Description
The MS21209F4-10L is a genuine Textron Aviation insert supplied for use on the aircraft, with its precise function defined by the aircraft's parts data. It is fitted to the Citation CJ1 or CJ1+ and Premier Model 390. It carries an export classification of ECCN EAR99.
Because the MS21209F4-10L 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.
This is a cataloged factory part whose form, fit, and function are established by the manufacturer's approved data. OEM parts arrive to the specification the type design was certified against, preserving both airworthiness and the airframe's documented configuration.
Because aircraft parts are governed by strict airworthiness and traceability rules, fitting the OEM part rather than an unapproved equivalent keeps the installation eligible and the aircraft's records clean.
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.
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