Airworthiness Directives; Boeing Model 747 and 767 Series Airplanes Equipped With General Electric (GE) CF6-80C2 Engines

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 747 and 767 series airplanes, that currently requires revising the FAA-approved Airplane Flight Manual (AFM) to prohibit the use of certain fuels; and either replacing the existing placard on the door of the fueling control panel with a new placard, or replacing all dribble flow fuel nozzles (DFFN's) with standard fuel nozzles, which terminates the requirements for a placard and AFM revision. This amendment continues these requirements and adds additional airplanes to the applicability. This amendment is prompted by a report of an engine flameout due to the use of JP-4 or Jet B fuel during certification testing on an engine with DFFN's installed. The actions specified in this AD are intended to prevent such engine flameouts and consequent engine shutdown.