2.2.1.4 Pneumatic interfacesAny pneumatic interface required shall be explicitly approved by Bombardier during the engineering phase. The interfaces shall be part of a Pneumatic Diagram2.2.2 ElectricalThis section shall only be read and adhered to by the Supplier if the scope of supply includes electrical elements.2.2.2.1 Components, Printed Circuit Boards and AssembliesA List of Electrical Components such as relays, circuit breakers, terminal blocks, switches, wires, connectors, contactors etc. shall be submitted to BT for approval in Schematics, Interface Circuit diagram. To support this, data sheets shall be included.