Summary
We propose to adopt a new airworthiness directive (AD) for Eurocopter France Model EC 155B, EC155B1, SA-366G1, SA-365N, SA-365N1, AS-365N2, and AS 365 N3 helicopters, which would require modifying the fuel tank draining system. This proposed AD is prompted by a closed fuel tank drain that, in the event of a fuel leak, could result in fuel accumulating in an area containing electrical equipment. The proposed actions are intended to prevent accumulation of fuel in an area with electrical equipment or other ignition source, which may lead to a fire.