Airworthiness Directives; General Electric Company (GE) CF6-80C2B Series Turbofan Engines

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The FAA proposes to adopt a new airworthiness directive (AD) for GE CF6-80C2B series turbofan engines with electronic control units (ECUs), installed on Boeing 747 and 767 airplanes. This proposed AD would require installing software version 8.2.Q1 to the engine ECU, which increases the margin to engine flameout. This proposed AD results from reports of engine flameout events during flight, including reports of events where all engines simultaneously experienced a flameout or other adverse operation. We are proposing this AD to provide increased margin to flameout and to minimize the potential of an all-engine flameout event, due to ice accretion and shedding during flight.