ASN Wikibase Occurrence # 231365
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| Date: | Thursday 12 December 2019 |
| Time: | 19:00 LT |
| Type: |  Cessna 182P Skylane II |
| Owner/operator: | private |
| Registration: | N182EF |
| MSN: | 18261392 |
| Year of manufacture: | 1972 |
| Total airframe hrs: | 3235 hours |
| Engine model: | Continental O-470-50 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Carlsbad, San Diego County, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | El Monte-San Gabriel Valley Airport, CA (EMT/KEMT) |
| Carlsbad-McClellan-Palomar Airport, CA (CLD/KCRQ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot stated that during the flight, the airplane's engine started to run rough. Despite troubleshooting, the engine roughness increased followed by 'flash explosions' from the engine and the smell of oil in the cabin. The engine lost total power, and the pilot performed a forced landing to an interstate highway. The airplane landed hard, which resulted in substantial damage to the fuselage.
A postaccident examination of the engine revealed that the Nos. 5 and 6 connecting rods separated from the crankshaft. The crankshaft separated into three sections. One of the separations was at the crankshaft cheek forward and adjacent to the No. 3 bearing journal, and the separation surfaces displayed beach marks consistent with fatigue cracking. Metallurgical examination revealed that the fracture appeared to initiate below the outer nitride layer near an oxide inclusion within the metal.
The engine was overhauled and converted from the original Continental O-470-U engine to a PPA O-470-50 engine per a supplemental type certificate (STC). Additionally, a supercharger was installed on the engine, which was not part of the engine conversion STC. No logbook entries were found regarding the installation of the supercharger. It is likely that the installation of the supercharger contributed additional stress to the crankshaft during operation, which resulted in the separation of the crankshaft and subsequent catastrophic engine failure.
Probable Cause: The fatigue failure of the crankshaft. Contributing to the accident was the undocumented installation of the supercharger, which resulted in increased stress on the crankshaft.
Accident investigation:
 |
|
Sources:
NTSB WPR20LA042
FAA register: https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=182EF
Location
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Dec-2019 06:41 | Geno | Added |
| 13-Dec-2019 08:18 | RobertMB | Updated [Aircraft type, Location, Nature, Source, Narrative] |
| 08-Mar-2020 13:09 | Anon. | Updated [Embed code] |
| 24-Jun-2022 18:36 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Destination airport, Source, Damage, Narrative, Category, Accident report] |
| 24-Jun-2022 18:53 | harro | Updated [Operator, Destination airport, Source, Narrative] |
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