Turbofan, turboprop, piston, and other aircraft powerplants — along with their component parts — occupy a specialized niche where FAA Parts Manufacturer Approval (PMA) and airworthiness directives govern what may legally be installed on a certificated aircraft. Engine cores and high-pressure turbine components are frequently subject to ITAR controls when they incorporate military-grade technology, requiring export licenses even for repair-and-return shipments. The aftermarket for aircraft engine parts is substantial, and distinguishing new, overhauled, and serviceable-used parts at entry is essential for both duty and airworthiness compliance.

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