Airworthiness Directives; Agusta S.p.A. Model A109C, A109E, and A109K2 Helicopters

This document supersedes Airworthiness Directive (AD) 2001-24- 07 R1 and adopts AD 2007-26-52, which was sent previously to all known U.S. owners and operators of Agusta S.p.A. (Agusta) Model A109C, A109E, and A109K2 helicopters by individual letters. This AD requires inspections for swelling, deformation, bonding separation, or a crack on each main rotor blade (MRB) with a certain tip cap installed, and if any of these conditions are found that exceed the prescribed limits, replacing the MRB before further flight. This amendment is prompted by a report of the in-flight loss of part of a tip cap. The actions specified in this AD are intended to prevent an increase in vibration of the MRB and subsequent loss of control of the helicopter.