NMAC BTWN AN SMA HELI HOVERING AT THE APCH END OF THE RWY AND A STUDENT PLT IN A C150 APCHING TO LAND. THE CESSNA WAS FOLLOWING THE HELI ON FINAL AND SUDDENLY TURNED AND TOOK EVASIVE ACTION WHEN THE HELI STOPPED RIGHT IN FRONT OF HER BEFORE HOVER TAXIING TO PARKING. THE STUDENT PLT SCRAPED THE L WINGTIP DURING HER EVASIVE MANEUVER.

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ON OCT/THU/97; AT APPROX XA50 PM I WAS RETURNING FROM A PHOTO PROJECT. RADIO CALLED POS ON CTAF AT 13 NM N; 10 NM N; 3 NM N; AND ENTERING FINAL APCH. (EVERYTHING NORMAL EXCEPT IN RETROSPECT I RECALL HEARING A CARRIER RADIO XMISSION WITHOUT VOICE SEVERAL TIMES AS I WAS INBOUND FOR LNDG.) AFTER MAKING A NORMAL APCH TO THE NUMBERS AT RWY 19 TO A HOVER; A C150 WITH A STUDENT PLT FLASHED BY THE R SIDE OF THE FRONT OF MY SHIP AT AN APPROX 60 DEG BANK ANGLE AND LANDED IN FRONT OF ME ON THE RWY. LATER DISCOVERED STUDENT PLT HAD NOT PLUGGED MIKE SIDE OF HEADSET IN COMPLETELY BEFORE TKOF. SHE SAW ME; I DID NOT SEE HER; SHE TURNED FINAL FROM BASE (L) BEHIND ME AND FOLLOWED ME IN. SHE APPARENTLY WAS UNAWARE OF HELIS STOPPING WHEN THEY LAND BEFORE HOVER TAXIING TO THE HANGARS. (I HAD MY ANTI-COLLISION STROBES AND LNDG LIGHTS ON.) SHE DID A GREAT JOB FLYING HER AIRPLANE AROUND ME AND LNDG IT WITH ONLY SCRAPING HER L WING ON THE RWY. I SHOULD HAVE BEEN SUSPICIOUS OF THE RADIO XMISSIONS. I SHOULD HAVE AVOIDED THE AIRPLANE TFC PATTERN EVEN THOUGH I DID NOT SEE OR HEAR OTHER ACFT. I SHOULD HAVE ALSO LANDED OFF THE RWY AWAY FROM AIRPLANE TFC. THE STUDENT PLT SHOULD HAVE PLUGGED IN HER MIKE. SHE SHOULD HAVE GONE AROUND WHEN SHE BEGAN TO GAIN ON THE HELI. HER CFI SHOULD HAVE INSTRUCTED HER FURTHER ON HELI OPS AND TFC AVOIDANCE. I AM THANKFUL TO HAVE BEEN GIVEN ANOTHER CHANCE.