Airworthiness Directives; Airbus Model A300 B2; A300 B4; A300 B4-600, B4-600R, and F4-600R (Collectively Called A300-600); A310; A319; A320; A321; A330; and A340 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A300 B2; A300 B4; A300 B4-600, B4- 600R, and F4-600R (collectively called A300-600); A310; A319; A320; A321; A330; and A340 series airplanes, that requires replacement of Labinal actuators in certain powered cockpit seats with new improved actuators. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil aviation authority. The actions specified by this AD are intended to prevent uncommanded horizontal movement of the cockpit seats or loss of ability to lock the seats in place during flight, which could limit the ability of the crew to perform necessary tasks, leading to reduced controllability of the airplane.