NTSB

The pilot’s failure to fly the published instrument approach, which resulted in a collision with mountainous terrain. Factors were the air traffic controllers’ failure to provide known information that may have assisted the pilot in determining whether to continue with the approach or take alternate action.

The decision to perform a negative G maneuver, which resulted in a loss of engine power due to fuel starvation.

The pilot’s inadequate in-flight planning/decision and selection of the wrong runway and inadequate compensation for the gusting tail wind conditions, which resulted in a stall/mush and subsequent crash.

The pilot’s failure to verify security of the left engine cowling and its subsequent separation in-flight and collision with the vertical stabilizer, resulting in the loss of aircraft control.

The pilot’s inadvertent flight into adverse weather conditions, and his failure to maintain terrain clearance while maneuvering.

The unqualified person’s poor judgment and his failure to maintain clearance from power lines and trees while maneuvering for a landing that resulted in the in-flight collision with trees and power lines.

Loss of engine power due to improper installation of the mixture control cable by maintenance personnel.

The failure of the muffler, resulting in a carbon monoxide leak into the cabin, rendering the pilot incapacitated, and the subsequent uncontrolled descent and impact with water.

The pilot’s inadequate in-flight planning and his failure to maintain aircraft control, resulting in an in-flight encounter with a thunderstorm and exceeding the design limits of the aircraft.