Airworthiness Directives; Gulfstream Model G-1159 (G-II), G-1159A (G-III), and G-1159B (G-IIB) Series Airplanes

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This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Gulfstream Model G-II, G-III, and G-IIB series airplanes. This proposal would require a one-time inspection to detect corrosion of the material layers of the lower aft fuselage skin in Fuselage Station (FS) 580 bulkhead assembly, and repair, if necessary. The proposal also would require modification of the aft fuselage area and various follow-on actions. This proposal is prompted by reports of varying levels of corrosion in the structure at FS 580. The actions specified by the proposed AD are intended to prevent the retention of moisture in the fuselage structure, and subsequent corrosion in FS 580 bulkhead assembly, which could result in reduced structural capability of the skin joint and resultant depressurization of the airplane.