Transport i lotnictwo · 26.09.2005

Airworthiness Directives; Boeing Model 747 Airplanes

The FAA proposes to supersede two existing airworthiness directives (ADs), one AD applicable to all Boeing Model 747 airplanes and the other AD applicable to certain Boeing Model 747 airplanes. The first AD currently requires repetitive inspections for cracking of the upper skin of the horizontal stabilizer center section and the rear spar upper chord, and repair if necessary. The other AD currently requires repetitive inspections for cracking of the upper skin of the outboard and center sections of the horizontal stabilizer and the rear spar structure, hinge fittings, terminal fittings, and splice plates; and repair if necessary. This proposed AD would add, for certain airplanes, repetitive inspections for cracking of the outboard and center sections of the horizontal stabilizer and repair if necessary. For certain other airplanes, this proposed AD would add a detailed inspection to determine the type of fasteners, related investigative actions, and repair if necessary. This proposed AD also would revise the compliance times for certain inspections and add alternate inspections for cracking of the upper skin of the center section and rear spar upper chord. This proposed AD is prom