A PA31-350 FLC ENTERS FRG ATA CLASS D WITHOUT CALLING THEM FIRST. THEY WERE VFR AND WERE CLRED OFF OF N90 TRACON FREQ; RADAR SVC TERMINATED; AT 6 MI FROM FRG.

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WE WERE ON A VFR FLT EBOUND THROUGH THE NEW YORK CLASS B AIRSPACE ENRTE TO FRG; FARMINGDALE; NY. WE WERE RECEIVING ADVISORIES FROM NY APCH. I WAS PNF AND HANDLING RADIO COMS. NY APCH TERMINATED RADAR ABOUT 6 MI FROM THE ARPT; WHILE WE WERE STILL IN CLASS B. WE WERE INSTRUCTED TO SQUAWK 1200; AND CHANGE FREQS. I HAD BEEN ANTICIPATING A HDOF TO THE TWR. WE WERE DSNDING FROM 3000 FT AND FLYING AT 180 KTS. BY THE TIME I CONTACTED FRG TWR; WE WERE INSIDE THE CLASS D. AS WE CLRED THE RWY; TWR MENTIONED THIS AND TOLD US OF SOME LCL LANDMARKS THAT DEFINED THE CLASS D. THIS PROB AROSE BECAUSE OF THE UNEXPECTED NEED TO CONTACT TWR ON OUR OWN; CHANGE XPONDER CODE; AND PERFORM PRE-LNDG CHKS. THE AIRSPACE IS VERY TIGHT IN THIS AREA OF NY; AND IT CAN BE DIFFICULT TO EXIT ONE AIRSPACE AND THEN RE-ESTABLISH CONTACT WITH THE NEXT IN A MATTER OF A COUPLE OF MI. IT WOULD BE HELPFUL IF ATC WOULD WORK OUT HDOFS IN THIS CASE; OR ADVISE THE PLT AHEAD OF TIME THAT A HDOF WILL NOT BE POSSIBLE. IN A FAST AIRPLANE; IT CAN BE DIFFICULT TO AVOID AIRSPACE IN A COUPLE OF MI; EVEN IF A 90 DEG TURN IS MADE; AS WOULD HAVE BEEN THE CASE WITH US.