Mountain Ridge Takeoff Results in Wing Strike and Landing Gear Collapse

Casualties unknown • Tok, AK, US

During a Part 135 air taxi departure from a narrow, remote ridge, crosswinds pushed the aircraft into a tree, causing structural damage to the right wing and collapse of the left main landing gear.

What happened

A commercial pilot was conducting a Part 135 cross-country air taxi flight, departing from a remote mountain ridge. The takeoff area was extremely confined, measuring approximately 500 feet in length and only 15 feet in width. The pilot initiated the departure downhill with a 10 mph quartering tailwind.

Approximately 250 feet from the starting point, a crosswind pushed the airplane to the right. This drift caused the right wing to collide with a tree. Following the impact, the airplane veered further to the right, resulting in the collapse of the left main landing gear. The aircraft sustained structural damage to the right wing.

The investigation

The pilot reported the sequence of events during the departure. No mechanical failure was cited prior to the collision. The primary factors were the confined takeoff area and wind conditions.

Findings

The accident occurred due to crosswind effects during a difficult mountain ridge departure. The limited space and terrain constraints contributed to the inability to maintain directional control after lift-off.

Probable cause

The pilot's failure to maintain aircraft control during takeoff in crosswind conditions on a confined, remote mountain ridge.

Frequently asked questions

What happened in the 2006-08-16 Piper PA-18 accident near Tok, AK?

During a Part 135 air taxi departure from a narrow, remote ridge, crosswinds pushed the aircraft into a tree, causing structural damage to the right wing and collapse of the left main landing gear.

What aircraft was involved and where did it happen?

The accident on 2006-08-16 involved a Piper PA-18, registration N8597D, operated by Forty Mile Air Ltd., at Tok, AK.

What was the probable cause of the accident?

The pilot's failure to maintain aircraft control during takeoff in crosswind conditions on a confined, remote mountain ridge.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20060911X01326. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.

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