AD 2013-20-51
Effective 10/25/2013 · Published 10/25/2013
Airworthiness Directives; AgustaWestland S.p.A. (Agusta) Helicopters
Summary
We are adopting a new airworthiness directive (AD) for Agusta Model A109A, A109A II, A109C, A109E, A109K2, A109S, AW109SP, A119, and AW119 MKII helicopters. The emergency AD was sent previously to all known U.S. owners and operators of these helicopters. This AD requires, before further flight, inspecting certain Thomas coupling nuts on the tail rotor drive shaft line for a crack and replacing all the nuts if any nu…