NTSB Identification: CHI96LA136.
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Accident occurred Sunday, April 21, 1996 in MIDDLETON, WI
Probable Cause Approval Date: 07/03/1996
Aircraft: Cessna 172N, registration: N739BN
Injuries: 3 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
On final approach to runway 12, the pilot selected 30 degrees of flaps and maintained 65 knots indicated airspeed. The pilot used right aileron and opposite rudder on final. He said the airplane required constant adjustments to the flight controls to hold the extended centerline. He stated that his touchdown was a bit hard and left of centerline. The airplane exited the left side of the runway and nosed over after encountering soft mud. The pilot said that on the landing roll, he did not maintain directional control as aggressively as he did on final approach, and that he should have used less than 30 degrees of flaps. A weather station reported winds from 170 degrees at 13 knots with gusts to 18 knots.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: failure of the pilot to maintain directional control of the airplane during the landing, which resulted in an inadvertent ground swerve. Factors relating to the accident were: the gusty crosswind condition, the pilot's excessive lowering of flaps, and the encounter with soft terrain. Full narrative available
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