Issued with A.L.No.19/F

    11.   Flap control
	
          The split flaps have two positions only up and fully
          down.  They cannot therefore, be used to assist take-
          off.  They are operated pneumatically and are controlled
          by a finger lever (25).  A flap indicator was fitted
          only on early Spitfire I aeroplanes.
             
          MAIN SERVICES
             
    12.   Undercarriage emergency operation

      (a) A sealed high-pressure cylinder containing carbon-
          dioxide and connected to the undercarriage operating
          jacks is provided for use in the event of failure of the
          hydraulic system.  The cylinder is mounted on the right
          hand side of the cockpit and the seal can be punctured
          by means of a painted lever (76) beside it.  The
          handle is marked EMERGENCY ONLY and provision is made
          for fitting a thin copper wire seal as a check against
          inadvertent use.
		  
      (b) If the hydraulic system fails, the pilot should ensure
          that the undercarriage selector lever is in the DOWN
          position (this is essential) and push the emergency
          lowering lever forward and downward.  The angular
          travel of the emergency lever is about 100° for
          puncturing the seal of the cylinder and then releasing
          the piercing plunger;  it must be pushed through this
          movement and allowed to swing downwards.  NO attempt
          should be made to return it to its original position
          until the cylinder is being replaced.
		  
    13.   Wheel brakes

          The control lever (35) for the pneumatic brakes is fitted
          on the control column spade grip;  differential control
          of the brakes is provided by a relay valve (43) connected
          to the rudder bar.  A catch for retaining the brake lever
          in the on position for parking is fitted below the lever
          pivot.  A triple pressure gauge (18), showing the air
          pressure in the pneumatic system cylinders and at each
          brake is mounted on the left hand side of the instrument
		  panel.	  
	  
                             ENGINE CONTROLS		  
		  
    14.   Throttle and mixture controls

          The throttle and mixture levers (10 and 11) are fitted in
          a quadrant on the port side of the cockpit.  A gate is
          provided for the throttle lever in the take-off position
          and an interlocking device between the levers prevents
          the engine from being run on an unsuitable mixture.
          Friction adjusters (8) for the controls are provided on
          the side of the quadrant.