Airworthiness Directives; The Boeing Company Airplanes

Riepilogo

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, -200LR, -300ER, and 777F series airplanes. This proposed AD was prompted by a report of a jettison fuel pump that was shut off by the automatic shutoff system during the center tank fuel scavenge process on a short-range flight. This proposed AD would require making wiring changes, modifying certain power panels, installing electrical load management system software, and accomplishing a functional test. We are proposing this AD to prevent extended dry running of the jettison fuel pumps, which can be a potential ignition source inside the main fuel tanks, and consequent fuel tank fire or explosion in the event that the jettison pump overheats or has an electrical fault.