On October 30, 2004, a Piper PA-22-160 (registration N8158D) was involved in an aviation accident near Vacaville, CA. Investigators recorded the probable cause as: The pilot's failure to maintain directional control during the landing rollout, which resulted in the aircraft veering off the runway and nosing over after encountering soft terrain. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
The airplane veered off the runway during landing rollout and nosed over after encountering soft, muddy terrain.
What happened
The aircraft departed the paved surface while conducting a landing rollout. According to the pilot's account, directional control was lost immediately following touchdown. The airplane began to drift toward the right side of the runway. As it continued off the runway surface, the main landing gear encountered soft, muddy terrain. This interaction with the uneven ground caused the aircraft to pitch forward and nosed over.
The investigation
The investigation focused on the mechanical condition of the aircraft and the circumstances surrounding the loss of control. No pre-impact mechanical failures were identified that would have contributed to the event. The primary factor was the pilot's inability to maintain directional control during the critical phase of landing rollout.
Probable cause
The pilot's failure to maintain directional control during the landing rollout, which resulted in the aircraft veering off the runway and nosing over after encountering soft terrain.