ASN Wikibase Occurrence # 138586
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| Date: | Sunday 18 September 2011 |
| Time: | 10:35 |
| Type: |  Beechcraft V35 Bonanza |
| Owner/operator: | Westchester Flying Club, Inc. |
| Registration: | N275BM |
| MSN: | D-8196 |
| Year of manufacture: | 1966 |
| Total airframe hrs: | 5470 hours |
| Engine model: | Continental IO-550-B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Minor |
| Category: | Incident |
| Location: | Tweed-New Haven Airport - KHVN, CT -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | New Haven, CT (HVN) |
| Morristown, NJ (MMU) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During the climb after takeoff, as the airplane approached 6,000 feet mean sea level, the crankshaft fractured, and the airplane experienced a total loss of engine power. The forward portion of the crankshaft, with the propeller attached, departed the engine. The pilot declared an emergency and returned to the departure airport where he performed a forced landing on a runway. The airplane sustained minor nose gear damage when it overran the runway. Examination of the crankshaft revealed that it was fractured across the No. 4 main journal. Metallurgical examination revealed cracks that initiated on the bearing surface near an oil transfer tube and propagated in fatigue.
At the time of the incident, the engine had been operated for about 910 total hours, about 500 hours of which had occurred since maintenance, which was performed about 2 1/2 years before the incident and included the reinstallation of the Nos. 2 and 4 cylinders. The crankcase adjacent to the fractured portion of the crankshaft showed significant fretting on the mating surfaces, possibly due to incorrect torque applied during the previous cylinder repair; however, the investigation could not determine the relevance of that repair, if any, due to the time that had elapsed since the repair was completed.
Probable Cause: The in-flight fatigue failure of the engine’s crankshaft, which resulted in the separation of the forward portion of the crankshaft and the propeller.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Sep-2011 16:47 | RobertMB | Added |
| 19-Sep-2011 03:15 | RobertMB | Updated [Location, Narrative] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 18:11 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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