Description
The 3940389-3 is a genuine Textron Aviation retainer used to fasten, secure, or retain components during assembly of the airframe. It is applicable to the Skyhawk and Skylane. It carries an export classification of ECCN 9A991, weighs 0.02 pounds, and measures 4.2 (L) x 4.2 (W) x 3.05 (H) Inches.
As an original-equipment (OEM) part supplied directly by Textron Aviation, the 3940389-3 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.
Across the Cessna Skyhawk and Skylane fleet, correctly identified factory parts like this keep every airframe consistent and configuration-correct.
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.
Fitting the correct factory part the first time avoids the rework, removal, and re-inspection that an incorrect or unapproved part can trigger. 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.
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. With over 44,000 built, the Cessna Skyhawk is the best-selling aircraft ever made and is still produced today.
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