This Tariff Concession Order (made under s269P of the Customs Act 1901) declares that certain parts for ammonia production plants — either a secondary reformer burner assembly or a burner — are to be treated under item 50 in Part III of Schedule 4 of the Customs Tariff Act 1995, effective 13 December 2010 and continuing until revoked (ss269SC/269SD). A customs delegate decides the classification; importers lodging entries under tariff code 8479.90.00 will have their tariff treatment determined by the Schedule 4 item and must meet normal customs compliance.