ATX ROTARY WINGED TFC LANDS ON HELIPAD IN AN OFFSHORE OP IN CLOSE PROX TO A PARKED ATX HELI. AFTER TOUCHDOWN; THE 2 MAIN ROTOR BLADES MADE CONTACT. BOTH ACFT DAMAGED.

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I WAS ASKED TO FLY A MECH FROM AN OFFSHORE PLATFORM TO ANOTHER ONE TO FIX A GNDED ACFT. I WAS INFORMED BY TELEPHONE THAT THE PLT OF THE GNDED ACFT SAID THERE WAS PLENTY OF ROOM TO LAND. UPON ARR AT THE PLATFORM I OBSERVED THE GNDED ACFT PARKED MIDWAY BTWN THE UPWIND AND DOWNWIND SIDES OF THE HELIPAD ON THE SOUTHERN SIDE. THERE WAS A MAIN ROTOR TIE-DOWN ON ONE OF THE BLADES (4 BLADED ACFT) ON THE FRONT PLT'S SIDE. DUE TO THE POS OF THE PARKED ACFT'S MAIN ROTOR BLADES; THE PRESENCE OF A STAIRWELL NEAR WHERE MY TAILROTOR WOULD BE IF I LANDED SHORT; AND MY MECH'S NEED FOR ACCESS TO HIS TOOLBOX IN THE AFT BAGGAGE COMPARTMENT; I MADE MY APCH AND LNDG SO THAT MY MAIN ROTOR DISC WOULD BE IN THE VOID CREATED BTWN 2 OF THE OTHER ACFT'S STATIONARY BLADES. AFTER LNDG AND RETARDING THROTTLES TO FLT IDLE; I ADVISED THE MECH TO EXERCISE CAUTION IN GETTING OUT OF THE ACFT. AS HE STARTED TO LEAVE; THE FORWARD BLADE OF THE OTHER ACFT ROTATED INTO THE PLANE OF MY TURNING ROTORS; STRIKING 2 BLADES. I HAD VIOLATED COMPANY POLICY OF ALWAYS HAVING 13 FT OF BLADE CLRNC TO THE NEAREST FIXED OBSTRUCTION. UPON LNDG; THERE WAS 5 FT OF CLRNC. WHEN THE OTHER ACFT BLADE ROTATED; IT ELIMINATED THAT 5 FT. MY JUDGEMENT WAS POOR FOR DECIDING TO LAND WHEN THERE WAS OBVIOUSLY NOT 13 FT OF CLRNC. THE ONLY PRESSURE PUT ON ME WAS BY MYSELF FOR WANTING TO HELP GET A GNDED ACFT OPERATIONAL. HAD THE PLT OF THE OTHER ACFT PARKED FARTHER FORWARD; PUT ON MORE THAN 1 BLADE TIE-DOWN; OR APPLIED THE ROTOR BRAKE; THIS COULD HAVE BEEN AVOIDED ALTOGETHER; JUST AS IT COULD HAVE BEEN HAD I DECIDED NOT TO LAND.