Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Saab Model SAAB 340B airplanes. This proposal would require inspections to detect cracking of the beams located over the overwing emergency exits, and replacement of the beam with a new beam, if necessary. This proposal is prompted by a report that a batch of beams with cracking may have been installed on these airplanes. The actions specified by the proposed AD are intended to prevent cabin pressure leakage, consequent loss of cabin pressurization, and reduction of the load carrying capability of the associated structure, as a result of cracked beams.