Superseded. This AD was superseded by AD 2021-05-21. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2017-23-08
Effective 12/11/2017 · Published 11/24/2017
Airworthiness Directives; Agusta S.p.A. Helicopters
Summary
We are superseding Airworthiness Directive (AD) 2014-24-02 for Agusta S.p.A. (Agusta) Model AB139 and AW139 helicopters. AD 2014-24-02 required repetitively inspecting the main rotor (M/R) rotating scissors, removing certain lower half scissor spherical bearings (bearings) from service, and installing a special nut. This new AD revises the inspection requirements and requires replacing the bearings. This AD is promp…