Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain IAI Model 1125 Westwind Astra series airplanes. This proposal would require repetitive inspections to detect loose or damaged rivets that fasten a certain support beam to the frame of the fuselage; and modification of the attachment between the support beam and fuselage by installation of additional fasteners, if necessary. This proposal also would require the eventual accomplishment of this modification on all airplanes, which would terminate the repetitive inspections. This proposal is prompted by reports indicating that the attachment between this beam and the fuselage has become loose on several airplanes. Movement of this beam could restrict the movement of the elevator and rudder controls cab that run through the bellcranks attached to it. The actions specified by the proposed AD are intended to prevent movement of this beam, which could restrict movement of the elevator and rudder controls, and consequently lead to reduced controllability of the airplane.