Airworthiness Directives; Bombardier Model DHC-8-301 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Bombardier Model DHC-8-301 series airplanes. This action requires removal of the access panels of the upper wings to determine the manufacturing date of the panels to verify compliance with Model 301 wing specifications, and corrective action, if necessary. This action is necessary to find and fix panels that do not meet such specifications, which could result in elongation of the attachment holes in the panels due to critical design loads, and consequent reduced structural integrity of the wings. This action is intended to address the identified unsafe condition.