ASN Wikibase Occurrence # 295357
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| Date: | Wednesday 20 August 2003 |
| Time: | 09:15 LT |
| Type: |  Boeing-Stearman A75 |
| Owner/operator: | Schwan's Aerial Marketing, LLC |
| Registration: | N806RB |
| MSN: | 75-4000 |
| Total airframe hrs: | 11673 hours |
| Engine model: | Pratt & Whitney R-985 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | La Crosse, Wisconsin -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Milwaukee-Lawrence J Timmerman Airport, WI (KMWC) |
| La Crosse Municipal Airport, WI (LSE/KLSE) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane sustained substantial damage when it nosed over during a forced landing to a cornfield after a total loss of engine power. The pilot reported the engine "suddenly began vibrating." The engine seized and the propeller stopped turning 10 seconds after the vibration started. He executed a forced landing to a cornfield, and the airplane nosed over during landing roll. The inspection revealed that the crankshaft was fractured in two pieces, with the fracture between the crankshaft rod journal and the front main bearing. Fatigue stress crack progression was observed on approximately 50 percent of the fracture surface. The cracking appeared to originate in the forward radius of the master-rod bearing journal. The remainder of the fracture surface exhibited conditions typical of tensile overload. The reason for the initiation of the crack in the journal radius of the crankshaft was not identified. The engine manufacturer's recommended time between overhaul (TBO) for the R-985 engine is 1,600 hours. The operator imposed a 1,200 hour TBO on the engines used in its fleet of airplanes.
Probable Cause: The total loss of engine power due to a fatigue fracture of the engine's crankshaft. A factor was the corn crop.
Accident investigation:
 |
|
Sources:
NTSB CHI03LA274
History of this aircraft
Other occurrences involving this aircraft
| 30 July 1997 | N450HP | Private | 0 | Dayton, TN | |
sub |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Oct-2022 07:33 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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