Summary
We propose to adopt a new airworthiness directive (AD) for certain serial-numbered Eurocopter France (Eurocopter) Model AS332C1 and AS332L1 helicopters. This proposed AD would require replacing the rivets on the left-hand (LH) and right-hand (RH) Y350 longitudinal beams (longitudinal beams Y350). This proposed AD is prompted by a report that non-conforming rivets had been installed on an AS332 helicopter during a production modification. The proposed actions are intended to prevent failure of the longitudinal beams Y350 and subsequent loss of control of the helicopter.