C310 PLT LOSES COM DURING CRUISE.

Narrative

WHILE CRUISING ENRTE FROM BWI TO OXB ON AN IFR FLT PLAN; I NOTICED I HAD NOT HEARD FROM APCH IN A WHILE; AND IT WAS NEARING THE HDOF TO PATUXENT APCH. I CALLED LAST CTLR FOR SEVERAL MINS; THEN DECIDED CONTACT WITH HIM WAS LOST. I THEN PROCEEDED TO TRY ABOUT EVERY OTHER FREQ I COULD FIND FOR THE AREA; BOTH FROM THE CHART AND FROM SUGGESTIONS ON THE GARMIN 430 'NEAREST' PAGE. I FINALLY RAISED ZDC; BUT I WAS NOT IN THEIR AIRSPACE; SO I REQUESTED THAT THEY FORWARD TO PATUXENT OR POTOMAC APCH THAT I WAS CANCELING IFR. THEY SAID THEY WOULD TRY. AS I DSNDED INTO OXB; I BEGAN TO LOSE CONTACT WITH WASHINGTON AND COULD NOT GET A CLR ANSWER WHETHER OR NOT THEY WERE SUCCESSFUL CANCELING MY FLT PLAN; BUT I GOT THE IMPRESSION THAT THEY HAD CLOSED IT; OR WERE GOING TO KEEP TRYING. THE LANDLINE PHONES WERE OUT AT THE ARPT; AND I GOT DISTR; AND WAS FINALLY ABLE TO REACH FSS ON MY CELL ABOUT 1 1/2 HRS LATER; AND THEY ASSURED ME THE FLT PLAN WAS CANCELED. I ALSO CALLED PATUXENT APCH AND DISCUSSED THE ISSUES WITH THEM. I LATER FOUND OUT THAT THE FLT PLAN HAD NOT BEEN CANCELED BY WASHINGTON; AND PATUXENT APCH CALLED OXB TO CONFIRM MY ARR.