ASN Wikibase Occurrence # 358453
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| Date: | Sunday 13 August 1995 |
| Time: | 20:20 LT |
| Type: |  Beechcraft V35A Bonanza |
| Owner/operator: | Private |
| Registration: | N8469N |
| MSN: | D-8802 |
| Total airframe hrs: | 2292 hours |
| Engine model: | CONTINENTAL IO-520-B |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Chimacum, WA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Olympia, WA (KOLM) |
| Port Townsend, WA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During flight the pilot encountered an engine vibration, and shortly thereafter oil began appearing on the windscreen. While maneuvering toward suitable terrain the #2 cylinder departed the aircraft. A forced landing was made to a field. The aircraft impacted several fence posts, and the landing gear collapsed as it traversed rough/uneven terrain. Engine records documented a top overhaul of the engine approximately 172 hours before, during which the cylinders were removed and replaced. Metallurgical examination revealed that several cylinder hold-down nuts had backed off their bolts, or the bolts had separated in fatigue, allowing the cylinder to break free of the engine case. The mechanic reported using a silicone sealant between the cylinders and their respective engine case halves. Application of the uncalled-for sealant between the cylinders and case halves could result in a reduction or elimination of the preload torque applied to the through-bolts and hold-down studs.
Probable Cause: the improper top overhaul of the engine and subsequent release of the cylinder hold-down nuts/breakage of hold-down and through-bolts. Factors contributing to the accident were the fence posts and rough/uneven terrain.
Accident investigation:
 |
|
Sources:
NTSB SEA95LA183
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 14:34 | ASN Update Bot | Added |
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