Primary finding
Probable cause
a locked right brake which resulted in the pilot's inability to maintain direction control of the airplane during the landing roll.
Investigator assessment
Analysis narrative
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.
Source record
Factual narrative
On July 30, 1997, at 1600 central daylight time (cdt), a Boeing B75N1, N75939, operated by a commercial pilot collided with the terrain following a loss of control while landing at the Tri- County Regional Airport, Lone Rock, Wisconsin. The airplane was substantially damaged. The pilot was not injured. Visual meteorological conditions prevailed and it is unknown if a flight plan was filed. The airplane departed from Norman, Oklahoma, at 0630 cdt. The pilot reported that during the landing roll the airplane veered "uncontrollably" to the right. During the turn the left wing contacted the ground. The airplane continued the turn until it came to rest on its nose, 180 degrees opposite the landing direction. Post accident inspection of the airplane by a Federal Aviation Administration Airworthiness Inspector revealed the crankcase breather tube was routed down the right main landing gear strut thus allowing oil residue to contaminate the right brake. -