Air carrier medium large transport had a minor rudder trim malfunction.

Attributes
ACN	148673
Time
Date	199006
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 15000 msl bound upper : 15000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 5000 flight time type : 200
ASRS Report	148673
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	aircraft : equipment problem dissipated flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After using electric rudder trim control to trim the aircraft, system continued to input left rudder trim after control knob was released and had returned to center position. Aircraft was retrimmed and problem could not be duplicated.

Original NASA ASRS Text

Title: ACR MLG HAD A MINOR RUDDER TRIM MALFUNCTION.

Narrative: AFTER USING ELECTRIC RUDDER TRIM CTL TO TRIM THE ACFT, SYS CONTINUED TO INPUT L RUDDER TRIM AFTER CTL KNOB WAS RELEASED AND HAD RETURNED TO CTR POS. ACFT WAS RETRIMMED AND PROB COULD NOT BE DUPLICATED.

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.