Narrative:

I was being vectored for an ILS runway 17L at aus. The autoplt was used during the cruise and descent portion of the flight. I disconnected the autoplt just prior to localizer intercept. At that time the airplane made an uncontrolled turn to the right. I now found myself using almost 45 degrees of yoke travel to the left to hold the wings level. I should have gone missed approach at this time; but I did try to salvage the approach which was a mistake on my part. After finally making the decision to go missed; I believe there were several heading deviations and altdevs before I had the airplane completely under control. I then xferred fuel from the right wing to the left wing. This seemed to correct the problem. I then went to my alternate. As part of the descent and landing checklist is an item to check fuel quantity and balance. According to the gauges there was less than a 300 pound imbal (well within the 500 pound limit). We are now waiting for the maintenance shop to check the accuracy of the fuel gauges. Although I have several hundred hours in this make and model airplane; I only have approximately 6 hours in this airplane. Callback conversation with reporter revealed the following information: the reporter stated that the aircraft is undergoing an avionics upgrade; and will also undergo a thorough weight and balance assessment. Fuel gauges will also be calibrated at that time. At this stage; inaccurate fuel gauges are suspected.

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Original NASA ASRS Text

Title: SA226 MADE UNCOMMANDED ROLL WHEN AUTOPILOT WAS DISENGAGED. CONTROL WAS REGAINED; AND FLT PROCEEDED TO THE ALT.

Narrative: I WAS BEING VECTORED FOR AN ILS RWY 17L AT AUS. THE AUTOPLT WAS USED DURING THE CRUISE AND DSCNT PORTION OF THE FLT. I DISCONNECTED THE AUTOPLT JUST PRIOR TO LOC INTERCEPT. AT THAT TIME THE AIRPLANE MADE AN UNCTLED TURN TO THE R. I NOW FOUND MYSELF USING ALMOST 45 DEGS OF YOKE TRAVEL TO THE L TO HOLD THE WINGS LEVEL. I SHOULD HAVE GONE MISSED APCH AT THIS TIME; BUT I DID TRY TO SALVAGE THE APCH WHICH WAS A MISTAKE ON MY PART. AFTER FINALLY MAKING THE DECISION TO GO MISSED; I BELIEVE THERE WERE SEVERAL HDG DEVS AND ALTDEVS BEFORE I HAD THE AIRPLANE COMPLETELY UNDER CTL. I THEN XFERRED FUEL FROM THE R WING TO THE L WING. THIS SEEMED TO CORRECT THE PROB. I THEN WENT TO MY ALTERNATE. AS PART OF THE DSCNT AND LNDG CHKLIST IS AN ITEM TO CHK FUEL QUANTITY AND BAL. ACCORDING TO THE GAUGES THERE WAS LESS THAN A 300 LB IMBAL (WELL WITHIN THE 500 LB LIMIT). WE ARE NOW WAITING FOR THE MAINT SHOP TO CHK THE ACCURACY OF THE FUEL GAUGES. ALTHOUGH I HAVE SEVERAL HUNDRED HRS IN THIS MAKE AND MODEL AIRPLANE; I ONLY HAVE APPROX 6 HRS IN THIS AIRPLANE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER STATED THAT THE ACFT IS UNDERGOING AN AVIONICS UPGRADE; AND WILL ALSO UNDERGO A THOROUGH WT AND BAL ASSESSMENT. FUEL GAUGES WILL ALSO BE CALIBRATED AT THAT TIME. AT THIS STAGE; INACCURATE FUEL GAUGES ARE SUSPECTED.

Data retrieved from NASA's ASRS site as of May 2009 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.