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An HS125-800XP flight crew experienced the sudden onset of wing oscillaton/flutter at FL400 which resulted in extreme 'aircraft shaking.' they diverted; declared an emergency; descended; and reduced airspeed; and the oscillations ceased as they passed through FL320. A maintenance inspection was unable to find a cause and the flight crew and their passenger continued to their destination without further incident.
| Attributes | |
| ACN | 1007626 |
| Time | |
| Date | 201204 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | BAe 125 Series 800 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Aeroplane Flight Control |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 50 Flight Crew Total 7000 Flight Crew Type 1200 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Other / Unknown |
Narrative:
We experienced 'coupled' wing oscillations after experiencing light chop/turbulence at FL400. Oscillations occurred at a rate of approximately 2-3 cycles/second with a travel of approximately 12 inches from neutral both up and down; causing extreme airframe shaking. We declared an emergency; were given a descent and vectors to a nearby airport. On descent at approximately FL320 the oscillations stopped. We elected to continue our diversion as a precautionary measure where a normal approach and landing were accomplished. At no time was positive control of the aircraft lost. An examination of the aircraft was made; directed by our company director of maintenance via phone. No airframe damage was noted. Crew and passengers elected to continue the flight to the intended destination and experienced no further incident.
Original NASA ASRS Text
Title: An HS125-800XP flight crew experienced the sudden onset of wing oscillaton/flutter at FL400 which resulted in extreme 'aircraft shaking.' They diverted; declared an emergency; descended; and reduced airspeed; and the oscillations ceased as they passed through FL320. A maintenance inspection was unable to find a cause and the flight crew and their passenger continued to their destination without further incident.
Narrative: We experienced 'coupled' wing oscillations after experiencing light chop/turbulence at FL400. Oscillations occurred at a rate of approximately 2-3 cycles/second with a travel of approximately 12 inches from neutral both up and down; causing extreme airframe shaking. We declared an emergency; were given a descent and vectors to a nearby airport. On descent at approximately FL320 the oscillations stopped. We elected to continue our diversion as a precautionary measure where a normal approach and landing were accomplished. At no time was positive control of the aircraft lost. An examination of the aircraft was made; directed by our company Director of Maintenance via phone. No airframe damage was noted. Crew and passengers elected to continue the flight to the intended destination and experienced no further incident.
Data retrieved from NASA's ASRS site as of July 2013 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.