ASN Wikibase Occurrence # 353713
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Date: | Tuesday 29 September 1998 |
Time: | 16:55 LT |
Type: | Cessna 150L |
Owner/operator: | Northway Aviation, Inc. |
Registration: | N5867C |
MSN: | 15072277 |
Year of manufacture: | 1970 |
Total airframe hrs: | 5235 hours |
Engine model: | Continental O-200-A |
Fatalities: | Fatalities: 0 / Occupants: 1 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Freeland, WA -
United States of America
|
Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
Nature: | Training |
Departure airport: | Everett, WA (KPAE) |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:The pilot reported that, while practicing 'S' turns at 2,500 feet above ground, the engine shuddered and then stopped. After an unsuccessful restart, the student maneuvered to a nearby field, and executed a forced landing during which the nose gear folded as the aircraft passed across an irrigation ditch. The aircraft then nosed over. During examination of the engine, the number two cylinder rocker arm for the intake valve was observed to be broken at its hinge point. Inspection of the fracture surface revealed fatigue striations originating in the vicinity of the oil lubrication port on the rocker arm. No mechanical damage or microstructural abnormalities were found associated with the area of apparent fatigue cracking.
Probable Cause: Failure of the number two intake valve rocker arm in fatigue, and overload of the nose landing gear assembly. Factors include a ditch encountered during the forced landing.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | SEA98LA188 |
Status: | Investigation completed |
Duration: | 1 year and 3 months |
Download report: | Final report |
|
Sources:
NTSB SEA98LA188
Location
Revision history:
Date/time | Contributor | Updates |
10-Mar-2024 09:45 |
ASN Update Bot |
Added |
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