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 October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- July 30, 1997 · about 9:00 pm local time
- Place
- Lone Rock, Wisconsin · Tri-County · 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.
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 never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.