AN R22 HELI PLT DOES NOT CONFORM TO THE 'CRYSTAL 3' VISUAL DEP PROC WHEN DEPARTING THE RAMP AT SNA.

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ON THE DATE AND AT APPROX TIME AFOREMENTIONED AT SNA; I CALLED ATC FROM THE FBO ON THE E SIDE OF THE ARPT TO REQUEST A W DEP. THE ATC CTLR CONFIRMED THAT I WAS REQUESTING A 'CRYSTAL 3' DEP; AND I REPLIED IN THE AFFIRMATIVE. AT THIS POINT; I RECEIVED A CLRNC TO TAKE OFF FROM HELI PAD 3 FOR A 'CRYSTAL 3' DEP AND REPEATED THE CLRNC INSTRUCTIONS TO ATC. ON RECEIVING THIS CLRNC; I HOVERED ACROSS A TXWY TO HELI PAD 3 AND BEGAN MY TKOF CLB S. AT APPROX 300 FT AGL; I LOOKED TO MY R TO CONFIRM THAT THE RWYS WERE CLR (NO TFC); AND BEGAN A SLOW 90 DEG R TURN TO CROSS THE RWYS; OVERFLY THE TWR AND THE 'CRYSTAL COURT SHOPPING CTR' (HENCE THE NAME 'CRYSTAL' DEP). AT THIS POINT; I RECEIVED A CALL FROM THE TWR; REQUESTING MY DEST (SEAL BEACH) AND HOME ARPT (TORRANCE); AND WAS INSTRUCTED TO CALL THE TWR UPON MY ARR. I HAD NOT BEEN AWARE OF ANY VIOLATION OR OTHER PROB AS HAVING OCCURRED; BUT THERE WAS APPARENTLY SOME REASON TO CALL THE TWR. I CALLED THE TWR AT THE NUMBER INSTRUCTED AND LEFT A MESSAGE AS INSTRUCTED. I RETURNED TO SNA LATER REQUESTING AND RECEIVING CLRNC FOR A 'CRYSTAL 3' ARR. AFTER DROPPING OFF MY PAX AT THE FBO; I REQUESTED A 'CRYSTAL 3' DEP. ON THIS SECOND DEP; I WAS ASKED BY ATC WHETHER I WAS A 'SIGNATORY TO THE LETTER.' I REPLIED 'NEGATIVE; I DO NOT KNOW THE LETTER TO WHICH YOU ARE REFERRING.' ATC INSTRUCTED ME TO HOLD. A MIN OR SO LATER; I WAS CLRED TO TAKE OFF FROM HELI PAD 3; MAKE A L 270 DEG TURN; AND FLY OVER THE TWR AT 600(?) FT. I COMPLIED AND DEPARTED THE CLASS C AIRSPACE WITH NO PROB. I SUBSEQUENTLY ASKED 3 CFI'S FAMILIAR WITH THE AREA WHAT 'LETTER' ATC MIGHT HAVE BEEN REFERRING TO; BUT THEY DIDN'T KNOW. A FOURTH CFI I SPOKE WITH BELIEVED THAT THE 'LETTER' WAS A FORM OF ACKNOWLEDGEMENT OR UNDERSTANDING TO WHICH HELI PLTS FLYING IN AND OUT OF SNA SUBSCRIBED IN WHICH SPECIFIC PROCS WERE LAID OUT FOR ARRS AND DEPS; INCLUDING A CLBING L 270 DEG TURN FOR A 'CRYSTAL 3' DEP. THIS INFO CONFIRMED MY FEELINGS WHEN I RECEIVED THE SECOND DEP CLRNC FROM ATC THAT A CRYSTAL 3 DEP SPECIFICALLY CALLED FOR A L 270 DEG CLBING TURN. PRIOR TO THESE EVENTS; I HAD ONLY FLOWN TO AND FROM SNA ARPT ON 3 OTHER OCCASIONS. BEFORE FLYING TO SNA THIS TIME; I ASKED AND RECEIVED AN UPDATE FROM A CFI ON ARR PROCS AND WAS INFORMED TO REQUEST A 'CRYSTAL 3' ARR; FLY OVER THE CRYSTAL COURT SHOPPING CENTER; OVER THE TWR; CROSS THE RWYS; MAKE A 90 DEG R TURN; AND MAKE A STEEP APCH TO HELI PAD 3; WHICH I DID WITH CLRNC FROM ATC WITH NO PROB. ON 2 PREVIOUS DEPS; I MADE FROM HELI PAD 3 AT SNA; I SPECIFICALLY RECALL BEING INSTRUCTED TO MAKE 90 DEG R TURNS TO DEPART TO THE W. THEREFORE; WHEN ATC CONFIRMED MY REQUEST FOR A 'CRYSTAL 3' DEP ON MY FIRST DEP; I ASSUMED HE MEANT THE OPPOSITE OF MY ARR PROC; WHICH WAS TO MAKE A 90 DEG TURN TO CROSS THE RWYS. THIS SIT COULD HAVE BEEN AVOIDED IF I HAD CONFIRMED TO ATC MY UNDERSTANDING (OR LACK THEREOF) OF A CRYSTAL 3 DEP ON RECEIVING THE TKOF CLRNC; OR IF ATC HAD QUERIED ME ON MY FIRST DEP REQUEST AS ATC HAD DONE ON THE SECOND DEP. SOME ARPTS; SUCH AS SANTA MONICA; PUBLISH AND DISTRIBUTE SPECIFIC HELI ARR AND DEP INSTRUCTIONS ILLUSTRATED ON ARPT MAPS. I AM NOT AWARE THAT SNA DOES THIS; BUT IF THEY DO NOT; IT WOULD BE VERY HELPFUL IF THEY DID. I TRIED 3 MORE TIMES CALLING THE NUMBER GIVEN TO ME BY THE TWR; AND LEFT MESSAGES AS INSTRUCTED; HOWEVER; I HAVE RECEIVED NO RESPONSE FROM THESE CALLS.