88033000 under HS Code PARTS OF GOODS OF HEADING 8801 OR 8802 - - OTHER PARTS OF AEROPLANES OR HELICOPTERS, 40169390 under HS Code OTHER ARTICLES OF VULCANISED RUBBER OTHER THAN HARD RUBBER - OTHER : GASKETS, WASHERS AND OTHER SEALS : OTHER, and 73182200 under HS Code SCREWS, BOLTS, NUTS, COACH-SCREWS, SCREW HOOKS, RIVETS, COTTERS, COTTER-PINS, WASHERS (INCLUDING SPRING WASHERS) AND SIMILAR ARTICLES, OF IRON OR STEEL - NON-THREADED ARTICLES : OTHER WASHERS were the top imported HS Codes by AVIATION IMPORT EXPORT JOINT STOCK COMPANY in 2021.