ASN Wikibase Occurrence # 17036
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Date: | Saturday 29 March 2008 |
Time: | 16:54 |
Type: | Cessna P210N Pressurized Centurion |
Owner/operator: | Private |
Registration: | N4839P |
MSN: | P21000120 |
Year of manufacture: | 1978 |
Total airframe hrs: | 2562 hours |
Engine model: | Teledyne Continental TSIO-520-P |
Fatalities: | Fatalities: 0 / Occupants: 3 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | near Elizabeth, CO -
United States of America
|
Phase: | Landing |
Nature: | Private |
Departure airport: | Lamar, CO (LAA) |
Destination airport: | Denver, CO (APA) |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:During a normal descent on approach for landing at 8,500 feet mean sea level, the engine "let go/popped into a higher pitch sound, and the power dropped off. [The pilot] checked the fuel flow, tried to get power with the throttle, but no response." During a forced landing, the airplane impacted the side of a gravel road, traveled across the road, struck a ditch, and skidded on the fuselage bottom for approximately 75 feet were it came to rest upright in a residential yard. Examination of the engine exhibited fretting on all six cylinder decks and the main bearing case half sections. The number 2 main bearing support bearing tang lock-slot was found elongated. Various degrees of wear were noted on all crankshaft main bearings, and the number 2 main bearing showed additional wear. The crankshaft number 2 main journal exhibited signatures of thermal discoloration. All oil transfer galleries were free and clear of debris. The camshaft was intact, however, the camshaft gear had a semi-circular section with 7 gear teeth separated, which was found in the gearbox. Metallurgical examination showed the fracture initiated at the surface and progressed in fatigue. The initiation site was damaged; however, the approximate location was identified by crack arrest lines, which encircled the origin. The reason for the fracture initiation could not be determined.
Probable Cause: the loss of engine power due to the fatigue failure of the camshaft gear. Contributing to the accident was the lack of suitable terrain for the forced landing.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | DEN08LA069 |
Status: | Investigation completed |
Duration: | 9 months |
Download report: | Final report |
|
Sources:
NTSB
Location
Revision history:
Date/time | Contributor | Updates |
03-Apr-2008 21:24 |
Fusko |
Added |
21-Jul-2008 05:38 |
Anon. |
Updated |
10-Jun-2013 15:40 |
Uli Elch |
Updated [Narrative] |
10-Jun-2013 19:41 |
harro |
Updated [Aircraft type, Registration, Source, Narrative] |
21-Dec-2016 19:13 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
21-Dec-2016 19:14 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
21-Dec-2016 19:16 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
21-Dec-2016 19:20 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
03-Dec-2017 10:21 |
ASN Update Bot |
Updated [Cn, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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