# Accident 19970730020879A: Boeing B75N1, Lone Rock, WI, July 30, 1997

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: July 30, 1997
- Place: Lone Rock, WI
- Damage: Substantial damage
- Location: 43.1804° N, 90.2006° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=43.1804&lon=-90.2006&mi=10
- Aircraft: N75939, registered now (https://openairdocs.org/aircraft/N75939) (OpenAirDocs)
- Registry model: Boeing B75N1 (registry code 1380144, https://openairdocs.org/model/boeing-b75n1) (OpenAirDocs)
- Registry engine: Pratt & Whitney R-985 series (registry code 52008, https://openairdocs.org/engine/pratt-whitney-r-985-series) (OpenAirDocs)
- Reported make and model: BOEING B75N1
- Fatal injuries: 0
- NTSB investigation: [NTSB CHI97LA242](https://openairdocs.org/ntsb/CHI97LA242) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19970730020879A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

AIRCRAFT RIGHT BRAKE LOCKED CAUSING AIRCRAFT TO GROUND LOOP AND DAMAGE LOWER LEFT WING PANE. (-23) (HAYES BRAKES) R.H. BRAKE LINING WAS CONTAMINATED WITH OIL. THIS CONDITION WILL CAUSE BRAKES TO DRAG OR LOCK-UP.  CONTAMINATION WAS CAUSED BY A CRANKCASE VENT LINE ROUTED DOWN THE LANDING GEAR STRUT (EXPERIMENTAL MVD.)

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CHI97LA242](https://openairdocs.org/ntsb/CHI97LA242), Jul 30, 1997: Boeing B75N1 (N75939), Lone Rock, WI, substantial damage. Probable cause: a locked right brake which resulted in the pilot's inability to maintain direction control of the airplane during the landing roll.

## Other reports on N75939 (2)

Matched to the same aircraft by N-number and date.

- [Incident 19850518036409I](https://openairdocs.org/incident/19850518036409I), May 18, 1985: Boeing B75N1 (N75939), Frederick, OK, Minor damage. Bounced on landing and tail started to rise. Propeller struck ground and aircraft flipped onto its back.
- [Accident 19791101029949A](https://openairdocs.org/incident/19791101029949A), Nov 1, 1979: Boeing B75N1 (N75939), Crystal City, TX, Substantial damage. Forced landing due to failure of cam drive rivets.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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