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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.
| 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.