Runway rudder trim.

Attributes
ACN	267516
Time
Date	199403
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : yyz
State Reference	ON
Altitude	msl bound lower : 8000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : yyz
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 11500 flight time type : 4000
ASRS Report	267516
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

En route from yyz to phl while I was executing the PNF duties and communicating with ATC. Captain called for me to check the rudder trim. When I looked the trim indicator appeared to be moving between 10 and 11 units left. I began to move the indicator back to center after stating to captain the position indicated. He stated he thought we might had been having an engine failure due to yaw, he started to feel. But all engine indicators were rudder trim. The flight was continued uneventfully with no other occurrence of uncommanded rudder trim noted. We landed in phl. Captain then made required log book write up.

Original NASA ASRS Text

Title: RWY RUDDER TRIM.

Narrative: ENRTE FROM YYZ TO PHL WHILE I WAS EXECUTING THE PNF DUTIES AND COMMUNICATING WITH ATC. CAPT CALLED FOR ME TO CHK THE RUDDER TRIM. WHEN I LOOKED THE TRIM INDICATOR APPEARED TO BE MOVING BTWN 10 AND 11 UNITS L. I BEGAN TO MOVE THE INDICATOR BACK TO CTR AFTER STATING TO CAPT THE POS INDICATED. HE STATED HE THOUGHT WE MIGHT HAD BEEN HAVING AN ENG FAILURE DUE TO YAW, HE STARTED TO FEEL. BUT ALL ENG INDICATORS WERE RUDDER TRIM. THE FLT WAS CONTINUED UNEVENTFULLY WITH NO OTHER OCCURRENCE OF UNCOMMANDED RUDDER TRIM NOTED. WE LANDED IN PHL. CAPT THEN MADE REQUIRED LOG BOOK WRITE UP.

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.