Aircraft crash near airport following flight plan cancellation

2 fatalities • Libby, United States of America • Landing (descent or approach)

A twin-engine airplane crashed into trees after the pilot cancelled an instrument flight plan and encountered low visibility during a night flight.

What happened

During a night flight approaching an airport from the south, the pilot of a twin-engine airplane cancelled the established instrument flight rules (IFR) flight plan approximately 7 miles from the destination. A local police officer observed the aircraft emerge from cloud cover at an altitude of roughly 500 feet above the ground. The aircraft was seen banking left over a nearby town before turning and disappearing back into the clouds.

While the officer noted that the airport itself had clear skies and visible stars, the surrounding area was dark and covered in snow. Although the aircraft's rotating beacon was active, the runway lighting remained unlit. Following an FAA alert, search efforts located the wreckage approximately two miles north of the airport about seven hours later. The aircraft had struck multiple trees on a downward slope, leaving a debris field spanning about 290 feet. There were no reported survivors from the crash.

Findings

An investigation into the airframe and engines found no mechanical failures or malfunctions that would have prevented the aircraft from operating normally. The investigation determined that the combination of low light, cloud cover, and 35 percent lunar illumination significantly limited the pilot's visual references. These environmental factors likely caused the pilot to become geographically disoriented, resulting in a failure to maintain the altitude necessary to clear the terrain. Additionally, while the pilot lacked a valid certificate at the time of the accident, records showed significant flight experience in both VFR and IFR conditions. It was also noted that the pilot's medical history included color blindness and specific limitations regarding night operations.

Probable cause

The pilot became geographically disoriented due to limited visual references in dark, cloudy conditions, leading to a failure to maintain altitude and a collision with terrain.

Frequently asked questions

What happened in the 2012-12-19 Beechcraft 100 King Air accident near Libby, United States of America?

A twin-engine airplane crashed into trees after the pilot cancelled an instrument flight plan and encountered low visibility during a night flight.

Were there any fatalities in the 2012-12-19 Beechcraft 100 King Air accident?

The accident was fatal, resulting in 2 fatalities.

What aircraft was involved and where did it happen?

The accident on 2012-12-19 involved a Beechcraft 100 King Air, registration N499SW, operated by Stinger Welding Inc., at Libby, United States of America.

What was the probable cause of the accident?

The pilot became geographically disoriented due to limited visual references in dark, cloudy conditions, leading to a failure to maintain altitude and a collision with terrain.

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