ASN Wikibase Occurrence # 355108
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| Date: | Sunday 19 October 1997 |
| Time: | 10:30 LT |
| Type: |  Cessna 150M |
| Owner/operator: | Private |
| Registration: | N7814U |
| MSN: | 150-77847 |
| Total airframe hrs: | 5603 hours |
| Engine model: | Continental O-200A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Miami, FL -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | , FL (KHWO) |
| Marathon, FL (KMTH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
About 10 minutes into the flight, at a cruise altitude of 1000 feet, the pilot experienced a loss of engine power. He radioed a 'mayday' call and selected a nearby golf course for an emergency landing. The airplane collided with a palm tree during the emergency landing roll. Examination of the engine assembly revealed that number one cylinder lower spark plug was partially separated from the cylinder. During the subsequent engine teardown, the number one exhaust valve head was recovered from inside the cylinder. The examination also of the exhaust valve stem and the and the valve stem keepers showed excessive wear. The valve stem keepers had also separated from their normally installed positions. A review of the aircraft maintenance logs disclosed that the engine had undergone several major engine repairs, involving the valve assemblies, within the last ten years. An engine top overhaul was completed 370 hours before this accident. The engine had accumulated a total of 5,603 hours.
Probable Cause: excessive wear to the number one valve stem and valve stem keepers that resulted in the separation of the valve assembly.
Accident investigation:
 |
|
Sources:
NTSB ATL98LA003
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 08:25 | ASN Update Bot | Added |
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