What happened
The aircraft was engaged in an aerial observation flight when it experienced an in-flight breakup. Upon arrival at the accident site, investigators observed that the right wing had separated from the main airframe prior to impact with the ground.
The investigation
A detailed examination of the wreckage and remaining components was conducted to determine the sequence of events. Investigators focused on the structural integrity of the wing attachment points. They discovered that the fitting connecting the right wing strut to the fuselage was missing a nut. This specific nut is required to secure the fitting firmly to the airframe.
Findings
The absence of this critical fastener allowed the right wing strut to detach from the fuselage during flight operations. The loss of structural support led directly to the separation of the right wing and the subsequent breakup of the aircraft in mid-air. The primary failure was mechanical, resulting from the missing hardware rather than material fatigue or external damage.
Safety message
This incident highlights the critical importance of thorough pre-flight inspections and maintenance procedures. Ensuring that all structural fasteners, particularly those securing wing attachments, are present and properly torqued is essential for flight safety.