PRIVATE PLT INADVERTENTLY PENETRATED TCA IN HIGHLY CONGESTED AREA AFTER CANCELING IFR AND VECTORS TO AN UNCTLED ARPT SANDWICHED IN AND BENEATH THE TCA.

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THE TRIP HAD BEEN MADE UNDER PREDOMINANTLY IMC; AND ARR INTO THE WASHINGTON AREA WAS AT APPROX 2000 LCL TIME. I WAS ON AN IFR FLT PLAN AND IN CONTACT WITH WASHINGTON APCH CTL WHO HAD GIVEN ME THE IRONS 2 APCH INTO W32 WITH VECTORS TO THE ARPT. I WAS AT APPROX 1500 MSL IN VFR CONDITIONS. HOWEVER; DUE TO THE HR (DUSK) AND ALT IT WAS DIFFICULT TO CLRLY AND PRECISELY IDENT THE LANDMARKS. NO ROTATING BEACONS OR RWY LIGHTING WAS ON AT ANY OF THE ARPTS IN THE AREA. WASHINGTON APCH GAVE ME A VECTOR TO W32 AND INDICATED MY DISTANCE (WHICH I DO NOT RECALL) FROM THE ARPT. AFTER A FEW MINS HAD PASSED; WASHINGTON APCH GAVE ME ANOTHER VECTOR (020) AND THE DISTANCE (3 MI) TO THE ARPT. I COMPARED THIS TO MY LORAN READOUT WHICH INDICATED THE SAME HDG (I DID NOT LOOK AT THE LORAN DISTANCE INDICATION). I COULD SEE A CLRING WHICH I BELIEVED TO BE W32 AND PROCEEDED DIRECTLY TO IT. WASHINGTON APCH ASKED WHETHER I WANTED TO CANCEL IFR. BELIEVING I HAD W32 IN SIGHT I CANCELLED IFR; RADAR SVC WAS TERMINATED AND I CHANGED THE TRANSPONDER TO VFR AND UNSUCCESSFULLY TRIED TO RAISE W32 UNICOM. I DID; HOWEVER; HEAR A HELI ANNOUNCE HIS INTENTION TO LAND ON 23 AT W32. AFTER APPROX 1 1/2 TO 2 MINS I COULD BEGIN TO MAKE OUT THE RWY (WHICH I THOUGHT WAS 5/23 AT W32); BUT I WAS NOT YET CLOSE ENOUGH TO SEE THE CLOSED RWY (13/31) AT THE NE END OF 5/23. I PROCEEDED FOR A L DOWNWIND ENTRY FOR RWY 23 FOR ANOTHER 1/2 TO 1 MIN LOOKING FOR THE CLOSED XING RWY AT THE FAR END OF THE ONE I HAD IN SIGHT IN ORDER TO POSITIVELY IDENT W32; BUT I WAS SENSING THAT I WAS NOT WHERE I WANTED TO BE. THE LORAN WAS INDICATING A HDG OF 020; WHICH I WAS HOLDING; AND A DISTANCE OF 6 MI TO W32. REALIZING NOW THAT I WAS APCHING ANDREWS AIR FORCE BASE AND THE WASHINGTON TCA; I EXECUTED A 180 DEG TURN; SWITCHED MY RADIO TO WASHINGTON APCH AND ASKED THEM FOR A VECTOR TO W32. WASHINGTON APCH ASKED ME TO 'IDENT;' BUT SAID THEY WERE UNABLE TO IDENT ME. THEY TOLD ME TO CONTACT ANDREWS RADAR. ANDREWS RADAR GAVE ME A VECTOR TO W32 AND ASKED ME IF I WAS AWARE THAT I HAD 'BUSTED' THE TCA. I TOLD THEM 'NEGATIVE' BELIEVING MY LORAN READOUT OF 6 MI TO W32 AT THE TIME I TURNED BACK TO HAVE BEEN CORRECT. ANDREWS RADAR ASKED ME TO COPY THE TELEPHONE NUMBER OF THE ANDREWS TWR AND TO CALL THEM AFTER I LANDED. I PROCEEDED TO W32 AND NOTED THE ROTATING BEACON AND RWY LIGHTS CAME ON AS I APCHED W32. I LANDED ON RWY 23. AFTER LNDG; I CALLED THE ANDREWS TWR WHO ASKED ME TO CALL THE SUPVR BACK IN 10-15 MINS. I CALLED THE SUPVR WHO INDICATED THAT I HAD ENTERED THE TCA AND OVERFLOWN THE FINAL APCH COURSE TO THEIR WESTERN PARALLEL RWY (WHAT I INITIALLY THOUGHT WAS 5/23 AT W32).