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Aircraft: Boeing 747-400 is inThe Boeing 747-300The variant is a modified and extended range variant of the 747-300. In 1985, the B747-400 program was officially launched, and new electronic instruments were installed. The 747-300 was changed from a three-person simulated cockpit to a two-person digital cockpitThe cockpitJust two digitsThe pilotFlight engineers are no longer needed to drive.

        The numberThe digital avionics and color multifunction displays are used in the digital cockpit, equipped with six large unitsCRTThe display screen replaces the traditional dashboard. Shape upper wingWing tipsLengthened 1.83 meters, and added 1.83 meters highTip winglet, reducing drag and increasing the range by 3% to 13,450 km. The wingtip winglets are also an obvious difference in shape from the 300. Use advanced aluminum alloy to make airfoil andThe landing gearA total weight loss of 3.5 tonsHorizontal stabilizerAdd fuel tank. A new engine was installed and the cabin interior was redesigned. The modified 747-400 has a longer range, higher fuel efficiency and lower noise and operating costs than previous 747 models. The 747-400 is available in passenger, passenger and cargo mix models and cargo models.

       The Boeing 747-400 made its first flight on 29 April 1988 and was delivered on 9 February 1989Northwest AirlinesPut into use. It was the only one in production after May 1990The Boeing 747Models. To 2007-400jetThe model has been discontinued, only the freighter model has been retained to continue production. By October 2007, 670 747-400 aircraft had been delivered.