ASN Wikibase Occurrence # 139245
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| Date: | Friday 14 October 2011 |
| Time: | 09:20 |
| Type: |  Hughes 269A |
| Owner/operator: | Private |
| Registration: | N10375 |
| MSN: | 67-18376 |
| Total airframe hrs: | 6176 hours |
| Engine model: | Lycoming HIO-360-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Fort Worth Meacham International Airport - KFTW, TX -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Fort Worth, TX (FTW) |
| Fort Worth, TX (FTW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The certified flight instructor (CFI) and pilot receiving instruction were practicing hovering autorotations on a taxiway. With the skids on the ground for about 20 seconds after completing a hovering autorotation and with the engine at 2,000 rpm, the helicopter began to vibrate and violently shake, consistent with ground resonance. The vibrations and shaking continued to increase and lasted about 15 to 30 seconds. After the shaking stopped, the CFI shut down the helicopter. A postaccident examination of the helicopter revealed that the tail rotor and gearbox separated, and the fuselage was bent and deformed. No preimpact mechanical malfunctions or failures with the helicopter were noted that would have precluded normal operation.
Probable Cause: The inadvertent entry into ground resonance after a hovering autorotation.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Oct-2011 14:37 | RobertMB | Added |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 17:20 | ASN Update Bot | Updated [Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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