Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all Airbus Helicopters Model AS350B3, AS355F, AS355F1, AS355F2, AS355N, AS355NP, EC130B4, and EC130T2 helicopters. This proposed AD was prompted by a report of the loss of the tightening torque between the upper ball bearing end and a main rotor (MR) servo-control. This proposed AD would require an inspection of the nut tightening torque of the upper ball bearing end of all the MR servo-controls and, depending on the results, corrective actions. The proposed AD would also require reporting the inspection results. The FAA is proposing this AD to address the unsafe condition on these products.