"The Supplier shall be responsible for ensuring that the Catia data provided to BT is a true representation of their design intent.The Supplier shall work to the BT procedure for CAD modelling and data exchange."The Supplier shall provide details of all interfaces between sub systems, brackets, fasteners and protected air spaces within the Goods. As a minimum the level of detail in the model shall include LRUs. This information shall be provided in the form of a 3D model.