Airworthiness Directives; The Boeing Company Airplanes

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes. This AD was prompted by reports of severe corrosion on bonding jumpers installed on the flight control surfaces. This AD requires repetitive bonding jumper inspections for corrosion, sealant disbond, and insufficient sealant coverage; and corrective actions if necessary. This AD also specifies an optional inspection for corrosion damage of the bonding brackets, and corrective actions if necessary, which would terminate the repetitive inspections. For certain airplanes, this AD requires installing certain bonding jumpers, and replacing single-tabbed brackets with two-tabbed brackets. We are issuing this AD to detect and correct corrosion on bonding jumpers installed on the flight control surfaces, which, in the event of a lightning strike, could damage the actuator control electronics (ACEs) and result in the loss of the ability to command individual flight control surfaces or cause uncommanded motion of individual flight control surfaces.