ASN Wikibase Occurrence # 150883
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| Date: | Sunday 25 November 2012 |
| Time: | 15:05 |
| Type: |  Cessna U206 Super Skywagon |
| Owner/operator: | Clipper 29 Uniform LLC |
| Registration: | N5229U |
| MSN: | 206-0229 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 8525 hours |
| Engine model: | Continental IO-520-A 32B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | On a soccer field at Cal State Northridge, Northridge, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Novato, CA (DVO) |
| Santa Ana, CA (SNA) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that the airplane was in cruise flight when the engine started backfiring and he smelled burnt oil; the engine subsequently lost partial power. During the forced landing on a soccer field, the airplane sustained substantial damage when it collided with a fence and trees before coming to rest on its left side. Postaccident examination of the engine revealed that the engine crankshaft would not rotate. A borescope inspection revealed that a valve in the No. 2 cylinder was in contact with a piston face. All of the piston heads exhibited semicircular indentations near the location of the valves. Upon disassembly, six gear teeth on the crankshaft gear were found fractured, and all of the teeth on the camshaft gear were found ground off. A metallurgical examination of the separated crankshaft gear teeth revealed that two of the fracture surfaces exhibited fatigue with areas of corrosion pitting and that the other fracture surfaces exhibited evidence of overload.
Probable Cause: A partial loss of engine power during cruise flight due to fatigue fractures of two crankshaft gear teeth from corrosion pitting, which resulted in an off-airport forced landing and collision with obstacles on the ground.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Nov-2012 11:48 | gerard57 | Added |
| 26-Nov-2012 14:21 | Geno | Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Phase, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 13:54 | ASN Update Bot | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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