ASN Wikibase Occurrence # 144393
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| Date: | Tuesday 13 March 2012 |
| Time: | 17:45 |
| Type: | Safari |
| Owner/operator: | Private |
| Registration: | N105KM |
| MSN: | 2008005-S2172 |
| Year of manufacture: | 2009 |
| Total airframe hrs: | 126 hours |
| Engine model: | Superior IO-360 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Middle Valley, Hamilton County, TN -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Hixson, TN |
| Hixson, TN | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot of the experimental amateur-built helicopter reported that the engine shuddered twice momentarily shortly after takeoff and then lost power. After observing the engine rpm drop from about 2,700 to 1,500, the pilot initiated an autorotation and subsequently landed the helicopter on top of a tree, which began to lower toward a creek. The helicopter came to rest partially submerged in the creek and was partially consumed by a postcrash fire. Postaccident examination of the wreckage did not reveal any preimpact malfunctions or failures that would have precluded normal operation; however, impact and fire damage precluded the ability to functionally check the engine and fuel system. Review of engine monitor data, which was recorded at 5-second intervals, did not reveal any drops in engine rpm or any other anomalies consistent with the pilot’s statement.
Probable Cause: A partial loss of engine power for reasons that could not be determined due to the postaccident condition of the airframe and engine.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2012 09:31 | gerard57 | Added |
| 14-Mar-2012 10:28 | Geno | Updated [Aircraft type, Registration, Cn, Location, Departure airport, Source] |
| 08-Apr-2012 17:08 | Geno | Updated [Time, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 20:27 | ASN Update Bot | Updated [Cn, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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