Summary
We propose to adopt a new airworthiness directive (AD) for Eurocopter Deutschland GMBH (Eurocopter) Model MBB-BK 117C-2 helicopters. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The European Aviation Safety Agency for the Republic of Germany, with which we have a bilateral agreement, states in the MCAI:
During inadvertent operation of the fire extinguishing system, in one case it occurred that one of the two injection tubes became disconnected. This condition, if not corrected, could affect the ability of the fire extinguishing system to perform its intended function in the case of activation.
The inability of the fire extinguishing system to suppress an engine fire creates an unsafe condition. The proposed actions are intended to address this unsafe condition by further securing the injection tubes with improved clamps, allowing suppression of a contained engine fire, and preventing an uncontained engine fire and subsequent loss of the helicopter.