Summary
We propose to adopt a new airworthiness directive (AD) for certain General Electric Company (GE) GE90-110B1 and -115B turbofan engines. This proposed AD was prompted by multiple events of a leaking variable bypass valve (VBV) actuator fuel supply tube. This proposed AD would require replacement of this VBV actuator fuel supply tube with a part eligible for installation. We are proposing this AD to prevent failure of the affected fuel supply tube, fuel leakage, engine fire, and damage to the airplane.