Narrative:

The rfd ATIS information was received south of joliet, il. I was navigating direct to the rfd VOR, the ILS frequency 109.3 was loaded into the standby position on #1 navigation receiver, and the ADF frequency 275 was loaded into the ADF receiver active position. Shortly after being handed off to rfd approach, we were given a 270 degree heading, at which time I thought I loaded the ILS frequency into the active position of the #1 navigation receiver with the toggle switch, and in fact, did move the course deviation needle to the ILS course of 004 degrees on the pilot's HSI. We were experienced turbulence and there were scattered thunderstorms in the area. I believe that while moving the localizer frequency into the active position of the #1 navigation receiver with the VOR receiver toggle switch I may have inadvertently hit it twice, because of the rough air, which would have returned the rfd VOR frequency into the active location, and did not realize the error had taken place. I was then vectored south by rfd approach parallel to the ILS course, then turned back west, then northwest with approximately a 30 degree intercept angle to the localizer course. The deviation needle was left as it should be, no flag (the rfd VOR frequency, 110.8, was still tuned into the navigation active position), all indications on the HSI appeared normal. The ADF needle was selected onto the HSI and was being monitored for orientation with the ILS course. I realized a problem existed when the ADF needle passed through the ILS course west/O the localizer needle coming in, a course change correction was initiated, the problem was discovered and the localizer frequency was loaded into the active position, and approach control called out that we were through the localizer, all happening simultaneously. After correction was taken, the localizer was intercepted outside the marker beacon, and the balance of the approach took place normally. It is believed that the airplane did not leave the localizer zone during this incident. Upon receiving the localizer, I was showing a deviation of 1 1/2 DOT left to centerline of the localizer course on the pilot's HSI, with the deviation needle moving toward center.

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Original NASA ASRS Text

Title: GA SMA OVERSHOT LOC INTERCEPT DURING RADAR VECTORS FOR ILS APCH.

Narrative: THE RFD ATIS INFO WAS RECEIVED S OF JOLIET, IL. I WAS NAVIGATING DIRECT TO THE RFD VOR, THE ILS FREQ 109.3 WAS LOADED INTO THE STANDBY POS ON #1 NAV RECEIVER, AND THE ADF FREQ 275 WAS LOADED INTO THE ADF RECEIVER ACTIVE POS. SHORTLY AFTER BEING HANDED OFF TO RFD APCH, WE WERE GIVEN A 270 DEG HDG, AT WHICH TIME I THOUGHT I LOADED THE ILS FREQ INTO THE ACTIVE POS OF THE #1 NAV RECEIVER WITH THE TOGGLE SWITCH, AND IN FACT, DID MOVE THE COURSE DEVIATION NEEDLE TO THE ILS COURSE OF 004 DEGS ON THE PLT'S HSI. WE WERE EXPERIENCED TURB AND THERE WERE SCATTERED TSTMS IN THE AREA. I BELIEVE THAT WHILE MOVING THE LOC FREQ INTO THE ACTIVE POS OF THE #1 NAV RECEIVER WITH THE VOR RECEIVER TOGGLE SWITCH I MAY HAVE INADVERTENTLY HIT IT TWICE, BECAUSE OF THE ROUGH AIR, WHICH WOULD HAVE RETURNED THE RFD VOR FREQ INTO THE ACTIVE LOCATION, AND DID NOT REALIZE THE ERROR HAD TAKEN PLACE. I WAS THEN VECTORED S BY RFD APCH PARALLEL TO THE ILS COURSE, THEN TURNED BACK W, THEN NW WITH APPROX A 30 DEG INTERCEPT ANGLE TO THE LOC COURSE. THE DEVIATION NEEDLE WAS LEFT AS IT SHOULD BE, NO FLAG (THE RFD VOR FREQ, 110.8, WAS STILL TUNED INTO THE NAV ACTIVE POS), ALL INDICATIONS ON THE HSI APPEARED NORMAL. THE ADF NEEDLE WAS SELECTED ONTO THE HSI AND WAS BEING MONITORED FOR ORIENTATION WITH THE ILS COURSE. I REALIZED A PROB EXISTED WHEN THE ADF NEEDLE PASSED THROUGH THE ILS COURSE W/O THE LOC NEEDLE COMING IN, A COURSE CHANGE CORRECTION WAS INITIATED, THE PROB WAS DISCOVERED AND THE LOC FREQ WAS LOADED INTO THE ACTIVE POS, AND APCH CTL CALLED OUT THAT WE WERE THROUGH THE LOC, ALL HAPPENING SIMULTANEOUSLY. AFTER CORRECTION WAS TAKEN, THE LOC WAS INTERCEPTED OUTSIDE THE MARKER BEACON, AND THE BALANCE OF THE APCH TOOK PLACE NORMALLY. IT IS BELIEVED THAT THE AIRPLANE DID NOT LEAVE THE LOC ZONE DURING THIS INCIDENT. UPON RECEIVING THE LOC, I WAS SHOWING A DEVIATION OF 1 1/2 DOT LEFT TO CENTERLINE OF THE LOC COURSE ON THE PLT'S HSI, WITH THE DEVIATION NEEDLE MOVING TOWARD CENTER.

Data retrieved from NASA's ASRS site as of August 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.