8407.10.00.60 - Used or rebuilt

This classification covers spark-ignition reciprocating or rotary internal combustion piston engines specifically designed and intended for use in civil aircraft. These engines are characterized by their ignition system, which utilizes spark plugs to ignite the fuel-air mixture within the cylinders, and their construction as either reciprocating (piston moving back and forth) or rotary (rotor turning within a housing) engines. The crucial defining factor for this category is their exclusive application within the civilian aviation sector, encompassing aircraft such as commercial airliners, private jets, helicopters, and smaller propeller-driven planes used for non-military purposes.

This category is distinct from its sibling, "New," in that it specifically pertains to engines that have been previously used or have undergone a rebuilding process. While both fall under the umbrella of aircraft engines for civil use, this node focuses on the condition and history of the engine. The "New" classification would encompass engines manufactured and sold directly from the producer without prior operational use.

As this node is a leaf node, there are no further subcategories. Classification decisions within this HTS code will therefore hinge on confirming the engine's spark-ignition type, its reciprocating or rotary configuration, its suitability for internal combustion, and its intended application for civil aircraft. Verification of the engine's condition as "used or rebuilt" is the final determining factor to assign goods to this specific classification.