Airworthiness Directives; Boeing Model 757 Series Airplanes Equipped with Pratt & Whitney Engines

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 757 series airplanes, that currently requires repetitive inspections to detect cracking in the midspar fuse pins and replacement of certain fuse pins. This amendment requires inspection of certain fuse pins, and replacement of certain fuse pins with certain other fuse pins. This amendment also requires inspections of refinished straight fuse pins and replacement of cracked refinished straight fuse pins with certain other straight fuse pins. This amendment is prompted by the development of new corrosion- resistant steel fuse pins. The actions specified by this AD are intended to prevent cracking of the midspar fuse pins, which may lead to separation of the strut and engine from the wing of the airplane.