Airworthiness Directives; MD Helicopters, LLC Helicopters

The FAA has issued a proposed airworthiness directive for certain M-D Helicopters models, requiring operators to visually inspect the main transmission coupling for cracks in the splines. According to the Federal Register, issued today, this follows a report of mechanical damage. If cracks are found, operators will need to replace the coupling. The directive affects several M-D Helicopters variants including the three sixty-nine and five hundred-N series.

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