On 21 Sep 2012, a PIPER PA-18-150 operated by ALSWORTH ANTHONY R was involved in an aviation accident near Port Alsworth, AK. No fatalities were reported. Investigators recorded the probable cause as: The pilot's loss of directional control during takeoff in gusting wind conditions from an off-airport site, which resulted in a collision with terrain and a nose over. This summary draws on records from NTSB; 12 related events involving the same aircraft type or operator are linked below.
A pilot departing from a mountain ridgeline in gusty wind conditions experienced a wing strike and subsequent nose-over after liftoff. The aircraft sustained substantial damage to both wings and the fuselage. No mechanical issues were reported.
Overview
A pilot conducting a takeoff from a mountain ridgeline in gusting wind conditions encountered an uncontrolled yaw and roll immediately after liftoff, resulting in the aircraft nosing over and coming to rest inverted.
Sequence of Events
The pilot reported initiating the takeoff with an estimated 5-10 knot headwind. During the liftoff, a gust of wind raised the right wing, causing the left wing to strike the ground. This impact pivoted the airplane to the left. After pivoting, the aircraft continued over the ridgeline, traveling downhill. It subsequently nosed over and came to rest in an inverted position.
Damage
The accident resulted in substantial damage to both wings and the fuselage. There were no reported mechanical problems with the airplane prior to the accident.
Contributing factors
Causes
PilotDirectional control — Not attained/maintained