Airworthiness Directives; Eurocopter France Model EC 155B Helicopters

This amendment adopts a new airworthiness directive (AD) for Eurocopter France (Eurocopter) Model EC 155B helicopters with certain SMD45H multi-functional displays. This action requires replacing the "AC" SMD45H multi-functional display interconnection board (interconnection board) of the affected displays with a "BC" interconnection board. This amendment is prompted by an incident of smoke in a cockpit caused by overheating of the interconnection board. The actions specified in this AD are intended to prevent an electrical discontinuity in the grounding plane inside the SMD45H multi-functional display, which can result in overheating of the interconnection board, smoke in the cockpit, and subsequent loss of control of the helicopter.