C172 STUDENT AND INSTRUCTOR HAVE CLOSE ENCOUNTER WITH R22 TAKING OFF ACROSS THE RWY ON WHICH THEY HAD JUST TOUCHED DOWN. NEITHER ACFT ANNOUNCED ON CTAF.

Narrative

WHILE INSTRUCTING HIS STUDENT; THE CFI WAS LNDG IN A MODERATE XWIND; AND THE NORMAL RADIO CALL FROM BASE LEG WAS OMITTED BY BOTH CREWMEN. AFTER TOUCHDOWN; WHEN SPD WAS REDUCED SOMEWHAT; BOTH CFI AND STUDENT REALIZED A HELI WAS MAKING A TKOF RUN; WHICH WOULD INTERSECT THE LNDG RWY THEY WERE ON. THIS WAS THE ONLY RWY IN USE AT THE TIME FOR AIRPLANES. HELIS NORMALLY TAKE OFF AT THIS ARPT DIRECTLY ON THE PARALLEL TXWYS. AS THE HELI APCHED A COLLISION POINT; THE PLT MADE A HARD; CLBING; PEDAL TURN TO THE R AND RETURNED TO A POS FROM HIS STARTING POINT WELL OFF THE RWY AND TXWY. IT IS ESTIMATED THE CESSNA HAD BEEN (AT THAT TIME) TOO FAST TO STOP SHORT OF A COLLISION; AND TOO SLOW TO CROSS THE HELI'S PATH TO SAFETY BEFORE A COLLISION. ONLY THE HARD TURN-BACK BY THE HELI PLT AVERTED THE COLLISION. IT IS THOUGHT THAT THE HELI MADE NO RADIO CALL DURING HIS TKOF RUN AS WELL AS NONE FROM THE AIRPLANE. THESE ARE SPECULATIONS AS NO RECORDINGS WERE AVAILABLE. APPARENTLY; MORE JUDICIOUS USE OF THE COMS MIGHT HAVE AVOIDED THIS SITUATION ENTIRELY. SOMETIMES; WITH 2 CFI'S AND 2 STUDENTS IN CLOSE PROX; SUCH OMISSIONS DO OCCUR AND THIS APPARENTLY IS A CONTINUING SAFETY PROB. IT WAS GUSTY; A XWIND EXISTED; AND THE STUDENT IN THE AIRPLANE WAS NEEDING SOME DETAILED HELP ON HIS TECHNIQUE. THE CFI WAS VERY INVOLVED IN HIS DEMONSTRATION. THE HELI SITUATION IS OPEN TO SPECULATION.