Aircraft impact in mountainous terrain during return to departure airport

Casualties unknown • Port Alsworth, AK, US

A commercial flight involving six passengers encountered severe turbulence and windshear, resulting in a crash into tree-covered terrain.

What happened

A commercial pilot was conducting a cross-country flight under Part 91 regulations with six passengers on board. Shortly after taking off to the north, the aircraft encountered moderate and occasionally severe turbulence. In response to the weather conditions, the pilot decided to return to the departure airport by executing a right turn toward an area characterized by mountainous terrain.

During this maneuver, the wind increased significantly from the northeast. A series of strong downdrafts and associated windshear pushed the aircraft into tree-covered terrain. The impact caused the left wing to be severed from the fuselage. Following the collision, the aircraft pivoted 180 degrees and came to rest in a nose-high position.

The investigation

The investigation noted that the aircraft sustained substantial damage to its wings, fuselage, and empennage. According to the pilot, there were no mechanical problems with the airplane prior to the impact.

Probable cause

The occurrence was caused by strong downdrafts and windshear encountered during a turn toward mountainous terrain.

Frequently asked questions

What happened in the 2006-10-09 Piper PA-32-260 accident near Port Alsworth, AK?

A commercial flight involving six passengers encountered severe turbulence and windshear, resulting in a crash into tree-covered terrain.

What aircraft was involved and where did it happen?

The accident on 2006-10-09 involved a Piper PA-32-260, registration N996PK, at Port Alsworth, AK.

What was the probable cause of the accident?

The occurrence was caused by strong downdrafts and windshear encountered during a turn toward mountainous terrain.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20061011X01499. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.

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