A crj-200 flight crew experienced abnormal uncommanded rudder trim movement. They ran the QRH; coord...

Attributes
ACN	810254
Time
Date	200811
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	810254
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : rudder trim ind. other flight crewa
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On climb; I felt a yawing motion of the aircraft. I noted from the flight instruments that the coordinator (brick) had gone way to the right of the expected position. I corrected with rudder. Shortly afterward; I noticed that the rudder trim was indicating full nose left trim without any input from us. We complied with the QRH; and the trim was corrected using the normal rudder trim knob. Once we reached a higher altitude; I called dispatch and maintenance control and informed them of the problem. I told them that the problem was corrected and flight control was normal. Maintenance control told us that there would not be parts available at the destination to properly address the fault; so he stated that although it was my decision; he would prefer if we took the aircraft back to ZZZ for proper troubleshooting. I concurred; and the dispatcher did as well. We made ATC arrangements and returned to ZZZ and landed normally. No emergency was declared; priority handling was not requested.

Original NASA ASRS Text

Title: A CRJ-200 FLT CREW EXPERIENCED ABNORMAL UNCOMMANDED RUDDER TRIM MOVEMENT. THEY RAN THE QRH; COORDINATED WITH MAINT; AND RETURNED TO LAND AT THEIR DEPARTURE AIRPORT.

Narrative: ON CLB; I FELT A YAWING MOTION OF THE ACFT. I NOTED FROM THE FLT INSTS THAT THE COORDINATOR (BRICK) HAD GONE WAY TO THE R OF THE EXPECTED POS. I CORRECTED WITH RUDDER. SHORTLY AFTERWARD; I NOTICED THAT THE RUDDER TRIM WAS INDICATING FULL NOSE L TRIM WITHOUT ANY INPUT FROM US. WE COMPLIED WITH THE QRH; AND THE TRIM WAS CORRECTED USING THE NORMAL RUDDER TRIM KNOB. ONCE WE REACHED A HIGHER ALT; I CALLED DISPATCH AND MAINT CTL AND INFORMED THEM OF THE PROB. I TOLD THEM THAT THE PROB WAS CORRECTED AND FLT CTL WAS NORMAL. MAINT CTL TOLD US THAT THERE WOULD NOT BE PARTS AVAILABLE AT THE DEST TO PROPERLY ADDRESS THE FAULT; SO HE STATED THAT ALTHOUGH IT WAS MY DECISION; HE WOULD PREFER IF WE TOOK THE ACFT BACK TO ZZZ FOR PROPER TROUBLESHOOTING. I CONCURRED; AND THE DISPATCHER DID AS WELL. WE MADE ATC ARRANGEMENTS AND RETURNED TO ZZZ AND LANDED NORMALLY. NO EMER WAS DECLARED; PRIORITY HANDLING WAS NOT REQUESTED.

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.

A crj-200 flight crew experienced abnormal uncommanded rudder trim movement. They ran the QRH; coordinated with maintenance; and returned to land at their departure airport.