Mechanically, this Order declares that two parts of wind‑turbine power generators—gearboxes and yaw gears (classified at 8483.40.90)—are goods to which item 50 of Part III of Schedule 4 to the Customs Tariff Act 1995 applies, effective 8 Sept 2005 until revoked. It affects importers, suppliers and customs officials by changing the tariff treatment those parts receive under the Customs Tariff Act; the declaration was made by a delegate under section 269P of the Customs Act 1901, with revocation governed by sections 269SC/269SD.