CPR HELI LNDG JRA HAS TO HOVER AT 50 FT TO ALLOW ANOTHER HELI TO LAND. UNEVENTFUL LNDG. ON SUBSEQUENT RETURN FLT ADVISED DOWNWASH HAD CAUSED THE ROTOR BLADE OF SK76 TO STRIKE THE GND. ACFT WAS INSPECTED AND FLOWN TO MAINT BASE FOR FURTHER INSPECTION.

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I MADE MY APCH TO JRA. I WAS ASSIGNED LNDG/PARKING SPOT AA BY THE HELI OPERATOR. THERE WAS AN SK76 PARKED AND SHUT DOWN ON SPOT BB; ADDITIONALLY ANOTHER SK76 HAD JUST LANDED AND WAS RUNNING ON SPOT CC. MY APCH HDG WAS 060 DEGS. I TERMINATED MY APCH TO A HIGH HOVER BTWN SPOTS DD AND AA. THEN I MADE A L PEDDLE TURN TO FACE THE HUDSON RIVER AND PROCEEDED TO LAND ON SPOT AA. AFTER REMAINING ON SPOT AA FOR APPROX 8 MINS; WE DEPARTED JRA. APPROX 30 MINS LATER WE RETURNED TO JRA. AT THIS TIME I WAS THE PNF. THE HELI OPERATOR NOTIFIED US THAT ON OUR PREVIOUS APCH AND LNDG WE HAD CAUSED ONE OF THE MAIN ROTOR BLADES OF THE SK76 PARKED ON SPOT BB TO FLEX AND CONTACT THE GND. I FEEL THAT THE WIND DIRECTION AND SPD INCREASED OUR ROTOR WASH AND MAY HAVE CONTRIBUTED TO THIS INCIDENT; AS WELL AS THE CLOSE PROX OF THE PARKING SPOTS. A REPRESENTATIVE FROM THE MANUFACTURER INSPECTED THE BLADE AND SPINDLE FOR DAMAGE. THERE WAS NOT ANY DAMAGE FOUND DURING THIS INSPECTION; EXCEPT A SMALL SCUFF MARK ON THE ROTOR BLADE TIP CAP. THE ACFT WAS RELEASED FOR FLT. ALL OF THE HELIPORTS IN THE NY CITY AREA ARE CONFINED AREAS WITH NUMEROUS APCHS AND LNDGS BEING MADE SIMILAR TO THIS APCH AND LNDG. THIS WAS A ROUTINE OP IN THE NY CITY AREA. CREW COORD WAS CONDUCTED DURING THE OP WITH THE PNF OBSERVING THE PARKED SK76 DURING THE APCH AND PEDDLE TURN. ONE ACTION TO CORRECT THIS PROB COULD BE THE REMARKING OF THE HELIPORTS USING ONE LESS PARKING SPOT. THIS WILL ALLOW MORE SPACE BTWN ACFT; ALONG WITH REDUCED ROTOR WASH WIND SPDS THAT COULD AFFECT PARKED ACFT. THIS WAS THE SECOND INCIDENT OF THIS TYPE AT JRA. UNTIL THIS INCIDENT; WE WERE UNAWARE OF SK76 ROTOR BLADES BEING ABLE TO FLEX AND CONTACT THE GND WITH THE DROOP STOPS IN PLACE.