8501.53.40.40 - For use in civil aircraft

This HTS category, 8501.53.40.40, specifically classifies multi-phase AC motors that fall within a defined power output range and are intended for use in civil aircraft. These motors are characterized by their alternating current operation and multi-phase design, indicating they utilize multiple synchronized alternating current sources for power. The crucial distinguishing factor for this code is their specific application: they must be designed and manufactured for incorporation into civil aircraft, meeting the stringent requirements and certifications associated with aerospace components.

This classification distinguishes itself from its sibling category, 8501.53.40.80 ("Other"), by the explicit requirement for aircraft use. While both categories cover multi-phase AC motors of an output exceeding 75 kW but under 149.2 kW, only those destined for civil aircraft applications are captured here. Motors of the same power rating but intended for industrial machinery, ground transportation, or other non-aircraft purposes would fall under the "Other" sibling category.

As this is a leaf node in the HTS, there are no further subcategories. Therefore, classification within this code relies solely on confirming the motor's multi-phase AC design, its output power rating (exceeding 75 kW but under 149.2 kW), and its explicit designation and suitability for use in civil aircraft. This ensures that specialized motors meeting aerospace standards are correctly identified and accounted for within the tariff system.