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A large transport in cruise at FL390 experienced rudder trim failure both left and right. On ground 1 hour later trim function normal. Suspect cold soak icing.
| Attributes | |
| ACN | 451615 |
| Time | |
| Date | 199910 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | NE |
| Altitude | msl single value : 39000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 45 flight time total : 15000 flight time type : 6500 |
| ASRS Report | 45615 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : rudder trim indicator other flight crewa other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem none taken : anomaly accepted |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Rudder trim used on takeoff at approximately 7000 ft MSL. Functioned normally. Tried retrimming at FL390, rudder trim was inoperative both directions. Contacted dispatch and maintenance control. Tried resetting rudder trim circuit breaker -- no effect. Changed altitude, no effect. VMC conditions entire flight. Dispatch and I determined flight could be conducted safely and we proceeded to phx. Tried rudder trim approximately 1 hour later, and functioned normally. No emergency was ever declared.
Original NASA ASRS Text
Title: A LARGE TRANSPORT IN CRUISE AT FL390 EXPERIENCED RUDDER TRIM FAILURE BOTH L AND R. ON GND 1 HR LATER TRIM FUNCTION NORMAL. SUSPECT COLD SOAK ICING.
Narrative: RUDDER TRIM USED ON TKOF AT APPROX 7000 FT MSL. FUNCTIONED NORMALLY. TRIED RETRIMMING AT FL390, RUDDER TRIM WAS INOP BOTH DIRECTIONS. CONTACTED DISPATCH AND MAINT CTL. TRIED RESETTING RUDDER TRIM CIRCUIT BREAKER -- NO EFFECT. CHANGED ALT, NO EFFECT. VMC CONDITIONS ENTIRE FLT. DISPATCH AND I DETERMINED FLT COULD BE CONDUCTED SAFELY AND WE PROCEEDED TO PHX. TRIED RUDDER TRIM APPROX 1 HR LATER, AND FUNCTIONED NORMALLY. NO EMER WAS EVER DECLARED.
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.