UNION

The MS21924J4 is a genuine Textron Aviation union supplied for use on the aircraft, with its precise function defined by the aircraft's parts data. It is applicable to the Citation CJ4, CJ4 Gen 2, CJ4 Gen 3, Citation III, VI or VII, Citation X, Citation X+, and Premier Model 390. It carries an export classification of ECCN 9A991. As an original-equipment (OEM) part supplied directly by Textron Aviation, the MS21924J4 is built to the aircraft maker's specification and cross-references the type design as documented in the maintenance data. Choosing the genuine part over an unapproved substitute preserves configuration control and simplifies inspection sign-offs. Parts like this are shared across the Cessna Citation and Beechcraft Premier aircraft, reflecting how much structure and hardware these models have in common. As a factory-supplied item for a type-certificated aircraft, this part is defined by the manufacturer's specification and applicability data. OEM parts arrive to the specification the type design was certified against, preserving both airworthiness and the airframe's documented configuration. Because substitutions on type-certificated aircraft require approved data, the genuine part is the straightforward, compliant choice for this application. 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. Request a quote for MS21924J4 or browse more Cessna Citation and Beechcraft Premier parts on Flying411.