88033000 under HS Code PARTS OF GOODS OF HEADING 8801 OR 8802 - - OTHER PARTS OF AEROPLANES OR HELICOPTERS, 40169320 under HS Code OTHER ARTICLES OF VULCANISED RUBBER OTHER THAN HARD RUBBER - OTHER : GASKETS, WASHERS AND OTHER SEALS : RUBBER RINGS (O-RING), and 84819090 under HS Code TAPS, COCKS, VALVES AND SIMILAR APPLIANCES FOR PIPES, BOILER SHELLS, TANKS, VATS OR THE LIKE, INCLUDING PRESSURE-REDUCING VALVES AND THERMOSTATICALLY CONTROLLED VALVES - PARTS : OTHER were the top imported HS Codes by AMT AVIATION SERVICES in 2021.