Airworthiness Directives; Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes, that requires a one-time visual inspection to detect missing rivet heads or loose rivets of the applicable stringer-to-rib connections in the upper and lower wing skin, and repair, if necessary. In lieu of the one-time visual inspection or in addition to that inspection, the AD also requires replacement of certain rivets with certain new rivets in all applicable rib-to-stringer connections of the upper and lower wings. This amendment is prompted by reports of missing rivet heads at the rib-to- stringer connections of the upper and lower wing skin at stringers 5 and 6. The actions specified by this AD are intended to prevent reduced structural integrity of the wings that is caused by problems associated with missing and/or loose rivets.