ASN Wikibase Occurrence # 176566
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| Date: | Monday 26 April 2004 |
| Time: | 16:00 |
| Type: | Hiller UH-12E Soloy |
| Owner/operator: | Sundance Helicopters, Inc. |
| Registration: | N9785C |
| MSN: | 2269 |
| Total airframe hrs: | 9152 hours |
| Engine model: | Allison 250-C20 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Haines, OR -
 United States of America
|
| Phase: | Landing |
| Nature: | Agricultural |
| Departure airport: | Elgin, OR |
| Haines, OR | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot was descending through about 100 feet above the ground at 60 knots airspeed on approach to landing when he heard a loud bang. He immediately transitioned into an autorotation but as he flared prior to touchdown he had insufficient rotor RPM and the helicopter landed hard with the main rotor blades severing the tailboom. The pilot reported that as the helicopter impacted the ground he noted the Rolls Royce (Allison) 250-C20B engine spooling up. He also stated that he did not hear any audible engine out alert during the entire sequence and that the helicopter was not equipped with an auto-relight system. A post-crash test run of the engine revealed no abnormalities. The height-velocity diagram for the helicopter indicated that a successful auto-rotation could be accomplished at an elevation of 100 feet for airspeeds of 41 knots and above.
Probable Cause: A momentary partial loss of power for undetermined reason(s) and the pilot's failure to maintain adequate RPM during his autorotation landing.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20040430X00543&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Jun-2015 16:22 | Noro | Added |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 07-Dec-2017 17:55 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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