9902.15.41 - Used compression-ignition internal combustion piston engines to be installed in vehicles of subheading 8701.20 or heading 8704 (provided for in subheading 8408.20.20)

This HTS classification pertains to used compression-ignition internal combustion piston engines specifically intended for installation in vehicles classified under subheading 8701.20 (used tractors for the building or civil engineering industry) or heading 8704 (motor vehicles for the transport of goods). The "provided for in subheading 8408.20.20" indicates that the underlying engine type falls under diesel or semi-diesel engines. This classification is temporary and falls under Chapter 99, which addresses temporary legislation and modifications related to trade agreements and agricultural import restrictions.

Distinguishing this category from its siblings is crucial. While other entries at the root level might deal with live animals, machinery, or other goods, this specific node is narrowly defined by the type of engine (used compression-ignition piston), its intended application (installation in specific vehicle types), and its temporary tariff treatment. It is not a general classification for all engines or all used engines, but rather a specialized provision for a particular set of circumstances and vehicle types.

As this is a leaf node within the HTS, there are no further subdivisions or subcategories. The classification is definitive for used compression-ignition internal combustion piston engines that meet the exact criteria outlined in the description and are imported under the conditions governed by Chapter 99. Importers must ensure that the engines are genuinely used, of the specified type, and destined for installation in the precise vehicle subheadings mentioned to qualify for this classification.