ASN Wikibase Occurrence # 191321
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| Date: | Sunday 13 November 2016 |
| Time: | 14:00 |
| Type: |  Cessna 152 |
| Owner/operator: | Dean International INC |
| Registration: | N94292 |
| MSN: | 15285643 |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 3782 hours |
| Engine model: | Lycoming O-235 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Broward County NW of Tamiami, FL -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Lakeland, FL (KLAL) |
| Miami, FL (KTMB) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The private pilot reported that, during the instructional flight to accumulate flight time, the airplane experienced a rough-running engine in cruise flight and that the engine subsequently experienced a total loss of power. The pilot tried to restart the engine to no avail. He then chose to conduct a forced landing to a road, during which the airplane touched down on soft, wet ground before reaching the road. It then nosed over and came to rest inverted.
During recovery of the airplane, large cracks were noted in the engine crankcase near the No. 2 cylinder. Disassembly of the engine revealed that the crankshaft was fractured at the No. 3 connecting rod journal and exhibited signatures consistent with extreme heat. The No. 3 connecting rod bolts fractured at the point where the nuts contacted the connecting rod. Each connecting rod nut had a flat-face side and a raised-lip side. As found, the nuts were oriented with the raised-lip side touching the connecting rod despite the engine manufacturer’s service instruction, which stated that "Nuts [were] to be assembled with flat face side touching the connecting rod." The caution associated with the orientation of the connecting rod nuts at installation stated that “the connecting rod bolt cannot be tightened correctly if the nut on the connecting rod is installed incorrectly.” The operator’s maintenance personnel likely installed the nuts incorrectly during an engine overhaul about 246 flight hours before the accident flight, which resulted in a loss of torque on the connecting rod’s nuts and the subsequent fracture of the connecting rod’s bolts and total loss of engine power.
Probable Cause: The loss of torque on the No. 3 connecting rod’s nuts, which resulted in the failure of the No. 3 connecting rod’s bolts and a subsequent total loss of engine power due to the operator's maintenance personnel’s improper installation of the connecting rod nuts.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=94292
Location
Images:
Photo: FAA
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Nov-2016 23:06 | Geno | Added |
| 14-Nov-2016 22:57 | Geno | Updated [Registration, Cn, Operator, Source] |
| 10-Apr-2019 12:35 | ASN Update Bot | Updated [Time, Operator, Nature, Departure airport, Destination airport, Source, Narrative, Accident report, ] |
| 10-Apr-2019 12:41 | harro | Updated [Departure airport, Destination airport, Source, Narrative, Photo] |
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