8409.10.00 - For aircraft engines

HTS Code 8409.10.00 specifically classifies parts and accessories that are designed for use solely or principally with aircraft engines. This heading encompasses a wide array of components, such as engine mounts, fuel system parts, ignition system components, and other specialized engine parts that are integral to the operation of aircraft powerplants. The critical factor for classification under this heading is the explicit suitability and intended application for aircraft engines.

This category is distinct from its sibling category, "Other" parts for engines of heading 8407 or 8408. While the "Other" category would capture general engine parts not exclusively for aircraft, 8409.10.00 is narrowly focused on components whose design and construction are specifically tailored for aviation applications. This distinction ensures accurate tariff application based on the end-use and specialized nature of the parts.

To further refine classification within this category, subcategories exist. Subheading 8409.10.00.40 is reserved for parts intended for use in civil aircraft engines. The remaining parts, not specifically designated for civil aviation but still intended for aircraft engines (which could include military applications), fall under subheading 8409.10.00.80, denoted as "Other." This subdivision allows for more granular reporting and statistical tracking of different types of aircraft engine parts.