Boeing B75N1 accident near Lone Rock, Wisconsin, July 30, 1997
On July 30, 1997 at about 9:00 pm local time, a Boeing B75N1, registered N75939, was substantially damaged in an accident near Lone Rock, Wisconsin (Tri-County airport). It was a personal flight under general aviation rules (Part 91). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
a locked right brake which resulted in the pilot's inability to maintain direction control of the airplane during the landing roll.
Source: NTSB aviation accident database, copy made November 2, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- July 30, 1997 · about 9:00 pm local time · cases in 1997
- Place
- Lone Rock, Wisconsin · Tri-County · cases near this airport · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Boeing B75N1 · all B75N1s on the register
- Registration
- N75939 · registry record · serial 75-1266
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The pilot reported the airplane veered 'uncontrollably' to the right during the landing roll. The left wing contacted the ground and the airplane continued the turn until coming to rest on its nose 180 degrees opposite the direction of landing. Post accident inspection of the airplane revealed the crankcase breather tube was routed down the right main landing gear strut allowing oil residue to contaminate the brake system.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: commercial pilot
- Ratings: multi-engine land; single-engine land; instrument: airplane; rotorcraft: glider
- Flight time: 6,900 hours in all; 500 in this make and model; 50 in the last 90 days; 30 in the last 30 days; 6,800 as pilot in command
- Medical certificate: Class 3
- Seat: rear
The aircraft
- Last inspection: annual inspection
- Maximum gross weight: 3,200 lb
- Seats: 2
- Landing gear: fixed
- Engine: P&W 985-AN1 (piston); 0 hours total
The flight
- Departed from: OUN Norman OK at 11:30 am
- Destination: LNR
- Flight plan: not recorded
- Runway 27, 4,020 ft by 75 ft
Weather at the time
- Light: daylight
- Wind: from 110° at 5 knots
- Visibility: 10 statute miles
- Sky: scat at 4,000 ft
- Temperature: 81°F (27°C), dew point 55°F (13°C)
- Altimeter: 30.00 inHg
- Observation at 8:50 pm from LNR
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Connections how this case links to the rest of the register
- N75939 on the register today · the tail number may have moved to another aircraft since
- Boeing B75 Stearman Kaydet 257 registered today · the model family and its accident history
- Boeing 6,677 aircraft on the register
- Engine: P&W 985-AN1 1 aircraft carry this series today · as the NTSB recorded it
- Tri-County Regional · nearest airport
- University Of Oklahoma Westheimer Airport · departed from
- Accidents and incidents in Wisconsin 1,622 since 1982 · 226 in the last ten years
- Wisconsin 6,164 aircraft registered
The whole map of how records connect · these connections as data: /graph/accident/CHI97LA242.json.
The bigger picture in Aviation Analytics: accidents over time since 1982, by model, by phase of flight and conditions, by place and on the map.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text does not name anyone involved, its policy at this time. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.