NMAC BTWN A ROBINSON HELI R22; H1P; AND A C152 BOTH CONDUCTING TRAINING MANEUVERS UNDER THE DIRECTION OF INSTRUCTORS AT 400 FT AGL IN AN OPEN UNCTLED AIRSPACE AREA. THE RPTR IN THE R22 HELI TOOK EVASIVE ACTION TO AVOID THE C152 COMING RIGHT AT HIM.

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I WAS ON A ROUTINE TRAINING IN AN R22 HELI WITH A HIGH TIME AIRPLANE PLT CAPT. WHILE CONDUCTING NORMAL TFC PATTERNS IN THE PRACTICE AREA AT AND BELOW 500 FT AGL; A FELLOW HELI INSTRUCTOR WARNED ME OF A LOW FLYING FIXED WING IN THE AREA APPEARING TO OPERATE HAZARDOUSLY. AFTER A WHILE THE COMPANY HELI DEPARTED AND I REPOSITIONED TO HIS LOCATION. WHILE ON A TKOF RUN; I SUDDENLY SPOTTED THE SAME ACFT MENTIONED PREVIOUSLY HEADED STRAIGHT FOR US. HE APPEARED TO BE DSNDING INTO OUR CLB. I TOOK THE CTLS AND ENGAGED IN EVASIVE MANEUVERS. THE PLANE STILL APPEARED ON A COLLISION COURSE. SO TO PREVENT COLLISION; I ENTERED AUTOROTATION AS A QUICK DSCNT TACTIC AND COULD HEAR THE AIRPLANE'S ENG DUE TO OUR PROX. I IMMEDIATELY ATTEMPTED COM THROUGH FREQS 123.025; 123.45; 123.30 TO ALERT THE FIXED WING. ONLY RESPONSE WAS FROM ANOTHER AIRPLANE WHO ALSO OBSERVED THE C152'S OPS. THE AIRPLANE (C152) CONTINUED TO FLY WITHIN DANGEROUS PROX TO OUR PATTERN BTWN 400 FT AND BELOW. WE FINALLY DEPARTED THE AREA IN FEAR OF OUR SAFETY AND OBSERVED HIS SUBSEQUENT DEP TOWARD FXE. I FINALLY GOT HIS IDENT NUMBER OVER TWR 120.9 AND LEARNED THAT IT WAS FBO'S. I MADE A LNDG ON THEIR RAMP; APCHED PLT. HE KNEW WHY I WAS THERE AND JOKINGLY SAID WE GOT A LITTLE CLOSE. I LEARNED THAT HE WAS AN EXAMINER GIVING A COMMERCIAL CHKRIDE. I WANTED TO MAKE HIM AWARE OF OUR ONGOING HELI OPS IN THAT AREA SO HE COULD KEEP AN EYE OUT. HIS LACK OF CONCERN WARRANTED ME TO CALL THE SCHOOL LATER AND AGAIN MAKE THEM EXTRA AWARE THAT HELIS SHARE THE AREA AND TO PAY ATTN TO OUR POSSIBLE PRESENCE.