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Instructor Greg Alston Abstract This paper examines the in-flight separation of the number two pylon and engine from a Boeing 747-121 shortly after takeoff from the Anchorage International Airport on March 31 1993 The safety issues discussed focus on the inspection of Boeing 747 engine pylons meteorological hazards to aircraft the lateral load-carrying capability of engine pylon structures and aircraft departure routes at Anchorage International Airport during turbulent weather conditions Shortly after noon on March 31 1993 the number two engine and pylon separated from Japan Airlines Inc flight 46E shortly after departure from the Anchorage International Airport The aircraft a Boeing 747-121 had been leased from Evergreen International Airlines Inc The flight was a scheduled cargo flight from Anchorage to Chicago-OHare International Airport On board the airplane was the flight crew and two nonrevenue company employees The airplane was substantialy damaged during the separation of the engine but no one on board the airplane or on the ground was injured Flight 46E departed Anchorage about 1224 local time The flight release and weather package provided to the pilots by Evergreen operations contained a forecast for severe turbulence As fight 46E taxied onto the runway to await its takeoff clearance the local controller informed the flight crew that the pilot of another Evergreen aircraft reported severe turbulence at 2500 feet while climbing out from runway 6R After takeoff at an altitude of about 2000 feet the airplane experienced an uncommanded left bank of approximately fifty degrees Although the desired air speed was 183 knots the air speed fluctuated from a high of 245 knots to a low of 170 knots Shortly thereafter the flight crew reported the number two throttle slammed to its aft stop the number two thrust reverse indication showed thrust reverser deployment and the number two engine electrical bus failed Several witnesses on the ground
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