Description
The MS21209F4-25 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 Sovereign or Sovereign+. It carries an export classification of ECCN EAR99, weighs 0.01 lbs, and measures 0.45 (L) x 0.32 (W) x 0.32 (H) in.
Because the MS21209F4-25 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.
Because the Cessna Citation aircraft share extensive structure and hardware, a single part like this is often common across several variants.
As a factory-supplied item for a type-certificated aircraft, this part is defined by the manufacturer's specification and applicability data. Using the factory part number preserves configuration control, so the airframe stays consistent with its approved type design and the work is straightforward to sign off at inspection.
On a certificated airframe, part provenance matters as much as the part itself; genuine factory sourcing settles that question up front.
Cessna traces to the company Clyde Cessna founded in Wichita, Kansas in 1927; Textron Inc. acquired it in 1992, and since 2014 it has anchored Textron Aviation alongside Beechcraft and 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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