ASN Wikibase Occurrence # 66424
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| Date: | Wednesday 15 July 2009 |
| Time: | 17:30 |
| Type: |  RotorWay Exec 162F |
| Owner/operator: | R L BIELAWA ASSOCIATES INC |
| Registration: | N3213K |
| MSN: | 6804 |
| Total airframe hrs: | 5 hours |
| Engine model: | Rotorway 162F |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Sequim Valley Airport (W28), Sequim, Washington -
 United States of America
|
| Phase: | Standing |
| Nature: | Training |
| Departure airport: | Sequim, WA (W28) |
| Sequim, WA (W28) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During a stationary low hover of the recently built experimental helicopter, it suddenly and without warning rotated rapidly in a counter-clockwise direction around its longitudinal axis, and immediately impacted the ground. The investigation determined that one of the main rotor blades had failed (disbonded), leading to an immediate loss of control in flight. The composite blade, which was designed specifically for use on one manufacturer's experimental helicopter, was being used on another manufacturer's experimental helicopter, as allowed by its experimental designation. Due to the lack of sufficient engineering, manufacturing, and testing data, the precise initiating factor of the disbonding event could not be determined.
Probable Cause: The failure (disbonding) of a composite main rotor blade for undetermined reasons, leading to an immediate loss of control in flight during hover.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Jul-2009 07:19 | slowkid | Added |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 02-Dec-2017 15:48 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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