ASN Wikibase Occurrence # 355640
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| Date: | Wednesday 2 July 1997 |
| Time: | 14:30 LT |
| Type: |  Cessna T210M |
| Owner/operator: | Private |
| Registration: | N761FM |
| MSN: | 21062222 |
| Total airframe hrs: | 1442 hours |
| Engine model: | Continental TSIO-520-R9B |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Kerrville, TX -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | (KERV) |
| Tyler, TX (KTYR) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane was on its climb to cruise when the engine lost power. The pilot performed a forced landing short of the runway in rough and uneven terrain. An examination of the engine revealed that the #1 cylinder piston was seized in the cylinder, the piston rings were broken, the piston head was deteriorated around the edge down to the top compression ring with a portion of the ring missing, metal was deposited on the intake valve seat, and the intake valve was stuck in the open position. The #1 cylinder dome was damaged and scaring was noted on the cylinder walls. Aluminum particles were found in the #1 cylinder spark plugs and embedded in the #1 cylinder combustion chamber and internal components of the engine. According to the manufacturer, no discrepancies were found with the engine components that 'would have caused detonation/preignition to [the] number 1 cylinder.' The cylinder met the SAE chemistry requirements. The manufacturer's metallurgist stated that 'the burning of the piston crown most likely is the result of either detonation or pre-ignition.'
Probable Cause: The disintegration of the #1 cylinder piston resulting from a detonation/pre-ignition condition due to an unknown reason. A factor was the lack of suitable terrain for the forced landing.
Accident investigation:
 |
|
Sources:
NTSB FTW97LA246
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 14:05 | ASN Update Bot | Added |
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