Narrative:

We were approaching the airport from the southwest (clt 052 degree inbound). Our VOR receivers have 2 heads with a toggle switch in between to change frequency. I had the VOR frequency on the left, the localizer frequency on the right. The front course for the approach is 053 degree. After our first vector for the approach I set in the course (only 1 degree change) and checked to see the correct frequency was set, however I forgot to throw the toggle switch. Approximately 10 mi from the runway, approach control asked if we showed ourselves on the localizer. That's when we discovered my mistake. I started a right turn to join the localizer and when I did I saw the runway slightly to the right (about 8-9 mi out). At this point we were still outside the final approach fix at 2300 AGL. The biggest contributing factor to this situation was fatigue. This happened on the last leg of a 4 day trip. The preceding overnight had been a min rest. My schedule before this trip was 2 days of ground school, 1 day off, another 4 day trip. Also the captain didn't identify the localizer signal for the approach. Again fatigue as his schedule was the same that month except for the ground school. There wasn't any traffic or terrain conflict, however, if it had been low IFR at a non radar facility, it might have been a far different ending.

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Original NASA ASRS Text

Title: ALERT TRACON APCH CTLR, WHILE RADAR MONITORING ARR TFC, ADVISES FLC OF HDG TRACK DEV ON A RADAR VECTOR TO AN IAP ILS.

Narrative: WE WERE APCHING THE ARPT FROM THE SW (CLT 052 DEG INBOUND). OUR VOR RECEIVERS HAVE 2 HEADS WITH A TOGGLE SWITCH IN BTWN TO CHANGE FREQ. I HAD THE VOR FREQ ON THE L, THE LOC FREQ ON THE R. THE FRONT COURSE FOR THE APCH IS 053 DEG. AFTER OUR FIRST VECTOR FOR THE APCH I SET IN THE COURSE (ONLY 1 DEG CHANGE) AND CHKED TO SEE THE CORRECT FREQ WAS SET, HOWEVER I FORGOT TO THROW THE TOGGLE SWITCH. APPROX 10 MI FROM THE RWY, APCH CTL ASKED IF WE SHOWED OURSELVES ON THE LOC. THAT'S WHEN WE DISCOVERED MY MISTAKE. I STARTED A R TURN TO JOIN THE LOC AND WHEN I DID I SAW THE RWY SLIGHTLY TO THE R (ABOUT 8-9 MI OUT). AT THIS POINT WE WERE STILL OUTSIDE THE FINAL APCH FIX AT 2300 AGL. THE BIGGEST CONTRIBUTING FACTOR TO THIS SITUATION WAS FATIGUE. THIS HAPPENED ON THE LAST LEG OF A 4 DAY TRIP. THE PRECEDING OVERNIGHT HAD BEEN A MIN REST. MY SCHEDULE BEFORE THIS TRIP WAS 2 DAYS OF GND SCHOOL, 1 DAY OFF, ANOTHER 4 DAY TRIP. ALSO THE CAPT DIDN'T IDENT THE LOC SIGNAL FOR THE APCH. AGAIN FATIGUE AS HIS SCHEDULE WAS THE SAME THAT MONTH EXCEPT FOR THE GND SCHOOL. THERE WASN'T ANY TFC OR TERRAIN CONFLICT, HOWEVER, IF IT HAD BEEN LOW IFR AT A NON RADAR FACILITY, IT MIGHT HAVE BEEN A FAR DIFFERENT ENDING.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.