McDONNELL DOUGLAS
McDONNELL DOUGLAS Model MD-900 helicopters (Docket No. 98-SW-24-AD; Amendment 39-10989; AD 98-12-30) - publishes an AD previously sent to all known U.S. owners and operators of MD-900 helicopters by individual letters. This AD requires inspecting the main rotor upper hub assembly for cracks, and if...
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