This Tariff Concession Order declares a specific gearbox (Customs classification 8483.40.90) to be covered by the concession in Part III of Schedule 4 to the Customs Tariff Act 1995 (Item 50). It took effect 8 March 2011 and continues until formally revoked under sections 269SC or 269SD of the Customs Act 1901. Mechanically, importers of the described gearbox can claim the reduced/zero duty associated with that Schedule item, but must meet the product description and tariff classification and face administrative revocation risk (s269P; s269SC; s269SD; Part III, Sch 4, item 50).