ASN Wikibase Occurrence # 355450
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Date: | Sunday 3 August 1997 |
Time: | 10:30 LT |
Type: | Piper J3C-65 |
Owner/operator: | Private |
Registration: | N5985V |
MSN: | 13-640 |
Year of manufacture: | 1945 |
Total airframe hrs: | 4954 hours |
Engine model: | Continental C-85-F12 |
Fatalities: | Fatalities: 0 / Occupants: 1 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Castle Rock, CO -
United States of America
|
Phase: | En route |
Nature: | Private |
Departure airport: | Englewood, CO (APA |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:While in cruise flight, engine RPMs dropped from 2,350 to 1,700, and the airplane began to descend. The pilot made a forced landing in an open, uneven field. The landing gear was sheared off and the fuselage was buckled. Postaccident examination of the engine disclosed the no. 4 cylinder exhaust valve was jammed in the open position. The valve stem and guide were coated with 'gummy black deposits.' The pilot had a similar accident on July 22, 1995 (FTW 95-L-A312). In that accident, the jammed exhaust valve was attributed to excessive carbon deposits from high octane aviation gasoline usage in a low compression engine.
Probable Cause: A partial loss of engine power due to a cylinder exhaust valve jammed in the open position from excessive carbon deposits. A factor was the lack of suitable terrain on which to make a forced landing.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | FTW97LA298 |
Status: | Investigation completed |
Duration: | 6 months |
Download report: | Final report |
|
Sources:
NTSB FTW97LA298
Location
Revision history:
Date/time | Contributor | Updates |
12-Mar-2024 12:08 |
ASN Update Bot |
Added |
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