ASN Wikibase Occurrence # 291630
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| Date: | Monday 20 November 2006 |
| Time: | 12:38 LT |
| Type: |  Stinson 108-1 |
| Owner/operator: | Private |
| Registration: | N97949 |
| MSN: | 108-949 |
| Engine model: | Franklin 6A4150 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | San Jose, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | San Jose-Reid-Hillview Airport, CA (RHV/KRHV) |
| San Jose, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
According to the pilot, he was flying above hilly terrain southeast of the airport when he heard a loud bang, followed by a violent vibration coming from the engine. The pilot added that the engine did not experience a total loss of power, but performed poorly due to the severe vibration. The pilot reduced the throttle and the vibration subsided, but when he added more throttle the violent vibration returned. The pilot then decided that it was unsafe to continue the flight and began searching for a place to land. He made a forced landing in a pasture, which was uneventful until one of the main landing gear contacted a "deviation" in the ground. The airplane nosed over and came to rest inverted. In a phone interview with the investigator-in-charge, a mechanic, who recovered the wreckage, reported that he examined the engine and discovered that the number 3 cylinder exhaust valve was stuck. The corresponding push rod tube was also bent, and the number 3 connecting rod was still intact.
Probable Cause: Partial loss of engine power due to a seized exhaust valve during cruise flight. Rough terrain at the forced landing site was a contributing factor.
Accident investigation:
 |
|
Sources:
NTSB LAX07LA040
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Oct-2022 17:03 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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