BE90 PLT ENTERED DC ADIZ WITHOUT AN ATC CLRNC. 2 FLT PLANS APPEARED; CAUSING CONFUSION IN PICKING UP THE IFR CLRNC. THE PLT HAD A XPONDER CODE AND WAS TALKING TO PCT WHEN THE INCURSION OCCURRED.

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ACFT DEPARTED PHF ON A VFR/IFR FLT TO ATW; WI. STOPS WERE PLANNED FOR OFP AND 2W6 TO PICK UP PAX. FDY WAS THE PLANNED STOP FOR REFUELING. THE LEGS TO OFP AND 2W6 WERE CONDUCTED AS VFR FLTS WITH FLT FOLLOWING. THE FLT FROM 2W6 TO FDY WAS A PLANNED IFR FLT VIA MGW; GPS DIRECT. A FLT PLAN HAD BEEN FILED WITH DUATS THE NIGHT BEFORE. ON THE LEG FROM OFP TO 2W6; POTOMAC APCH HANDED THE FLT OFF TO PATUXENT APCH. A REQUEST WAS THEN MADE FOR THE IFR OUTBOUND CLRNC APPROX 20 MI OUT THE CTLR ADVISED HE DID NOT HAVE A FLT PLAN ON FILE. THE CTLR WAS THEN REQUESTED TO TAKE A FLT PLAN; BUT WAS UNABLE TO ACCOMMODATE THE REQUEST. ONCE 2W6 WAS RPTED IN SIGHT; THE CTLR TERMINATED RADAR SVCS. FLT LANDED; PICKED UP 1 PAX AND DEPARTED VFR ON A HDG DIRECT MGW. DURING THE PLANNED CLB TO 16000 FT; SEVERAL ATTEMPTS WERE MADE TO CONTACT LEESBURG RADIO ON 122.30 WITH NO SUCCESS. FLT WATCH WAS THEN CONTACTED AND ADVISED LISTENING ON THE BRV VOR AND XMITTING ON 121.10. CONTACT WAS THEN MADE WITH LEESBURG FSS. AN IFR FLT PLAN TO FDY WAS FILED. THE SPECIALIST ADVISED POTOMAC SHOULD HAVE THE FLT PLAN AND TO CONTACT POTOMAC APCH. POTOMAC APCH WAS THEN CONTACTED ON 134.90 AND IFR CLRNC WAS REQUESTED. THE CTLR VERIFIED THE TAIL NUMBER AND THEN STATED HE HAD 2 FLT PLANS FOR US FROM 2W6 TO FDY. HE THEN ISSUED A XPONDER CODE WHILE HE 'SORTED OUT' THE FLT PLANS. AT THIS TIME; THE GPS TRACK INDICATED THE FLT WOULD TRANSITION THE WASHINGTON CLASS B AIRSPACE N APPROX 9 MI. A SOUTHERLY TURN TO 290 DEGS WAS MADE TO AVOID THE CLASS B AIRSPACE. IN A FEW MOMENTS; THE CTLR CAME BACK AND ADVISED FREQ CHANGE AND THAT THE NEXT CTLR WOULD ISSUE THE IFR CLRNC. AT NO TIME DID THE CTLR ADVISE THE FLT IT HAD ENTERED THE WASHINGTON ADIZ. AFTER CONTACTING THE NEXT CTLR; AN ACFT POS RPT WAS REQUESTED AND RPTED AS 10 MI SSW OF LAPLATTA. THE CTLR RADAR IDENTED US AND RPTED THAT WE HAD VIOLATED THE ADIZ BY 8 MI. HE SAID HE HAD TO CHK WITH THE AIR DEFENSE SECTION TO DETERMINE THEIR DESIRES IN THE MATTER. HE ADVISED ME TO CALL UPON LNDG IN FINDLEY. A HDG OF 360 DEGS WAS ASSIGNED AND A CLB TO 14000 FT WAS ASSIGNED. THE FLT TO FDY WAS COMPLETED WITHOUT INCIDENT.