Issued with A.L.No.19/F

     
     (b)   The upward and downward identification lamps are
           controlled from the signal switchbox (64) on the
           right hand side of the cockpit.  The switchbox has a
           switch for each lamp and a morsing key, and provides
           for steady illumination or morse signalling from each
           lamp or both.  The switch lever has three positions:
           MORSE, OFF and STEADY.
          
     (c)   The spring pressure on the morsing key can be adjusted
           by turning the small ring at the top left hand corner
           of the switchbox, adjustment being maintained by a
           latch engaging a number of notches in the ring.
           The range of movement of the key can be adjusted by
           opening the cover and adjusting the screw and locknut
           at the centre of the cover.

     40.  Landing lamps

          The landing lamps, one on each side of the aeroplane,
          are housed in the undersurface of the main plane.  They
          are lowered and raised by a finger lever (36) below the
          instrument panel.  Each lamp has an independent
          electrical circuit and is controlled by a switch (16)
          above the pneumatic control lever (36) with the switch
          in the central position both lamps are off; when the
          switch is moved to the left or to the right, the port
          or the starboard lamp respectively, is illuminated.
          A lever (15) is provided to control the dipping of both
          landing lamps.  On pulling up the lever the beam is
          dipped.

     41.  Signal discharger

          A straight pull of the toggle control on the left hand
          side of the cockpit fires one of the cartridges out of
          the top of the fuselage, aft of the cockpit.
       
                           DE-ICING EQUIPMENT
       
     42.  Windscreen de-icing
            
     (a)   A tank containing the de-icing solution is mounted on the
           left-hand side of the cockpit directly above the bottom
           longeron.  A cock is mounted above the tank, and a pump
           and a needle valve to control the flow of the liquid are
           mounted below the undercarriage emergency lowering
           control.  Liquid is pumped from the tank to a spray at
           the base of the windscreen, from which it is sprayed
           upwards over the front panel of the screen.