Propellers for fixed-wing aircraft and rotor assemblies for helicopters — along with their blades, hubs, pitch-change mechanisms, and other dedicated parts — are precision aerospace components subject to FAA Parts Manufacturer Approval (PMA) or type-certificate holder authorization requirements when used in certificated aircraft. The distinction between a complete propeller assembly and individual blade or hub components matters for both classification and airworthiness documentation purposes. Composite-blade propellers for turboprop regional aircraft and variable-pitch propeller systems for business aviation represent the higher-value end of this trade. Importers should verify that each part carries the appropriate FAA-approved or accepted documentation, as unapproved parts can result in both customs and airworthiness enforcement actions.

AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.