Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to certain Raytheon Aircraft Company (Raytheon) Beech Model C90 airplanes. This proposed AD would require you to inspect the left-hand (LH) and right-hand (RH) nacelle and spar assembly for the existence of rivets and would require you to install rivets if they do not exist or are the wrong size or type. This proposed AD is the result of Raytheon identifying several instances where rivets were either missing or were wrong size or type on these airplanes. The actions specified by this proposed AD are intended to correct the installation of rivets in the LH and RH nacelle and spar assembly. These rivets must be present and have the correct dimension in order to prevent reduced structural integrity, which could result in structural failure and possible loss of control of the airplane.