PART I-DESCRIPTIVE

          A voltmeter (21) is also mounted on the main instrument
          panel to indicate the supply voltage.

   (iii)  A ground/flight switch (24) is mounted on the right of the
          main instrument panel.   When the switch is set to FLIGHT
          the aircraft batteries supply all servuices; when it is
          set to GROUND the aircraft batteries are disconnected,
          and an external battery may be used to supply all services.

    (iv)  An external supply socket is mounted on the starboard
          side of the fuselage at the rear of the canopy.

     8.   Pneumatic system

          An engine driven compressor charges an air bottle for the
          operation of the brakes and the flaps.   The bottle pres-
          sure is shown by the upper needle in the pneumatic sup-
          ply and brake gauge (20), and normally this
          should indicate 456 lb./sq. in. (maximum).   If the bottle
          pressure for any reason falls below 230 lb./sq. in. a valve
          in the supply line cuts off the air supply to the flaps so as
          to maintain the remaining pressure in the bottle for the
          operation of the brakes.

     9.   Vacuum system

          An engine-driven vacuum pump is provided for working
          the gyro-operated instruments on the instrument flying
          panel.

    AIRCRAFT CONTROLS

     10.  Flying controls

          The flying controls are conventional in operation, and
          each pair of rudder pedals may be adjusted for reach by
          rotating the appropriate starwheel (4).   With the excep-
          tion of the flaps control, all the controls are duplicated.

     11.  Flying controls locking gear

          A locking gear linkage is provided for locking the flying
          controls and when not in use it is stowed on the sloping
          bulkhead behind the rear seat.
          The control surface can also be locked externally by
          clamps.

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