CORP FLC ON ARR WITH 'EXPECT RADAR VECTORS' DEVIATES FROM THIS PROC AFTER PROGRAMMING FOR APCH INDICATED ON ATIS.

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THE CAPT HAD BRIEFED A VISUAL APCH TO RWY 36L WITH AN RNAV RWY 36L APCH BACKUP. HE HAD ENTERED THE RNAV APCH INTO OUR FMS AND COUPLED THE FMS TO THE AUTOPLT WHICH WAS FLYING THE ACFT. WHEN WE CROSSED THE LEESE FIX THE AUTOPLT TURNED R AND HEADED FOR THE 'CAMBE' INTXN WHICH WAS THE INITIAL APCH FIX FOR THE RNAV RWY 36L APCH. THE COPLT; ME; WAS OFF FREQ AND ENGAGED IN A RADIO CONVERSATION; NOT MONITORING THE CAPT. THE FMS; COUPLED TO THE AUTOPLT IN THE NAV MODE; WAS DOING EXACTLY AS THE CAPT HAD PROGRAMMED IT; SO HE DID NOT SUSPECT A PROB. RECOMMENDED ACTION: HAVE ALL ARRS END WHERE 'EXPECT VECTORS TO FINAL APCH COURSE' BEGINS. I HAVE INCLUDED THE LEESE 8 ARR TO THE ORLANDO EXECUTIVE ARPT. IT IS THE SAME AS THE ARR TO ORLANDO INTL. I HAVE ALSO INCLUDED THE BUCKS ARR INTO PHILADELPHIA INTL AS AN EXAMPLE OF A RECOMMENDED FIX FOR THIS PROB. ON THE BUCKS ARR THERE IS NO ADDITIONAL FIX TO FLY TO AFTER BUCKS; THEREFORE THE CTLR MUST ISSUE A HDG BEFORE ACFT PROCEED PAST BUCKS. IF ALL ARRS WERE CONSTRUCTED AS THE BUCKS ARR THE CHANCES OF THIS HAPPENING AGAIN WOULD BE DIMINISHED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE WAS AN ATC RADAR CTLR FOR OVER 10 YRS AND HE KNEW WHEN THE CTLR CAME ON FREQ AND ASKED 'WHAT IS YOUR HDG?' THAT SOMETHING WAS WRONG. HE INITIALLY CHKED THE TCASII AND NOTED NO TFC. CTLR ASKED WHERE DID YOU GET THAT HDG? RPTR WAS GIVEN THE APCH TO EXPECT FROM ATIS AND THAT IS WHAT HAD BEEN PROGRAMMED. RPTR REALIZES THAT THE CTLR HAD EXPECTED THEM TO CONTINUE ON TO THE VOR AS SHOWN ON THE ARR CHART. HE HAS HAD THE FEELING FOR OVER 25 YRS THAT THERE SHOULD BE NO WAY TO CONTINUE BEYOND THE LAST FIX WHEN AN ARR SAYS 'EXPECT VECTORS ON FINAL APCH COURSE AFTER XXXXX INTXN.' THEN THE CTLR MUST GIVE VECTORS AND WOULD AVOID THIS KIND OF PROB. RPTR WILL FAX A COPY OF THE RNAV RWY 36L APCH SINCE IT IS NOT A NORMALLY PUBLISHED APCH.