A BELL HELI TEXTRON LOST ALL ELECTRICAL PWR AND ENTERED CLASS D AIRSPACE WITHOUT CLRNC.

Narrative

AFTER HDOF FROM JFK TWR TO BELOW AND E OF CLASS B AIRSPACE; WHILE VFR FROM HELIPAD TO FRG IN A BHT206-BII; WAS UNABLE TO CONTACT FRG TWR FOR CLRNC TO ENTER CLASS D AIRSPACE FOR LNDG AT HANGAR. IT APPEARED THAT THE GENERATOR DROPPED OFF LINE AND THE BATTERY PWR WAS TOO LOW TO SUPPORT MY XMISSIONS TO TWR FOR CLRNC TO ENTER CLASS D AIRSPACE. WHILE REMAINING SW OF CLASS D AND TRYING TO TROUBLESHOOT PROB; THE ANNUNCIATOR LIGHT INDICATING LOSS OF PWR TO FUEL PUMPS CAME ON. BEING UNABLE TO XMIT TO DECLARE MY EMER; AND BEING OVER A CONGESTED AREA; I DETERMINED THAT THE SAFEST COURSE OF ACTION WAS TO ENTER CLASS D WITHOUT CLRNC AND LAND AT HANGAR. THIS AREA IS IN THE SW CORNER OF THE ARPT; CLOSEST TO MY POS AND MY FLT PATH DID NOT INTERFERE WITH OTHER TFC. TWR WAS UNAWARE OF MY ARR UNTIL NOTIFIED BY ANOTHER ACFT THAT HAD HEARD PARTS OF MY XMISSIONS. AFTER LNDG; I WAS ABLE TO RESET THE GENERATOR SWITCH AND THE PROB DID NOT RECUR. I MIGHT HAVE BEEN ABLE TO AVOID THIS SIT IF I HAD NOTICED EARLIER THE LACK OF GENERATOR OUTPUT AND HAD MORE QUICKLY SHED ELECTRICAL LOAD.