Airworthiness Directives; Boeing Model 727 Series Airplanes

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 727 series airplanes. This action requires detailed inspections to detect cracking and corrosion of the upper chord of the rear spar of the wing; and repair, if necessary. This action also requires detailed inspections to detect and permanently repair any cracking that has been previously repaired by stop-drilling. This action is necessary to prevent failure of the wing and fuel leaks in the airplane due to stress corrosion cracking of the upper chord of the rear spar. This action is intended to address the identified unsafe condition.