Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters

This amendment adopts a new airworthiness directive (AD) that is applicable to Eurocopter France Model AS-350B, BA, B1, B2, and D helicopters, and Model AS 355E, F, F1, F2, and N helicopters. This action requires replacing certain tailboom attachment bolts located above the cargo compartment floor. This amendment is prompted by two reports of attachment bolts' strength properties not meeting design specifications during manufacture. The actions specified in this AD are intended to identify and remove the weaker bolts and to prevent the separation of the tailboom from the helicopter, and subsequent loss of control of the helicopter.