MD80 flight crew has jammed aileron trim during approach to okc.

Attributes
ACN	589635
Time
Date	200308
Day	Sat
Place
Locale Reference	airport : okc.airport
State Reference	OK
Aircraft 1
Controlling Facilities	tracon : okc.tracon tower : okc.tower tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	589635
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	other anomaly
Independent Detector	aircraft equipment other aircraft equipment : aileron trim other flight crewa other flight crewb
Resolutory Action	flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Aircraft rolled to the right as slats were extended. As we slowed further for landing and flaps 40 degrees were extended, I attempted to trim the rollout only to find that it was jammed. I landed the aircraft without incident. Callback conversation with reporter revealed the following information: reporter stated that the previous crew had reported some problem with the aileron trim, but it wasn't to the point that maintenance action was required. After the selection of full flaps during the approach he indicated the roll rate increased slightly and required additional control inputs. The trim would only operate approximately 1/4 of its normal range. Feedback from maintenance indicated that a roller mechanism in the trim system had failed and been replaced during the layover. The flight crew accepted and flew the aircraft the next day with no difficulties. Asked if this has occurred any other time and the reporter indicated this was the first time he had seen or heard of this type incident.

Original NASA ASRS Text

Title: MD80 FLT CREW HAS JAMMED AILERON TRIM DURING APCH TO OKC.

Narrative: ACFT ROLLED TO THE R AS SLATS WERE EXTENDED. AS WE SLOWED FURTHER FOR LNDG AND FLAPS 40 DEGS WERE EXTENDED, I ATTEMPTED TO TRIM THE ROLLOUT ONLY TO FIND THAT IT WAS JAMMED. I LANDED THE ACFT WITHOUT INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE PREVIOUS CREW HAD RPTED SOME PROB WITH THE AILERON TRIM, BUT IT WASN'T TO THE POINT THAT MAINT ACTION WAS REQUIRED. AFTER THE SELECTION OF FULL FLAPS DURING THE APCH HE INDICATED THE ROLL RATE INCREASED SLIGHTLY AND REQUIRED ADDITIONAL CTL INPUTS. THE TRIM WOULD ONLY OPERATE APPROX 1/4 OF ITS NORMAL RANGE. FEEDBACK FROM MAINT INDICATED THAT A ROLLER MECHANISM IN THE TRIM SYS HAD FAILED AND BEEN REPLACED DURING THE LAYOVER. THE FLT CREW ACCEPTED AND FLEW THE ACFT THE NEXT DAY WITH NO DIFFICULTIES. ASKED IF THIS HAS OCCURRED ANY OTHER TIME AND THE RPTR INDICATED THIS WAS THE FIRST TIME HE HAD SEEN OR HEARD OF THIS TYPE INCIDENT.

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.