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PART I-DESCRIPTIVE


     26.  Undercarriage emergency operation

     (a)  If electric or hydraulic failure occurs, the undercarriage
          may be lowered irrespective of the position of the normal
          selector button by pressing the emergency pushbutton (5)
          on the port shelf. This releases the air trapped in the
          main hydraulic accumulators, which in turn releases the
          "up" locks and applies pneumatic pressure to the jack
          pistons of the undercarriage units.
          
     (b)  If it is required to retract the undercarriage on the
          ground. the "up" selector button should be rotated
          clockwise and then pressed. It must never he so used
          when the aircraft is airborne otherwise damage may be
          caused to the wings.
          

     27.  Flaps/airbrakes control and position indicator

     (a)  The split trailing edge flaps. which also act as airbrakes,
          are selected electrically and operated hydraulically. They
          may be selected down at any speed but the amount to
          which they will lower depends upon the air loads. If
          speed is increased with the flaps extended, the air loads
          will reduce the flap angle.

     (b)  Control of the flaps is by an inching switch on the
          throttle lever in conjunction with a limit setting switch
          (22) on the instrument panel. Rearward movement of
          the inching switch lowers the flaps, forward movement
          raises them. When the inching switch is released it
          returns to the central (off) position and flap movement
          is arrested.
          
     (c)  The limit setting switch may be set to either:-
     
              (1)  TAKEOFF AND AIRBRAKES
              
           or (2)  LANDING

           When set to (1) the limit to which the flaps may be
           lowered is 35°. When set to (2) the limit is increased to
           50° (fully down).

32

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