ASN Wikibase Occurrence # 215453
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| Date: | Thursday 20 October 2016 |
| Time: | 07:30 |
| Type: |  Lancair IV-P |
| Owner/operator: | Private |
| Registration: | N4YB |
| MSN: | LIV-482 |
| Year of manufacture: | 2003 |
| Total airframe hrs: | 865 hours |
| Engine model: | Continental TSIO-550 SER |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Lovelock, NV -
 United States of America
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Fallon, NV (FLX) |
| Burns, OR (BNO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airline transport pilot reported that, while climbing to cruise altitude, about 9 minutes into the cross-country flight, he felt a severe shudder and the engine experienced a total loss of power. Simultaneously, oil began to coat the windscreen. The pilot maneuvered for a nearby airport; however, as he neared the airport, he realized that the airplane would not reach the runway and elected to land in an open area of desert vegetation.
Postaccident examination of the engine revealed a hole in the crankcase above the Nos. 3 and 4 connecting rod journals. The Nos. 3 and 4 pistons were fractured into several pieces, which were located within the engine. The No. 3 connecting rod had separated from the crankshaft. The No. 3 cylinder intake valve head was broken at the bottom of the valve guide; the valve head was not located within the engine.
A visual examination by a metallurgist was unable to determine the initial failure mode given the postfracture mechanical damage to the fractured end of the valve stem and the absence of the separated valve head; however, due to the quantity and severity of damage found throughout the engine, the likely initial point of failure was a fracture to the intake valve in the No. 3 cylinder.
Probable Cause: A total loss of engine power due to the failure of the intake valve in the No. 3 cylinder for reasons that could not be determined based on the available information.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Sep-2018 19:09 | ASN Update Bot | Added |
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