Summary
We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 747-8 and 747-8F airplanes. This proposed AD was prompted by an analysis, which determined that in a limited flight envelope with specific conditions, divergent flutter could occur during a high g-load maneuver in combination with certain system failures. This proposed AD would require replacing the lateral control electronic (LCE) modules, replacing the inboard elevator power control packages (PCPs), installing new external compensators for the PCPs, and revising the maintenance or inspection program. We are proposing this AD to prevent certain system failures from resulting in divergent flutter, and subsequent loss of continued safe flight and landing.