REDUCER

The MS21916D8-6 is a genuine Textron Aviation reducer supplied for use on the aircraft, with its precise function defined by the aircraft's parts data. It fits the Citation III, VI or VII, Citation X, Citation X+, and Premier Model 390. It carries an export classification of ECCN EAR99. Because the MS21916D8-6 is an original-equipment (OEM) part sourced directly from Textron Aviation, it matches the exact specification and placement called out in the aircraft's type design and maintenance data — assurance a generic substitute cannot offer. Across the Cessna Citation and Beechcraft Premier fleet, correctly identified factory parts like this keep every airframe consistent and configuration-correct. Supplied as a defined part in the manufacturer's catalog, its exact role is set by the aircraft's parts and maintenance data. OEM parts arrive to the specification the type design was certified against, preserving both airworthiness and the airframe's documented configuration. Genuine factory parts carry the documentation and traceability that maintenance and airworthiness records depend on — assurance a look-alike substitute cannot provide. Both the Cessna and Beechcraft lines are supported today by Textron Aviation, formed in 2014 to unite the two historic Wichita manufacturers with Hawker. Cessna's Citation line, launched with the Model 500 in the early 1970s, grew into the best-selling business-jet family in the world, spanning today from the light M2 to the super-midsize Longitude. To check availability, request a quote for MS21916D8-6 or browse more Cessna Citation and Beechcraft Premier parts on Flying411.