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Rudder trim tab stopped working with switch movement in the extreme left and right position. Trim appeared to be in a stuck position.
| Attributes | |
| ACN | 305236 |
| Time | |
| Date | 199505 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mco |
| State Reference | FL |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : cak |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | ground : preflight |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : private |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 7000 |
| ASRS Report | 305236 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On taxi out, the spring-load function of the rudder trim knob would not work if the knob positioned full left or right and then released. All other position and functions operate normally. Spring-load function also operated normally upon arrival at destination. Callback conversation with reporter revealed the following information: reporter stated that the rudder trim would work properly if the trim knob was moved partially. Whenever moved fully, it would stick in that position. Movement could always be controled if it was moved in small incremental movements. At no time did the rudder trim knob stick in a position that would drive the trim continuously to full displacement.
Original NASA ASRS Text
Title: RUDDER TRIM TAB STOPPED WORKING WITH SWITCH MOVEMENT IN THE EXTREME L AND R POS. TRIM APPEARED TO BE IN A STUCK POS.
Narrative: ON TAXI OUT, THE SPRING-LOAD FUNCTION OF THE RUDDER TRIM KNOB WOULD NOT WORK IF THE KNOB POSITIONED FULL L OR R AND THEN RELEASED. ALL OTHER POS AND FUNCTIONS OPERATE NORMALLY. SPRING-LOAD FUNCTION ALSO OPERATED NORMALLY UPON ARR AT DEST. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE RUDDER TRIM WOULD WORK PROPERLY IF THE TRIM KNOB WAS MOVED PARTIALLY. WHENEVER MOVED FULLY, IT WOULD STICK IN THAT POS. MOVEMENT COULD ALWAYS BE CTLED IF IT WAS MOVED IN SMALL INCREMENTAL MOVEMENTS. AT NO TIME DID THE RUDDER TRIM KNOB STICK IN A POS THAT WOULD DRIVE THE TRIM CONTINUOUSLY TO FULL DISPLACEMENT.
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.