How does the NOSE CARGO DOOR work on the BOEING 747 explained by CAPTAIN JOE

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Dear friends and followers, welcome back to my channel and to a great video about "THE UNIQUE NOSE CARGO DOOR" of the Boeing 747 Freighter.
I´m sure many of you have wondered how the nose cargo door is opened and closed. To a big misconception, it is not opened and closed hydraulically, it´s actually driven by a small electric motor, which drives to flexible shafts into a gearbox on either side of the nose. The gearbox then drives a large threaded rod which is attached to the fuselage and nose which then by turning pushes the door open or pulls it inwards for closing.
Once it´s in the closed position a so-called "pull-hook actuator" hooks onto the fuselage and pulls the nose tight. Once fully closed the hook triggers an electrical signal to sixteen equally spread out latch actuators, which are small electric motors, pushing/turning a bolt through it respective counterpart. Once through the "loop", the bolt presses an electric switch signalling the latch actuator annunciator panel that the latch is closed and locked.

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Your "Captain" Joe

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