CAPT OF A DHC-6 INADVERTENTLY ENTERED CLASS B ENHANCED AIRSPACE DURING DEPARTURE FROM AN UNCONTROLLED ARPT UNDERNEATH THE NORMAL CLASS B AIRSPACE AREA.

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AT APPROX XE15Z; I PLANNED TO DEPART LEESBURG ARPT (KJYO); VFR; AND PICK-UP MY IFR CLRNC TO JOHNSTON CO ARPT (KJNX). I CHECKED THE SECTIONAL AND DETERMINED THAT AFTER TKOF FROM RWY 17; REMAINING VFR; I WOULD DO A LEFT TURN-OUT REMAIN UNDER 1500 FT MSL AND CONTINUE NBOUND TO STAY OUT OF THE DULLES CLASS B AIRSPACE. UPON DEP AT APPROX XA30Z; I TURNED LEFT TO A HDG OF 000 DEGREES AND AT 1200 MSL; CONTACTED DULLES APCH TO PICK-UP MY IFR BACK TO KJNX. THE CTLR ASKED WHO GAVE ME CLRNC TO DEPART LEESBURG ARPT. I EXPLAINED WHAT I WAS DOING AND AS I WAS STILL IN THE DOWNWIND AT LEESBURG; I COULD RETURN FOR LNDG. THE CTLR GAVE ME A VECTOR FOR THE LEFT BASE TO RWY 17 AND TOLD ME TO CONTACT LEESBURG FSS FOR INSTRUCTIONS REGARDING OBTAINING A CLRNC TO DEPART LESSBURG IN CONSIDERATION OF THE CURRENT SPECIAL AIRSPACE RESTR IN PLACE IN AND AROUND THE WASHINGTON; DC; AREA. AFTER LNDG BACK AT KJYO; I CONTACTED FSS VIA TELEPHONE AND ASKED WHAT SPECIAL INSTRUCTIONS THERE WERE FOR DEPARTING KJYO. I WAS GIVEN A CLRNC FREQ TO TRY AND CONTACT DULLES AND A FREQ FOR A RADIO-CONTROLLED TELEPHONE IF I COULDN'T GET DULLES WITH THE PRIMARY FREQ. I CONTACTED DULLES FOR A CLRNC AND DEPARTED WITHOUT ANY FURTHER PROBS ENROUTE. EARLIER THAT AFTERNOON AND PRIOR TO MY FLT TO KJYO; I HAD CONTACTED FSS TO CHECK FOR NOTAMS AND SPECIAL PRECAUTIONS IN THE RDU AND KJYO AREAS. I WAS TOLD THAT I COULD PICK-UP MY CLRNC IN THE AIR. I ASKED THIS; AS PLTS HAD NOT BEEN ABLE TO LAST WEEK DUE TO THE EVENTS FROM THE TERRORISTS' ATTACKS. AFTER DEPARTURE FOR KJNX; I CONTACTED RALEIGH APCH AND PICKED UP MY CLRNC WHILE REMAINING VFR AND CONTINUED TO KJYO WITHOUT EVENT. I DID NOT UNDERSTAND; NOR WAS MADE AWARE BY FSS WHEN ASKED ABOUT NOTAMS IN THE AREA; THAT THE CLASS B AIRSPACE AT DULLES EXTENDED ALL THE WAY TO THE GROUND PAST LEESBURG ARPT DUE TO THE SPECIAL AIRSPACE SET-UP AFTER THE TERRORISTS' ATTACK IN THE WASHINGTON; DC; AREA.