This Order (TCO 0921556) declares that specific parts for track‑laying machines — track link assemblies (with or without shoes/grousers) and track links — classified at 8431.49.90 are subject to item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995, effective 24 June 2009 (made under s.269P).
Mechanically, it changes the tariff treatment applied at import for those listed parts, affecting import costs and sourcing decisions by importers and manufacturers; the decision was made by a CEO delegate (Michael Perry) and may be revoked under ss.269SC–269SD, creating administrative discretion and a compliance requirement to match the goods to the description.