ASN Wikibase Occurrence # 353453
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| Date: | Tuesday 29 December 1998 |
| Time: | 18:45 LT |
| Type: |  Ercoupe 415-C |
| Owner/operator: | Private |
| Registration: | N99371 |
| MSN: | 1994 |
| Total airframe hrs: | 2559 hours |
| Engine model: | Continental C-85 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | San Ysabel, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Ramona, CA (KRNM) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
In cruise flight at 4,500 feet, the pilot added power as the terrain began to rise, then the engine started to vibrate. As the pilot looked down to check the mixture and carburetor heat, the vibration intensified. The crankshaft fractured and the propeller separated from the airplane. The pilot subsequently made a forced landing on uneven terrain and the nose gear collapsed. Metallurgical laboratory examination of the remaining crankshaft piece determined the crankshaft separated forward of the oil-slinger flange due to fatigue. The fatigue region had an origin point in an area mechanically damaged during the crankshaft failure.
Probable Cause: A fatigue fracture of the crankshaft and the resulting separation of the propeller.
Accident investigation:
 |
|
Sources:
NTSB LAX99LA061
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Mar-2024 06:57 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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