Amateur-built CCK-1865 N56DV accident near Twisp, Washington

Probable cause

The pilot’s failure to see and avoid a rock during an aborted landing on a hillside, the collision with which resulted in damage to the aileron system that precluded subsequent control of the airplane.

NTSB analysis

The pilot planned on landing on an upsloping hillside and made two low passes, performing reconnaissance over the landing area. The airplane touched down on the slope and then, for unknown reasons, the pilot aborted the landing. The airplane became airborne again and collided with a large rock immediately ahead. The impact with the rock resulted in the airplane’s left landing gear folding under the fuselage and a portion of the airframe becoming deformed. The airplane continued flying and entered a gradual left turn, during which the pilot stated over the radio, “I’m flying, but I’m having problems.” The airplane subsequently collided with terrain.

Examination of the wreckage revealed evidence that, as a result of the damage sustained during the airplane’s impact with the rock, the aileron cable likely became captured in the pulley housing, prohibiting the pilot from being able to directionally control the airplane.

The pilot had baseline cognitive deficits that adversely affected problem-solving, adaptability, and impulse control, such that the FAA determined his medical certification to be incompatible with aviation safety; these deficits may have negatively influenced his decisions and performance during the flight. The pilot also had underlying heart disease; however, the circumstances of the accident did not indicate a sudden medical event, and it is unlikely that the pilot’s heart disease contributed to the accident.

Text from the NTSB. Open the NTSB docket for WPR24FA001 for the full record.