MD HELICOPTERS Model 500N, 600N and MD900 helicopters [Docket No. FAA-2012-0746; Directorate Identifier 2008-SW-035-AD; Amendment 39-17337; AD 2013-03-03] – requires determining the cure date for each NOTAR fan blade tension-torsion strap (T-T strap), establishing a calendar-time retirement life for...

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