Airworthiness Directives; The Boeing Company Airplanes

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes. This proposed AD was prompted by reports that additional areas of Boeing Material Specification (BMS) 8-39 flexible urethane foam were found during a routine inspection. This proposed AD would require an inspection for foam insulation on the dripshield above the overhead panel support structure and replacement if necessary. For certain airplanes, this proposed AD would also require replacement of foam insulation on the overhead panel support structure. We are proposing this AD to address the unsafe condition on these products.