Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to adopt a new airworthiness directive (AD) for the Agusta S.p.A. (Agusta) Model AB139 and AW139 helicopters with a certain wire strike protection system (WSPS) top cable cutter assembly installed. This proposed AD is prompted by a report of in-flight contact between the top cable cutter assembly and two main rotor (M/R) blades. This proposed AD would require reworking or replacing the top cable-cutter assembly to increase clearance between the WSPS and the M/ R blades. The proposed AD actions are intended to prevent damage to the M/R blades and subsequent loss of helicopter control.