER US FROM R TO L, APPROX 100 FT BELOW AND ANNOUNCED THAT HE WAS GOING TO GO OUT AND RE-ENTER THE TFC PATTERN SINCE HE DIDN'T HAVE US IN SIGHT. I ADVISED HIM OF OUR RELATIVE POS AND LANDED WITHOUT FURTHER CONTACT. I INQUIRED ON THE GND AND WAS TOLD THAT THE PLT OF (SMA Y) WAS A STUDENT. SEVERAL MINS LATER (SMA Y) TAXIED OUT AGAIN AND I FLAGGED THEM DOWN AND THE GENTLEMAN IN THE R SEAT IDENTED HIMSELF AS THE FLT INSTRUCTOR OF THE PLT WHO HAD BEEN FLYING (SMA Y) AND STATED THAT, WHILE HE HAD NOT BEEN IN THE PLANE ON THE LAST FLT, HE HAD RECENTLY GIVEN THAT PERSON FLT INSTRUCTION AND IDENTED HIM AS A PVT PLT. I NEVER SAW NOR SPOKE WITH THE PLT, ALTHOUGH I DID SPEAK AGAIN WITH HIS INSTRUCTOR WHEN HE PHONED FOR ME AT THE FBO THE NEXT DAY. IT SEEMS TO ME THAT THE PLT OF (SMA Y) WAS UNSURE OF HIS EXACT POS IN RELATION TO BOTH THE APCH END OF RWY 05 AS WELL AS THE TFC PATTERN ITSELF. IN ADDITION, IT APPEARED THAT HE WAS FLYING A R BASE FOR RWY 05 OR THAT HE WAS ACTUALLY AHEAD OF US ON FINAL AND TO THE R WHEN HE TURNED BACK TO THE L AND UNDER US. HE APPARENTLY WAS NOT MONITORING THE CTAF OR HE WOULD HAVE HEARD THE XMISSIONS BTWN US, THE FBO, THE CITATION AND OUR PATTERN ANNOUNCEMENTS. ALSO, HE APPARENTLY DID NOT FLY THE STANDARD TFC PATTERN.

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.