ASN Wikibase Occurrence # 30497
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| Date: | Tuesday 22 June 1999 |
| Time: | 14:30 LT |
| Type: |  Hughes 369 |
| Owner/operator: | Olympic Air Inc. |
| Registration: | N1089Y |
| MSN: | 510962D |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 15399 hours |
| Engine model: | Allison C20-B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Sanderson Field, Shelton, Mason County, Washington, -
 United States of America
|
| Phase: | Landing |
| Nature: | Executive |
| Departure airport: | Rockaway, OR |
| (KSHN) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was practicing autorotations from an altitude of approximately 200 feet above ground level (AGL) and an airspeed of approximately 50 knots. During the second practice autorotation, the pilot reduced power with throttle and used collective to adjust rotor speed to 410 RPM (minimum RPM for practice autorotations). The rotor RPM decreased below 410 RPM and the aircraft rapidly started to descend. Before the pilot was able to recover, the aircraft collided with the ground and rolled over. The aircraft sustained substantial damage to the main rotor blades, tail rotor, tail boom and fuselage. The pilot reported no mechanical failures or malfunctions with the aircraft at the time of the accident.
Probable Cause: The pilot's failure to maintain rotor RPM during an autorotation.
Accident investigation:
 |
|
Sources:
NTSB SEA99LA092
FAA register: NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X19122&key=1
FAA register: 3. http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=1089Y
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 23-Feb-2015 00:02 | Dr. John Smith | Updated [Time, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative] |
| 14-Dec-2017 08:28 | ASN Update Bot | Updated [Time, Operator, Nature, Departure airport, Destination airport, Source, Damage, Narrative] |
| 07-Apr-2024 19:43 | ASN Update Bot | Updated [Time, Other fatalities, Destination airport, Source, Narrative, Accident report] |
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