Airworthiness Directives; Boeing Model 767 Series Airplanes

This amendment adopts a new airworthiness directive (AD) that is applicable to all Boeing Model 767 series airplanes. This action requires revising the Airplane Flight Manual (AFM) to include procedures that will ensure that the center tank fuel pumps are not operated with less than 1,000 pounds of fuel in the center tank. This amendment is prompted by a report indicating that a fuel pump failed due to damage to an impeller unit and pumping unit housing caused by a loose diffuser ring in the fuel pump assembly. The actions specified in this AD are intended to ensure the flight crew is advised of procedures that will ensure that the center tank fuel pumps are not operated with less than 1,000 pounds of fuel, which will prevent ignition of fuel vapors due to the generation of sparks and a potential ignition source inside the fuel tank caused by metal-to-metal contact during dry fuel pump operation.