AD FAA-2010-0806

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 2010-15-51, which was sent previously to all known U.S. owners and operators of Agusta S.p.A. (Agusta) Model A119 and AW119 MKII helicopters by individual letters. This AD requires, within 5 hours time-in-service (TIS), and thereafter at intervals not to exceed 50 hours TIS, removing the cover of each pilot and co-pilot control box assembly (control box) and inspecting each rotary variable differential transformer (RVDT) control gear locking pin (locking pin) for proper position. If a locking pin is recessed, extended, or missing, this AD requires replacing the control box before further flight. This amendment is prompted by a report that an RVDT locking pin that was installed on a Model AW119 MKII helicopter moved from its proper position, resulting in loss of connectivity of the pilot and co-pilot throttle controls. The actions specified by this AD are intended to prevent the RVDT locking pin from moving from its proper position, which could lead to loss of manual engine throttle control, and subsequent loss of control of the helicopter.