Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to supersede airworthiness directive (AD) 2015-22- 53 for Airbus Helicopters (Airbus) Model AS350B3 helicopters. AD 2015- 22-53 requires revising the rotorcraft flight manual (RFM) to perform the yaw load compensator check after rotor shut-down and to state that the yaw servo hydraulic switch must be in the "ON" position before taking off. Since we issued AD 2015-22-53, Airbus developed a modification of the ACCU TST switch. This proposed AD would retain the requirements of AD 2015-22-53 and require modifying the yaw servo hydraulic switch (collective switch) and replacing the ACCU TST button. The actions of this proposed AD are intended to address an unsafe condition on these products.