Socata TB-20 N3041Y accident near Happy Camp, California

Probable cause

The pilot’s inadequate preflight planning and decision to continue to operate under visual flight rules into instrument meteorological conditions, which resulted in an encounter with an embedded thunderstorm and rain showers and moderate to severe turbulence, which ultimately resulted in the loss of airplane control.

NTSB analysis

The non-instrument-rated pilot advised an air traffic controller that he was having trouble descending through clouds. At that point, the controller lost radio and radar contact with the pilot and airplane, respectively. Shortly thereafter, emergency services began receiving telephone calls regarding a possible airplane crash. A law enforcement helicopter could not respond due to the foggy and rainy weather conditions. The wreckage was located later that evening in a forested area. Satellite imagery around the accident time showed the development of an area of convection immediately over the accident site consistent with low topped thunderstorms, which were embedded within a low cloud cover. The accident airplane encountered instrument meteorological conditions when it was lost from radar contact. The flight likely also encountered heavy rain and moderate to severe turbulence associated with the embedded thunderstorms.

Text from the NTSB. Open the NTSB docket for WPR10LA259 for the full record.