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Flight crew of an medium large transport experienced severe rudder 'kicking' right and left impulses during climb out and was uncontrollable until the yaw damper was disengaged.
| Attributes | |
| ACN | 323260 |
| Time | |
| Date | 199512 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : iah |
| State Reference | TX |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : iah |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 10500 flight time type : 7000 |
| ASRS Report | 323260 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Leaving approximately 4000 ft MSL the rudder began to kick left then right approximately once each second. After approximately 30-45 seconds we disconnected the yaw damper and kicking immediately stopped. At approximately 1000 ft we attempted to reengage the yaw damper. The rudder then kicked very hard to the left. We immediately turned the yaw damper back off and continued the remainder of the flight with no kicks.
Original NASA ASRS Text
Title: FLC OF AN MLG EXPERIENCED SEVERE RUDDER 'KICKING' R AND L IMPULSES DURING CLBOUT AND WAS UNCONTROLLABLE UNTIL THE YAW DAMPER WAS DISENGAGED.
Narrative: LEAVING APPROX 4000 FT MSL THE RUDDER BEGAN TO KICK L THEN R APPROX ONCE EACH SECOND. AFTER APPROX 30-45 SECONDS WE DISCONNECTED THE YAW DAMPER AND KICKING IMMEDIATELY STOPPED. AT APPROX 1000 FT WE ATTEMPTED TO REENGAGE THE YAW DAMPER. THE RUDDER THEN KICKED VERY HARD TO THE L. WE IMMEDIATELY TURNED THE YAW DAMPER BACK OFF AND CONTINUED THE REMAINDER OF THE FLT WITH NO KICKS.
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.