Narrative:

On approach into ZZZ upon selection of flaps 45 degrees for landing, aircraft began to roll to the left. I used 1 full unit of right aileron trim, and right aileron to stabilize aircraft. We had light to moderate rime ice on aircraft which we immediately began to accumulate at the tops of the overcast at 5000 ft AGL. The wing and cowl anti-ice were previously selected and indications were normal. The winds were from 220 degrees at 20 KTS and gusting. Aircraft was landed safely. There were no abnormal caution messages and the flight control synoptic page indications were normal during the event. We had received the aircraft from maintenance with the same problem from a previous crew. Maintenance performed an inspection of the flaps and operated flaps with no discrepancies noted. We were made aware of previous problem with the aircraft from reading the previous write-up in maintenance logbook. With this in mind, I briefed the first officer that I would turn the autoplt off before selection of flaps 45 degrees on approach. We executed a normal approach with the proper flap schedule and broke out of the overcast at 900 ft gal. I called for flaps 45 degrees with the autoplt off and immediately corrected the left rolling tendency of the aircraft as previously noted. Callback conversation with reporter revealed the following information: the reporter stated maintenance corrected the uncommanded roll at flaps 45 degrees with the rigging of the ailerons. The reporter said the airplane was returned to service with no further reports.

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Original NASA ASRS Text

Title: A CANADAIR CL65 ON APCH AT 900 FT UPON SELECTION OF 45 DEGS FLAPS ACFT BEGAN AN UNCOMMANDED ROLL TO THE L. SECOND RPT.

Narrative: ON APCH INTO ZZZ UPON SELECTION OF FLAPS 45 DEGS FOR LNDG, ACFT BEGAN TO ROLL TO THE L. I USED 1 FULL UNIT OF R AILERON TRIM, AND R AILERON TO STABILIZE ACFT. WE HAD LIGHT TO MODERATE RIME ICE ON ACFT WHICH WE IMMEDIATELY BEGAN TO ACCUMULATE AT THE TOPS OF THE OVCST AT 5000 FT AGL. THE WING AND COWL ANTI-ICE WERE PREVIOUSLY SELECTED AND INDICATIONS WERE NORMAL. THE WINDS WERE FROM 220 DEGS AT 20 KTS AND GUSTING. ACFT WAS LANDED SAFELY. THERE WERE NO ABNORMAL CAUTION MESSAGES AND THE FLT CTL SYNOPTIC PAGE INDICATIONS WERE NORMAL DURING THE EVENT. WE HAD RECEIVED THE ACFT FROM MAINT WITH THE SAME PROB FROM A PREVIOUS CREW. MAINT PERFORMED AN INSPECTION OF THE FLAPS AND OPERATED FLAPS WITH NO DISCREPANCIES NOTED. WE WERE MADE AWARE OF PREVIOUS PROB WITH THE ACFT FROM READING THE PREVIOUS WRITE-UP IN MAINT LOGBOOK. WITH THIS IN MIND, I BRIEFED THE FO THAT I WOULD TURN THE AUTOPLT OFF BEFORE SELECTION OF FLAPS 45 DEGS ON APCH. WE EXECUTED A NORMAL APCH WITH THE PROPER FLAP SCHEDULE AND BROKE OUT OF THE OVCST AT 900 FT GAL. I CALLED FOR FLAPS 45 DEGS WITH THE AUTOPLT OFF AND IMMEDIATELY CORRECTED THE L ROLLING TENDENCY OF THE ACFT AS PREVIOUSLY NOTED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED MAINT CORRECTED THE UNCOMMANDED ROLL AT FLAPS 45 DEGS WITH THE RIGGING OF THE AILERONS. THE RPTR SAID THE AIRPLANE WAS RETURNED TO SVC WITH NO FURTHER RPTS.

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.