A B757 PLT FLEW R SEAT (PNF) OF A BE35 WHILE THE OWNER FLEW FROM THE L SEAT (PF).

Narrative

ON JUL/XA/01 I WAS ACTING AS PIC OF A SINGLE ENG BEECHCRAFT BONANZA ACFT ON AN IFR FLT PLAN FROM FWA TO BCB. THIS ACFT IS OWNED BY A FRIEND OF MINE WHO WAS DOING THE ACTUAL FLYING ON THIS FLT. HE IS AN INST RATED PLT WITH MINIMAL EXPERIENCE AND WAS NOT INST CURRENT. I WAS OCCUPYING THE R EAT AND PERFORMING THE NAV AND COMS DUTIES. THE WX AT BCB WAS SUCH THAT AN INST APCH WAS REQUIRED. ROA APCH CTL HAS RESPONSIBILITY FOR THE AIRSPACE AT BCB. THEY ADVISED THAT WE COULD EXPECT THE LOC DME APCH TO RWY 12 AT BCB. WE WERE THEN CLRED TO HOLD OVER THE ROA VOR TO AWAIT OUR TURN FOR THE APCH. THE LOC DME RWY 12 APCH AT BCB HAS A TRANSITION FROM THE ROA VOR AND WHEN WE WERE ISSUED OUR APCH CLRNC WE WERE ASSIGNED THIS TRANSITION. THIS CAUGHT ME A LITTLE FLAT FOOTED AS I HAD EXPECTED TO RECEIVE RADAR VECTORS TO INTERCEPT THE LOC. I QUICKLY SET ABOUT CONFIGURING THE NAV INSTRUMENTATION FOR THE APCH; BUT IN DOING SO I MISREAD THE COMMERCIAL APCH CHART. THE TRANSITION CALLED FOR FLYING THE 268 DEG RADIAL FOR 26.8 NM TO THE PATDA INTXN; WHICH IS THE IAF FOR THE LOC DME RWY 12. PATDA IS ALSO 12.2 DME ON THE LOC DME RWY 12. AS WE WERE FLYING THE TRANSITION OUTBOUND ON THE 268 DEG RADIAL FROM THE ROA VOR; I USED THE 12.2 DME REF FOR THE LOCATION OF PATDA INSTEAD OF THE 26.8 DME I SHOULD HAVE BEEN USING. THUS AT 12.2 DME FROM THE ROA VOR WE BEGAN OUR R TURN TO INTERCEPT THE LOC COURSE INBOUND. IN FACT; WE WERE STILL 14.6 MI FROM PATDA. I SUSPECTED SOMETHING WAS AMISS AND FINALLY DISCOVERED MY MISTAKE AFTER WE HAD COMPLETED APPROX 135 DEGS OF TURN. WE IMMEDIATELY REVERSED OUR TURN AND REINTERCEPTED THE 268 DEG RADIAL OUTBOUND TO PATDA. THE REMAINDER OF THE APCH WAS FLOWN NORMALLY. TO MY KNOWLEDGE THERE WAS NO CONFLICT CAUSED BY OUR DEV. I AM A CURRENT AIRLINE CAPT FLYING THE B757 ACFT. THE REALITY IS THAT FLYING LIGHT ACFT UNDER IFR CONDITIONS IS OFTEN MORE DEMANDING THAN FLYING HVY JETS. SOMETHING WE TEND TO TAKE FOR GRANTED. THE VAT MAJORITY OF ALL INST APCHS FLOWN BY LARGE TURBOJET ACFT ARE ILS OR LOC APCHS PRECEDED BY RADAR VECTORS TO INTERCEPT. IT IS EASY TO LOSE PROFICIENCY WITH OTHER TYPES OF APCHS. BECAUSE OF THE SHORT TIME I HAD TO CONFIGURE FOR THE APCH; I WAS IN TOO BIG OF A HURRY AND MADE THE SIMPLE MISTAKE OF READING A CHART INCORRECTLY. IN A 2 CREW MEMBER ENVIRONMENT; THIS MISTAKE LIKELY WOULD HAVE BEEN CAUGHT BY THE OTHER CREW MEMBER.