CLAMP

The MS21920-57R is a genuine Textron Aviation clamp used to fasten, secure, or retain components during assembly of the airframe. It is applicable to the Citation CJ4, CJ4 Gen 2, CJ4 Gen 3 and Citation Mustang. It carries an export classification of ECCN 9A991. Supplied directly by Textron Aviation as an original-equipment (OEM) part, the MS21920-57R meets the manufacturer's specification and keeps the aircraft configuration-correct, with clean traceability in the maintenance records. Because the Cessna Citation aircraft share extensive structure and hardware, a single part like this is often common across several variants. Fastening and retaining hardware may look simple, but grade, size, and finish are specified for the joint each secures — the correct part matters. On a certificated airframe, part provenance matters as much as the part itself; genuine factory sourcing settles that question up front. 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. An unapproved or surplus substitute can introduce fit, material, or paperwork problems that surface at the next inspection; the genuine part avoids that risk. 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. The Citation family is the best-selling line of business jets ever built, and more than 7,500 have been delivered worldwide. Request a quote for MS21920-57R or browse more Cessna Citation parts on Flying411.