Revised December 1941.                                          AIR PUBLICATION 1565B       
Issued with A.L.No.19/F                                               Volume I and                 
                                                Pilot's Notes.                 

                                SECTION  I
                            
                    PILOT'S CONTROLS AND EQUIPMENT
          
          INTRODUCTION
     
     1.   The Spitfire IIA and IIB are single seat, low wing
          monoplane fighters each fitted with a Merlin XII
          engine and a de Havilland 20° (P.C.P.) or Rotol 35°
          constant speed airscrew.
             
          MAIN SERVICES
             
     2.   Fuel System -

          Fuel is carried in two tanks mounted one above the
          other (the lower one is self-sealing) forward of the
          cockpit and is delivered by an engine driven pump.
          The tank capacities are as follows:
          
                    Top tank:            48 gallons
                    Bottom tank:         37 gallons 
             
          The top tank feeds into the lower tank, and the
          fuel cock controls (38 and 39), one for each tank,
          are fitted below the instrument panel.
             
     3.   Oil System -

          Oil is supplied by a tank of 5.8 gallons capacity
          fitted below the engine mounting, and two oil coolers
          in tandem are fitted in the underside of the port
          plane.
             
     4.   Hydraulic System -

          An engine-driven hydraulic pump supplied the power
          for operating the undercarriage.
             
     5.   Pneumatic System -

          An engine-driven air compressor feeds two storage
          cylinders for operation of the flaps, brakes, guns
          and landing lamps.   The cylinders are connected in
          series, each holding air at 200 lb/sq.in pressure.
          
     6.   Electrical System -

          A 12 Volt generator, controlled by a switch (56)
          above the instrument panel, supplies an accumulator
          which in turn supplies the whole of the electrical
          installation.   There is a voltmeter (55) on the left
          of the switch.