Airworthiness Directives; Boeing Model 747-200, -300, and -400 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-200, -300, and -400 series airplanes, that requires repetitive inspections to detect cracking of the front spar web of the center section of the wing, and repair, if necessary. This amendment is prompted by reports of fatigue cracking found in the front spar web. The actions specified by this AD are intended to prevent the leakage of fuel into the forward cargo bay, as a result of fatigue cracking in the front spar web, which could result in a potential fire hazard.