B737NG flight control system - Aileron PCUs, input shaft and pogos 

Brief video showing the behavior of the aileron control system on a B737NG. The pilots inputs are reflected on the input shaft (white vertical shaft on the left of the screen) and this shaft transmits the commands to the four pogos and then to the two PCUs. The hydraulic power from the PCUs drives the quadrant (right of the screen) which in turn drives the cables do the ailerons.

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