A B737 first officer reported the rudder trim required 5 units of left trim during climb but increased to 15 units at cruise with 8-9 unit of aileron trim. The flight returned to the departure airport.

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Attributes
ACN	1348105
Time
Date	201604
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Rudder
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

During initial climb pilot flying had to use 5 units left trim to center yoke; at initial cruise he had to use over 8 units left trim. Then trim kept moving to 15 units left trim; rudder and yoke did not move after 8 to 9 units. Captain said to return to the departure airport. I took over as pilot flying and landed overweight; no further incident.

Original NASA ASRS Text

Title: A B737 First Officer reported the rudder trim required 5 units of left trim during climb but increased to 15 units at cruise with 8-9 unit of aileron trim. The flight returned to the departure airport.

Narrative: During initial climb Pilot Flying had to use 5 units left trim to center yoke; at initial cruise he had to use over 8 units left trim. Then trim kept moving to 15 units left trim; rudder and yoke did not move after 8 to 9 units. Captain said to return to the departure airport. I took over as pilot flying and landed overweight; no further incident.

Data retrieved from NASA's ASRS site 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.