Airworthiness Directives; Construcciones Aeronauticas, S.A. (CASA), Model C-212 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to all CASA Model C-212 series airplanes, that requires rework of the nose landing gear (NLG); modification of the hydraulic steering system; a test of the cable tension for the nosewheel steering system when abnormal vibration occurs, and adjustment of the cable tension, if necessary; and a revision to the Limitations section of the airplane flight manual to include certain procedures to be performed during the takeoff run. This action is necessary to prevent failure of the auxiliary landing gear direction system, which could result in abnormal vibrations during takeoff and landing runs, and consequent reduced controllability of the airplane. This action is intended to address the identified unsafe condition.