ASN Wikibase Occurrence # 352775
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Thursday 19 August 1999 |
| Time: | 19:05 LT |
| Type: |  Cessna T210L |
| Owner/operator: | Auburn Flying Service |
| Registration: | N5378V |
| MSN: | 21060923 |
| Year of manufacture: | 1975 |
| Total airframe hrs: | 4070 hours |
| Engine model: | Continental TSIO-520-HCR |
| Fatalities: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Byron, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Groveland, CA (Q68) |
| Concord, CA (KCCR) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot said the aircraft was in level cruise at 6,500 feet msl when the engine suddenly quit without warning. The pilot switched fuel tanks and turned on the electric boost pump, which restored fuel flow on the gage, but the engine did not restart. Coincident with the loss of power, the pilot heard a 'pop' sound come from the engine compartment. The pilot selected an open field and continued to attempt a restart as he prepared for the off-airport landing. The aircraft touched down in the field and rolled some distance before the nose gear collapsed. During the teardown inspection of the engine, all cylinder bases and through bolt studs exhibited evidence of oil leakage. During removal of the cylinders, all through bolt and cylinder hold down stud nuts were loose enough to break torque with one hand using a short open-end wrench. Removal of the cylinders revealed fretted cylinder bases and pads. Separation of the case halves revealed fretting on all cylinder pads and bearing saddle-parting surfaces, with more fretting observed on the No. 2 main bearing saddle surfaces. The No. 2 main bearing was fragmented and found in the oil sump, with erosion and smearing evident to the bearing saddle. The crankshaft was fractured across the No. 3 short cheek, with heavy scoring evident to the Nos. 2 and 3 main journals. Review of the maintenance records disclosed that cylinders 1, 2, 4, 5, and 6 were replaced on March 24, 1997, 232 hours prior to the accident.
Probable Cause: The failure of the operator's maintenance personnel to properly torque the cylinder and engine case through bolts during the replacement of five cylinders, which led to the spinning of the No. 2 main bearing and the resultant oil starvation induced catastrophic internal engine failure.
Accident investigation:
 |
|
Sources:
NTSB LAX99LA277
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Mar-2024 17:53 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation