Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain transport category airplanes, identified above. This proposed AD would require installing a bonding jumper from the boost pump volute to the fuel tank structure, and related investigative/ corrective actions. This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent point-contact arcing or filament heating in the fuel tank, which, in the event of a short or ground fault inside the fuel tank, could result in a fuel tank explosion and consequent loss of the airplane.