AIR TAXI ACFT MISINTERPRETS CLRNC; MISSES XING ALT RESTRICTION.

Narrative

I WAS ENRTE FROM MONTREAL; CANADA; TO HARRISBURG; PA. WE WERE N OF THE ROCKDALE VOR WHEN CTR CLRED US DIRECT TO HARRISBURG. I READ BACK THE CLRNC DIRECT TO THE HARRISBURG VOR DIRECT TO THE ARPT SINCE WE WERE NEGATIVE RNAV. THE CTLR CORRECTED ME THAT WE WERE CLRED DIRECT TO THE ARPT. I ADVISED THE CTLR THAT WE WERE NEGATIVE RNAV AND WOULD REQUIRE A VECTOR. THE CTLR THEN ASSIGNED A HDG OF 215 DEG FOR THE ARPT. APPROX 10 MINS LATER WE WERE ISSUED A CLRNC TO CROSS 15 NM N OF HARRISBURG AT 9000 FT. I ACKNOWLEDGED THE CLRNC. THIS IS WHERE THE PROB AROSE. I THOUGHT THAT THE CLRNC WAS TO CROSS 15 NM N OF THE HARRISBURG VOR SINCE WE WERE NOT RNAV EQUIPPED AND HAD NO WAY TO IDENT A FIX 15 N OF THE ARPT. SHORTLY AFTER WE BEGAN OUR DSCNT; A COUPLE OF MINS LATER; WE WERE ISSUED A HDG FOR TFC. AFTER DSNDING THROUGH APPROX FL250 WE WERE CLRED DIRECT HARRISBURG. THERE WAS A LITTLE FREQ CONGESTION SO WE STARTED OUR TURN TOWARDS THE ARPT INTENDING TO OBTAIN A NEW VECTOR AS SOON AS THE FREQ WAS CLR. HOWEVER; DUE TO COCKPIT WORKLOAD (APCH CHKLIST) WE FAILED TO OBTAIN A VECTOR FROM ATC FOR DIRECT TO THE ARPT. THE PROB WAS DISCOVERED WHEN ATC REQUESTED OUR ALT AND I BELIEVE I RESPONDED DSNDING THROUGH 14000 OR 15000 FT. I DIDN'T BELIEVE THERE WAS A PROB BECAUSE WE WERE STILL 30 NM N OF THE VOR. ATC ADVISED US THAT WE WERE NOW 17 N OF THE ARPT AND FAILED TO MEET OUR RESTRICTION. AT THIS POINT; WE DEPLOYED OUR SPOILERS TO INCREASE OUR DSCNT AND WERE LEVEL AT 9000 IN ABOUT 1 1/2 MINS. BEFORE I COULD ADVISE CTR THAT I THOUGHT OUR RESTRICTION WAS THE VOR; OUR SECOND PROB WAS DISCOVERED; THAT WE WERE OFF COURSE. ATC THEN ADVISED HOW WE WERE NAVING. I INFORMED HIM OF OUR HDG. ATC ASKED US IF WE WERE RNAV EQUIPPED. I RESPONDED NEGATIVE. ATC THEN ASKED HOW COME WE ACCEPTED THE CLRNC WHEN WE WERE NOT RNAV EQUIPPED. I MADE AN ATTEMPT TO EXPLAIN HOW WE WERE NAVING. ATC THEN GAVE US A HDG FOR THE ARPT. I RESPONDED THAT WE HAD THE ARPT IN SIGHT AND HE HANDED US OFF TO HARRISBURG APCH. WE CONTACTED APCH AND EXECUTED A VISUAL APCH TO THE ARPT. I BELIEVE THAT A CONTRIBUTING FACTOR AFFECTING MY PERFORMANCE MAY HAVE BEEN FATIGUE. THIS; I BELIEVE IS WHY I PERCEIVED THAT THE CTLR WAS USING THE VOR FOR THE XING RESTRICTION AND NOT THE ARPT; AND ALSO FAILING TO REQUEST A NEW VECTOR FOR THE ARPT. THE FIRST PROB COULD HAVE BEEN CORRECTED BY EITHER THE CTLR WHEN ISSUING OR MYSELF WHEN READING BACK THE CLRNC BEING SPECIFIC ON STATING THAT THE RESTRICTION WAS FROM THE ARPT NOT THE VOR; SINCE THEY BOTH HAVE THE SAME NAME. THE SECOND PROB WAS IMPROPER TECHNIQUE ON MY PART. I SHOULD HAVE WAITED UNTIL THE FREQ WAS CLR TO OBTAIN A VECTOR INSTEAD OF TURNING AND THEN TRYING TO OBTAIN A VECTOR. THEREFORE; I WOULDN'T HAVE BEEN DISTRACTED BY THE APCH CHKLIST.