ASN Wikibase Occurrence # 288955
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| Date: | Sunday 14 August 2011 |
| Time: | 15:00 LT |
| Type: |  Beechcraft B36TC |
| Owner/operator: | |
| Registration: | N6465X |
| MSN: | EA-306 |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 2364 hours |
| Engine model: | Continental TSIO-520 SER |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Lemoore, California -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Palm Springs-Bermuda Dunes Airport, CA (UDD/KUDD) |
| Byron, CA (C83) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that, while at cruise altitude, the engine experienced a partial loss of engine power. The pilot requested to land, and then heard a loud noise, followed by the engine cowling opening, and the pilot noted something fly out of the engine compartment followed by a total loss of engine power. Unable to reach the airport, the pilot subsequently made a forced landing in a plowed field. Postaccident examination of the engine revealed that the number 4 cylinder and piston had separated from the engine in flight and likely departed through the open engine cowling. The crankcase had mechanical damage concentrated at the number 4 and 6 cylinder bay areas. The number 4 cylinder bay area had missing crankcase material, with rubbed and displaced material noted on the cylinder attachment area. Further examination of the remaining cylinders found that the retaining self-locking nuts were loose and had not been tightened or properly torqued. Review of maintenance records noted that the engine had been overhauled less than 40 flight hours before the accident. It is likely that maintenance personnel did not properly tighten the self-locking nuts for the number 4 cylinder, which subsequently led to its separation.
Probable Cause: A loss of engine power during cruise flight due to maintenance personnel's failure to adequately torque the number 4 cylinder retaining nuts, which resulted in the in-flight separation of the cylinder.
Accident investigation:
 |
|
Sources:
NTSB WPR11LA380
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Oct-2022 08:08 | ASN Update Bot | Added |
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