Boeing A-75 N806RB
20 August 2003 · La Crosse, Wisconsin, United States · No injuries
Summary
On 20 August 2003 at about 15:15 local time, a Boeing A-75 registered N806RB was involved in an accident near La Crosse, Wisconsin, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 15:15
- Classification
- Accident
- Location
- La Crosse, Wisconsin, United States
- Nearest airport
- La Crosse Muni (LSE)
- Coordinates
- 43.8789, -91.2544
- Aircraft
- Boeing A-75
- Registration
- N806RB
- Category
- Airplane
- Engines
- 1
- Operator
- Not recorded
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Personal
- Phase of flight
- Not recorded
- Route
- Milwaukee → La Crosse
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- CHI03LA274
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
Probable cause
The total loss of engine power due to a fatigue fracture of the engine's crankshaft. A factor was the corn crop.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
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.
Quoted verbatim from the NTSB record.
Other Boeing A-75 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 21 Jul 2007 | Boeing A-75 | Spokane, Washington, United States | - | No injuries | - |
| 26 Jul 1999 | Boeing A-75-N1 (STEARMAN) | Tooele, Utah, United States | Thomas C. Lambrick | No injuries | - |
| 10 Sep 1992 | Boeing A-75 | Ottawa, Illinois, United States | Manley, John A. III | No injuries | - |
| 11 May 1991 | Boeing A-75 | Seattle, Washington, United States | Thomas H. O'leary | Minor injuries | - |
| 30 May 1991 | Boeing A-75 | Horseshoe Bend, Arkansas, United States | Dennis Dunlop | No injuries | - |
| 15 Jun 1989 | Boeing A-75 | Daytona Beach, Florida, United States | - | Fatal | 1 |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 13 Jun 2003 | New Standard D-25 | West Bend, Wisconsin, United States | - | No injuries | - |
| 14 Jan 2003 | Robinson R22B | Oshkosh, Wisconsin, United States | - | Minor injuries | - |
| 23 Aug 2003 | Cessna 150J | Fennimore, Wisconsin, United States | - | Minor injuries | - |
| 21 Nov 2003 | Piper PA-32-300 | Superior, Wisconsin, United States | - | No injuries | - |
| 22 Nov 2003 | Cessna 182R | Wausau, Wisconsin, United States | - | No injuries | - |
| 14 May 2003 | Piper J3C-65 | Wilmot, Wisconsin, United States | - | No injuries | - |