Special Conditions: Boeing Model 747-8/-8F Airplanes, Interaction of Systems and Structures

These special conditions amend Special Conditions No. 25-388- SC for the Boeing Model 747-8/-8F airplanes. These special conditions were previously issued July 29, 2009, and became effective September 10, 2009. These special conditions are being amended to include additional criteria addressing the Outboard Aileron Modal Suppression System. The 747-8/-8F will have novel or unusual design features when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. These design features include their effects on the structural performance. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards. Additional special conditions will be issued for other novel or unusual design features of the 747-8/-8F airplanes.