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PART I-DESCRIPTIVE


     POWERED FLYING CONTROLS AND
     VARIABLE INCIDENCE TAILPLANE

     18.  Flying controls operation
     
     (a)  General

          The ailerons and elevator are power-operated. the power
          being supplied by hydraulic oil under pressure from the
          aircraft hydraulic system, through two manual selector
          cocks under the control of the pilot. Four hydroboosters
          each consisting of a jack body and piston rod are fitted,
          three in the aileron circuit and one in the elevator circuit.
          Two hydraulic valves are provided, one controlling the
          three aileron boosters and the other controlling the
          elevator booster.

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     (b)  Aileron power circuit

          In the aileron circuit the centre booster of the three
          operates an output lever which is connected to two
          aileron control rods. The other two boosters are situated,
          one adjacent to each control surface and connected
          through a linkage to the respective control rod. When

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