Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 777-300ER and 777F series airplanes. This proposed AD was prompted by an evaluation by the design approval holder (DAH) indicating that the fuselage stringers, stringer splices, and skin splice straps are subject to widespread fatigue damage (WFD). This proposed AD would require repetitive detailed inspections of certain stringer splices and skin splice straps for any cracks, repetitive high frequency eddy current (HFEC) inspections of certain stringers and stringer splices for any cracks, and applicable on-condition actions. The agency is proposing this AD to address the unsafe condition on these products.