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| Date: | Monday 28 May 2001 |
| Time: | 14:30 LT |
| Type: |  Lancair IV-P |
| Owner/operator: | Private |
| Registration: | N707SH |
| MSN: | LIV-363 |
| Total airframe hrs: | 60 hours |
| Engine model: | Continental TSIO-550-E1B |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Bennett, CO -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Denver-Front Range Airport, CO (KFTG) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in cruise flight, the oil pressure warning light illuminated, and the oil pressure gauge fluctuated between 0 and 10 psi. The engine made a loud noise and began to vibrate and lose power. A forced landing was made in an open field. After touch down, the left main and nose landing gear buckled, then the right main gear collapsed, shearing off the right wing. During the engine disassembly and inspection, it was discovered that the starter adapter drive shaft had fractured forward of the oil scavenge pump gears at a snap ring groove. This allowed pressurized lubricating oil to be discharged through the turbocharger turbine and compressor oil seals. Metallurgical examination concluded that the fracture was in fatigue and had initiated at multiple origins at the snap ring groove root fillet.
Probable Cause: unsuitable terrain on which to make a forced landing. A contributing factor was a fatigue fracture of the starter adapter drive shaft, which resulted in a loss of engine power due to oil starvation.
Accident investigation:
 |
|
Sources:
NTSB DEN01LA103
History of this aircraft
Other occurrences involving this aircraft
| 31 May 2004 | N707SH | Ward Synthesis Inc | 3 | Vermontville, MI | |
w/o |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Apr-2024 08:33 | ASN Update Bot | Added |
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