Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to Raytheon Aircraft Company (formerly Beech Aircraft Corporation) 90, 100, 200 and 300 series airplanes. The proposed action would require inspecting gray, blue or clear Ethylene Vinyl Acetate (EVA) tubing near the co-pilot's foot warmer for collapse or deformity. If the tubing is collapsed or deformed, the proposed action would require replacing and re-routing the tubing. This EVA tubing is used on the pneumatic de-ice indicator lines and the pressurization control system pneumatic lines that provide vacuum to the outflow safety valves that depressurize the airplane. Several reports of collapsed EVA tubing prompted the proposed action. The actions specified by the proposed AD are intended to prevent a loss of vacuum to depressurize the airplane cabin, which could result in personal injury to the door operator; and to prevent malfunction of the de-ice indicator system, which could cause the pilot to immediately exit icing conditions.