An aerofoil for example a fan blade comprises a leading edge, a trailing edge, a concave pressure surface extending from the leading edge to the trailing edge and a convex suction surface extending from the leading edge to the trailing edge. The system includes methods for detecting a connection to a new network by receiving notice of, and evaluating, changes to an existing network configuration. Lite system is an exemplary system suitable for implementing the present invention because it includes at least one operational state and an idle state in which no data is transmitted.