Summary
This document proposes the supersedure of an existing airworthiness directive (AD), applicable to all Gulfstream Model G-159 (G-I) airplanes, that currently requires repetitive inspections to detect corrosion in the wing planks under the bottom wing center fairings, and repair, if necessary. This action would require the installation of a protective paint system which, when accomplished, will allow the inspections to be conducted at longer intervals. This action was prompted by the development of a modification that will improve the corrosion resistance of the subject area. The actions specified by the proposed AD are intended to detect and prevent corrosion in the lower skins of the wing center section. If corrosion in this area remains unchecked, it could reduce the integrity of the wing-to-fuselage fitting, and consequently could lead to separation of the wing from the airplane.