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Rudder trim switch on advanced medium large transport allegedly stuck in both right and left positions.
| Attributes | |
| ACN | 129771 |
| Time | |
| Date | 198911 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Aircraft 1 | |
| Controlling Facilities | tower : hlg |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | ground : holding |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 230 flight time total : 11250 flight time type : 2500 |
| ASRS Report | 129771 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
While on the ground, we discovered that the rudder trim switch would stick in both the left and right positions, thus changing the rudder trim without the pilot's knowledge! I understand that this situation is being investigated as a possible cause of the recent accident. I believe that there should be an aural warning to the crew any time that any of the 3 electric trim systems is activated.
Original NASA ASRS Text
Title: RUDDER TRIM SWITCH ON ADVANCED MLG ALLEGEDLY STUCK IN BOTH RIGHT AND LEFT POSITIONS.
Narrative: WHILE ON THE GND, WE DISCOVERED THAT THE RUDDER TRIM SWITCH WOULD STICK IN BOTH THE LEFT AND RIGHT POSITIONS, THUS CHANGING THE RUDDER TRIM WITHOUT THE PLT'S KNOWLEDGE! I UNDERSTAND THAT THIS SITUATION IS BEING INVESTIGATED AS A POSSIBLE CAUSE OF THE RECENT ACCIDENT. I BELIEVE THAT THERE SHOULD BE AN AURAL WARNING TO THE CREW ANY TIME THAT ANY OF THE 3 ELECTRIC TRIM SYSTEMS IS ACTIVATED.
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.