8543.90.35.00 - Other

This HTS subcategory, 8543.90.35.00, encompasses "Other" assemblies and subassemblies for flight data recorders that do not fit into the more specific sibling category of printed circuit assemblies. These are complex components comprising two or more individual parts or pieces that have been fastened or joined together to form a functional unit intended for use within a flight data recorder. The key criterion for inclusion here is that the assembly or subassembly, while integral to a flight data recorder, is not primarily a printed circuit assembly itself.

To distinguish this category from its sibling, 8543.90.15.00, it is important to note that printed circuit assemblies consist of a board on which electronic components are mounted or connected. While such assemblies may be *part of* a larger subassembly classified under 8543.90.35.00, this subcategory is for the broader, often more mechanically integrated, collections of components that together form a functional part of a flight data recorder, but are not solely defined by their printed circuit board structure. Examples might include complex mechanical linkages, housing units with integrated sensors and wiring harnesses, or other multi-component functional units within the recorder.

As this is a leaf node within the HTS classification structure, there are no further subcategories. The classification of an item under 8543.90.35.00 will therefore depend on whether it meets the criteria of being an assembly or subassembly for flight data recorders, and specifically, that it is not classifiable as a printed circuit assembly. The ultimate function and purpose of the assembly within the flight data recorder are paramount for accurate classification.