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Flight crew complains that the electric rudder trim control does not always return to neutral position when released.
| Attributes | |
| ACN | 128508 |
| Time | |
| Date | 198911 |
| Place | |
| Locale Reference | atc facility : dfw airport : dal |
| State Reference | TX |
| Aircraft 1 | |
| Controlling Facilities | tower : gso |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 20000 flight time type : 2000 |
| ASRS Report | 128508 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Approximately 1 yr ago, during preflight, the electric rudder trim would not return to center position when released. Maintenance was advised. The rudder trim knob was either too close to the pedestal or dirt under the knob would not allow knob to spring load to center. Maintenance increased the spacing between the knob and the pedestal and the rudder trim then worked properly. Recommended action: spacing appears to be critical, especially as the panel becomes contaminated with dirt. Increased spacing would prevent this recurrence.
Original NASA ASRS Text
Title: FLT CREW COMPLAINS THAT THE ELECTRIC RUDDER TRIM CONTROL DOES NOT ALWAYS RETURN TO NEUTRAL POSITION WHEN RELEASED.
Narrative: APPROX 1 YR AGO, DURING PREFLT, THE ELECTRIC RUDDER TRIM WOULD NOT RETURN TO CENTER POS WHEN RELEASED. MAINT WAS ADVISED. THE RUDDER TRIM KNOB WAS EITHER TOO CLOSE TO THE PEDESTAL OR DIRT UNDER THE KNOB WOULD NOT ALLOW KNOB TO SPRING LOAD TO CENTER. MAINT INCREASED THE SPACING BTWN THE KNOB AND THE PEDESTAL AND THE RUDDER TRIM THEN WORKED PROPERLY. RECOMMENDED ACTION: SPACING APPEARS TO BE CRITICAL, ESPECIALLY AS THE PANEL BECOMES CONTAMINATED WITH DIRT. INCREASED SPACING WOULD PREVENT THIS RECURRENCE.
Data retrieved from NASA's ASRS site as of August 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.