ASN Wikibase Occurrence # 155213
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| Date: | Monday 15 April 2013 |
| Time: | 09:45 |
| Type: |  Beechcraft N35 Bonanza |
| Owner/operator: | Private |
| Registration: | N9414Y |
| MSN: | D-6592 |
| Year of manufacture: | 1960 |
| Total airframe hrs: | 6266 hours |
| Engine model: | Continental IO-520-BA(6) |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near Warren Municipal Airport - 3M9, Warren AR -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Warren, AR (3M9) |
| Mena, AR (MEZ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that the engine lost power during the initial climb. He then established a glide in an attempt to return to the airport; however, due to "strong" wind, the airplane landed "abruptly short of the runway." A postaccident engine examination revealed that the crankshaft had fractured due to fatigue through the No. 3 cheek immediately aft of the No. 2 main bearing journal. Portions of the saddle bore diameter at the nose of the crankshaft were oversized. The crankcase No. 2 main bearing saddle exhibited longitudinal deformation adjacent to the bore with fretting and galling on the saddle landings. The No. 1 main bearing shells were deformed; the No. 2 main bearing shells were worn, deformed, and partially split. The remaining bearings exhibited helical lines that matched the machining lines on the crankcase main bearing saddles. The tin coating had been worn away except around the oil transfer holes. The appearance of the main bearing shells was consistent with the bearings shifting during operation due to insufficient crush, which was likely caused by the oversized main saddle bore diameters. Maintenance records indicated that the engine was disassembled about 15 months before the accident due to a propeller strike. At that time, maintenance personnel cut the crankcase mating surfaces and resized the saddle bores. The engine had accumulated about 16.5 hours since the engine was reinstalled. It is likely that maintenance personnel improperly resized the saddle bores during the engine maintenance.
Probable Cause: The fatigue failure of the engine crankshaft due to oversized crankcase saddle bores, which resulted from maintenance personnel improperly resizing the saddle bores during engine maintenance.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=9414Y
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Apr-2013 05:19 | Geno | Added |
| 19-Apr-2013 10:19 | RobertMB | Updated [Aircraft type] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 14:32 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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