Transport i infrastruktura · 10/10/2012

Airworthiness Directives; The Boeing Company Airplanes

We propose to supersede two existing airworthiness directives (AD) that apply to certain The Boeing Company Model 737-100, -200, - 200C, -300, -400, and -500 series airplanes. The existing AD, for certain Model 737-100, -200, and -200C series airplanes currently requires repetitive inspections of the aft end of each inboard flap track of the wing outboard flap, and corrective actions, if necessary. The existing AD, for certain Model 737-100, -200, -200C, -300, -400, and -500 series airplanes requires repetitive inspections for cracks in the upper flange of the inboard track at the rear spar attachments of each outboard flap, and corrective action, if necessary. That AD also requires, for certain airplanes, repetitive inspections for discrepancies of the rear spar attachments and cracks in the upper flange of the inboard track at the rear spar attachment of each outboard flap, and eventual rework of the flap track assembly and rear spar attachments, including replacement of the flap track with a new track, if necessary. Since we issued those ADs, we have received reports that the work sequence and procedures used during track installation could also cause loose or cracked tracks. Th