8407.10.00 - Aircraft engines

HTS 8407.10.00 specifically classifies spark-ignition internal combustion piston engines designed and intended for the propulsion of aircraft. This category encompasses engines that generate power through the ignition of a fuel-air mixture by a spark, commonly found in various types of aircraft, including airplanes and helicopters. The primary distinguishing feature is their dedicated application in aviation, differentiating them from marine engines (8407.20) or those used for vehicles in Chapter 87.

While this level focuses broadly on aircraft engines, it further subdivides to distinguish between engines intended for civil aircraft and those for other (e.g., military) applications. The subcategory 8407.10.00.90, "Other," would typically capture engines not exclusively designated for civil aviation, reflecting a more specific end-use classification. This detailed breakdown ensures accurate tariff application based on the engine's intended operational environment and regulatory compliance.