Airworthiness Directives; British Aerospace Model BAe 146-100A, - 200A, and -300A Series Airplanes

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 96-14-09 that was sent previously to all known U.S. owners and operators of British Aerospace Model BAe 146-100A, -200A, and -300A series airplanes by individual notices. This amendment supersedes a previously issued AD that currently requires installation of a placard prescribing special procedures to be followed when operating at certain flight levels with the engine and airframe anti-ice switch ON; modification of the air brake auto-retract function; and a revision to the Airplane Flight Manual (AFM) to include special procedures for operating in certain icing conditions. This new amendment adds a requirement to accomplish an additional revision to the AFM relative to altitude and operating limitations associated with flight in icing conditions above 26,000 feet. This amendment is prompted by reports of uncommanded engine thrust reductions (rollback) when operating in certain icing conditions that exist in the vicinity of thunderstorms. The actions specified by this AD are intended to prevent engine power rollback during flight in icing conditions, a condition that could result in insufficient power to sustain flight.