ASN Wikibase Occurrence # 145288
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| Date: | Tuesday 17 April 2012 |
| Time: | 11:16 |
| Type: |  Hughes 269A |
| Owner/operator: | Private |
| Registration: | N69HJ |
| MSN: | 580869 |
| Total airframe hrs: | 3085 hours |
| Engine model: | Lycoming HIO-360-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Grinnell Regional Airport, IA -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Grinnell, IA (GGI) |
| Grinnell, IA (GGI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter began to vibrate as the pilot raised the collective for liftoff. The pilot lowered the collective and closed the throttle when the vibration began; however, he was too late in recognizing the onset of ground resonance, which resulted in a violent, uncontrollable oscillation and separation of the tail boom from the fuselage. Examination of the helicopter revealed no anomalies that would have precluded normal operation.
Probable Cause: The pilot's improper liftoff technique, which resulted in ground resonance, and the pilot's delayed recognition of the ground resonance.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Apr-2012 12:05 | Geno | Added |
| 26-Sep-2016 20:50 | Aerossurance | Updated [Time, Aircraft type, Location, Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 20:34 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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