PCT CTLR ALERTS PC12 FO; ON IOE TRAINING FLT; OF COURSE AND ALTDEV AS THE FO INCORRECTLY UTILIZED AUTOFLT EQUIP ON APCH TO BWI.

Narrative

THIS FLT WAS THE FIRST IOE LINE TRAINING FLT FOR THE PF IN THE PILATUS PC-12. A DUTY DAY THAT STARTED AT XA00 FOR 14.5 HRS AT TIME OF EVENT COULD HAVE A BEARING. ATIS WAS RECEIVED INDICATING SIMULTANEOUS ILS APCHS FOR RWY 33 BWI. PF BRIEFED FOR AN EXPECTED ILS APCH TO RWY 33R. APCH CTL HAD US ON A N HDG UNTIL ALMOST ABEAM THE BWI ARPT. WE WERE THEN 'CLRED DIRECT TO THE ARPT; MAINTAIN 2000 FT.' ACFT WAS ON AUTOPLT; HDG AND ALT HOLD AT 2000 FT. TURNED HDG BUG TO 300 DEGS DIRECT TO ARPT. ON THIS HDG; I BEGAN SETTING UP FOR THE ILS APCH. IN THE PROCESS; AFTER TUNING THE ILS FREQ; I ENGAGED THE APCH MODE TO PREPARE FOR A LOC INTERCEPT. AFTER A MIN OR TWO; I REALIZED THAT I NEEDED TO HAVE THE INBOUND HDG SET AND PROCEEDED TO ROTATE THE COURSE SELECTOR TO THE INBOUND HDG. AT SOME POINT DURING THIS SETTING; THE APCH MODE CAPTURED AND TURNED THE ACFT TO APPROX 260 DEGS. UPON COMPLETING THE SETUP; IN XCHKING WITH THE MOVING MAP DISPLAY; I NOTICED A CONSIDERABLE DISPLACEMENT E OF THE LOC AND SELECTED HDG BUG TO TURN BACK TOWARDS THE ARPT. AT THIS POINT; MIND SET ON ILS; I STOPPED THE HDG BUG JUST SHORT OF THE OM (AS DISPLAYED ON THE MOVING MAP DISPLAY) FOR ABOUT A 1 MI INTERCEPT. SHORTLY THEREAFTER; WE RECEIVED A CALL FROM APCH ASKING OUR HDG. THE PNF ATTEMPTED TO REPLY. IMMEDIATELY UPON HIS RESPONSE; WE HEARD 'YOU ARE OFF COURSE TO THE L; WHAT ARE YOUR INTENTIONS?' I DISCONNECTED THE AUTOPLT AND INITIATED A TURN TO THE R AS THE PNF AGAIN ATTEMPTED CONTACT. SUSPECTING THE PNF WAS NOT SELECTED TO THE APCH COM; I KEYED MY MIKE AND ATTEMPTED A REPLY WITH NO RESPONSE. FOLLOWING THAT ATTEMPT THE XMISSION; 'I SEE YOU ARE NOW DSNDING; WHAT ARE YOUR INTENTIONS?' WE HAD; IN FACT; DSNDED TO 1700 FT. I TRIMMED FOR NOSE UP AND ARRESTED THE DSCNT; CLB SLIGHTLY. AT THIS POINT; WE HAD CLOSED TO A POINT HIGH ON THE GS AND I ASKED THE PNF TO CHANGE TO TWR AND SEE IF WE COULD GET THEM. TWR RESPONDED WITH A CLRNC TO LAND. FATIGUE; UNFAMILIARITY WITH CTL LOCATIONS; MINDSET ON DOING AN ILS IN SPITE OF THE VMC CAUSED THE PF TO MISINTERP THE CLRNC AND SUBSEQUENT DEV RESULTED.