AN ACR BA46 FLC DID NOT DO THE REQUIRED PROC TURN. THE WX WAS IMC AND THE ARTCC RADAR CTLR NOTED THE INCORRECT TURN; BUT DID NOT COMMENT UNTIL THE FLC WAS CANCELING THEIR IFR CLRNC.

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WE WERE CLRED FOR THE ILS RWY 18 APCH AT JAC VIA THE DNW TRANSITION. WE INTERPED THE PROC AS FOLLOWS: IDENT QUIRT WITH DNW AND JAC RADIALS; THEN INTERCEPT THE ILS INBOUND AT QUIRT IAF FOR THE APCH. WHEN WE CANCELED IFR ON THE GND; CTR ADVISED US THAT THE PROC TURN WAS REQUIRED. WHAT WE MISSED: DNW IS NOT AN IAF. THE TRANSITION HDG IS NOT WITHIN 30 DEGS OF THE INBOUND COURSE. 'NO PROC TURN' IS NOT LISTED. SUGGESTION FOR TERPS: ADD NOTE 'PROC TURN REQUIRED' ON ALL APCHS SO AFFECTED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS A FO ON AN ACR BAE146-200. HIS CAPT WAS FLYING THE APCH INTO JAC AND THEY DISCUSSED THE APCH; BUT BOTH PLTS MISSED THE REQUIREMENT TO PERFORM THE PROC TURN BECAUSE THEY ASSUMED THAT SINCE THEY WERE ALREADY AT 12000 FT THERE WAS NO NEED TO USE THE TURN TO LOSE ALT; HE SAID. THE WX WAS NOT VERY GOOD WITH LOW CEILINGS AND VISIBILITY SO THE CREW WAS CONCENTRATING ON MAKING A GOOD INTERCEPT OF THE COURSE AND GS. HE THOUGHT THAT THEY HAD DONE A GOOD JOB EVEN THOUGH THEY WERE A LITTLE HIGH ON GS INITIALLY. AFTER LNDG; WHEN THEY CALLED THE ARTCC CTLR TO CANCEL THEIR IFR CLRNC; SHE TOLD THEM THAT THEY SHOULD HAVE TURNED TO THE R AND PERFORMED THE PROC TURN. THIS WAS THEIR FIRST APCH INTO JAC. THE CREW WAS CONCERNED ABOUT THE PROC AND DISCUSSED DURING THEIR OVERNIGHT STAY. LATER THEY DISCUSSED THIS EVENT WITH THEIR CHIEF PLT AND SEVERAL INSTRUCTOR PLTS. THEIR COMPANY HAS PUBLISHED A BULLETIN ABOUT JAC EXPLAINING THIS REQUIREMENT AND OTHER ASPECTS OF FLYING INTO JAC.