JFK LCL CTLR CONCERNED WITH CONTINUOUS SID ALT CHANGE OF KENNEDY DEP FROM ITS PUBLISHED ALT OF 3000 FT TO 2000 FT TO ALL ACFT ASSIGNED THE IDLEWILD CLB.

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ON THE KENNEDY 9 DEP PROC; THE IDLEWILD CLB INITIAL ALT WAS CHANGED FROM 2000 FT TO 3000 FT. FOR YRS; KENNEDY TWR HAS USED; AND CONTINUES TO USE; 2000 FT AS THE INITIAL ALT TO MEET AIRSPACE RESTRS AND TO AVOID A LOSS OF SEPARATION. PLTS CONTINUE TO BE ISSUED 2000 FT AS THE INITIAL ALT IN THEIR IFR CLRNC; AND RIGHTLY SO. HOWEVER; AS THE PLT REVIEWS THE DEP PROC; HE OR SHE SEES 3000 FT PUBLISHED; WHICH MAY LEAD THE PLT TO INADVERTENTLY USE 3000 FT INSTEAD OF THE 2000 FT ISSUED; IN WHICH CASE THERE IS THE RISK OF A CONFLICT WITH NEARBY ACFT; INCLUDING OVERFLTS. THIS SIT MAY CAUSE OR CONTRIBUTE TO ACCIDENTS OR INCIDENTS. SINCE 3000 FT IS NOT USED AS AN INITIAL ALT; AND ITS USE COULD VIOLATE AIRSPACE RESTRS AND CAUSE A LOSS OF SEPARATION BTWN ACFT; CORRECTIVE ACTION MUST BE TAKEN TO RETURN THE PUBLISHED IDLEWILD CLB ALT TO 2000 FT. CALLBACK CONVERSATION WITH JFK SPECIALIST REVEALED THE FOLLOWING INFO: PAPERWORK HAD ALREADY BEEN EFFECTED THROUGH FAA CHANNELS AND THE KENNEDY SID ALT CHANGE FROM 3000 FT TO 2000 FT WOULD BECOME EFFECTIVE AT THE NEXT AVAILABLE PUB CHARTING DATE.