Incident Overview

Date: Thursday 17 November 1994
Aircraft Type: Beechcraft 300LW Super King Air
Owner/operator: Executive Air
Registration Number: VH-KDV
Location: near Canobie, QLD – ÿ Australia
Phase of Flight: En route
Status: Substantial, repaired
Casualties: Fatalities: 0 / Occupants:
Component Affected: Left wingLeft wing
Investigating Agency: BASIBASI
Category: Accident
A pilot reported a left aileron buckle during pre-flight inspection of an aircraft. Subsequent inspection revealed diagonal wrinkling of the lower wing surface, leading edge movement in the wing attachment area, and evidence of wing movement. The pilot stated the aircraft had operated normally on the previous day with smooth flight and light turbulence during cruise. Analysis of the damaged aileron indicates a failure due to static overload under high speeds and gusts conditions, not reported by the pilot.A pilot reported a left aileron buckle during pre-flight inspection of an aircraft. Subsequent inspection revealed diagonal wrinkling of the lower wing surface, leading edge movement in the wing attachment area, and evidence of wing movement. The pilot stated the aircraft had operated normally on the previous day with smooth flight and light turbulence during cruise. Analysis of the damaged aileron indicates a failure due to static overload under high speeds and gusts conditions, not reported by the pilot.

Description

During the pre-flight inspection the pilot noticed that the left aileron was buckled. Further inspection revealed diagonal wrinkling of the lower surface of the left wing, the leading edge of the left wing outboard of the engine nacelle, and evidence of movement in the left wing attachment area. The pilot stated that when he flew the aircraft on the previous day it had handled normally. The weather conditions on that day were such that at cruise the flight was smooth with light turbulence during the descent. An analysis of the damaged aileron concluded that it had failed in static overload. An engineering assessment of the damaged to the aircraft concluded that the most likely scenario to cause the damage was one involving high speeds and gusts. These conditions were not reported by the pilot.

Primary Cause

Static overload caused by high speeds and gusts during cruise flight.Static overload caused by high speeds and gusts during cruise flight.

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