A PA28 INSTRUCTOR AND STUDENT PRACTICING LNDGS AT PVG EXPERIENCED A NEAR MISS WITH AN R22 HELI INSTRUCTOR AND A STUDENT.

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MY STUDENT AND I WERE PRACTICING LNDGS ON RWY 28 AT PVG. AS THE NOSE OF THE PIPER ARCHER WAS JUST TOUCHING DOWN; I NOTICED THE SKIDS OF HELI ON MY WINDSHIELD. THE HELI WAS DSNDING QUICKLY IN A NOSE HIGH ATTITUDE. I TOOK CTL OF THE AIRPLANE; AND APPLIED MAXIMUM BRAKING; AS I KEYED THE PTT SHOUTING; 'HELI WHAT ARE YOU DOING? GO GO GO GO.' THE HELI HESITANTLY HOVERED FORWARD; NOT UP; NOT SIDEWAYS; ONLY FORWARD. WHEN I FINALLY GOT THE ACFT PARALLEL WITH THE CTRLINE; AFTER BRAKING PULLED THE PLANE SEVERELY TO THE L; I CAME TO REST WITHIN 100 FT OF THE HOVERING HELI. WE WERE DOING STANDARD TFC PATTERNS; AND I WAS CTLING THE RADIO; MAKING EACH CALL AS WE TURNED TO THE APPROPRIATE LEG. THERE WERE THREE HELIS ON THE R SIDE (N) OF THE RWY. NOT ALL OF THEM WERE USING THE RWY TO PRACTICE LNDGS AND THE LAST CALL I HEARD WAS A HELI ON R DOWNWIND. I SAW NO TFC ON BASE OR FINAL. I ASSUME WITH THE NOSE HIGH PITCH; THAT THE HELI WAS HIGH AND TIGHT ON AN AUTOROTATION MANEUVER TO A VERY ACTIVE RWY. THERE WAS ALSO ONE OTHER PLANE IN THE L PATTERN; AND TWO HOLDING SHORT FOR DEP. AFTER THE NEAR MISS; WE TAXIED TO THE HANGAR TO INSPECT THE BRAKES AND NEWLY BALD R TIRE. THE HELI CONTINUED FLYING; STATING ON THE CTAF THEY WERE ON A CHKRIDE AND WOULD BE DOWN LATER IF ANYONE NEEDED TO TALK. WE TALKED AND HE APOLOGIZED STATING; 'WE NEVER SAW YOU.' WITH ALL THE TRAINING; STUDENTS; AND UNFAMILIAR PLTS; THESE R AND L CONVERGING PATTERNS POSE A DEADLY THREAT. THIS IS A HIGH TFC ARPT AND AN ACCIDENT IS INEVITABLE! HOPEFULLY; MY EXTREMELY UNNERVED STUDENT WILL CONTINUE TO FLY. LATER I WAS INFORMED THIS WAS A CFI CHKRIDE -- A PASSING CHKRIDE. I AM STILL TRYING TO UNDERSTAND A PASSING CHKRIDE BREAKING MULTIPLE FARS.