8411.91.90.85 - Other

This HTS classification, 8411.91.90.85, covers "Other" parts for aircraft turbines, specifically those not covered by preceding subheadings. This category encompasses a broad range of components essential for the operation of turbojet and turbopropeller engines that are not explicitly enumerated elsewhere. Examples include specialized fasteners, seals, gaskets, damping devices, certain types of bearings, and other miscellaneous components that contribute to the overall functionality and structural integrity of aircraft turbine engines, provided they are not specifically classified under "Steel forgings" or other more precise descriptions.

Distinguishing this category from its sibling, 8411.91.90.81, is crucial. The sibling category specifically covers "Steel forgings" used in aircraft turbines. Therefore, 8411.91.90.85 is reserved for those parts of aircraft turbines that are **not** made from steel forgings and are not otherwise specifically classified. Classification within this residual category requires careful consideration to ensure that a more appropriate, specific subheading does not exist.

As this is a leaf node, there are no further subcategories to introduce. Classification ends at this level. Therefore, the focus for proper classification under 8411.91.90.85 is on confirming that the imported part is indeed a component of a turbojet or turbopropeller engine, is not a steel forging (which would fall under the sibling category), and does not fit into any other more specific part description within the broader 8411 heading.