Note: If the engine fails to start on the first
                    cartridge, no more priming should be carried out
                    before firing the second, but another stroke
                    should be given as the second cartridge is
                    fired.

        (vi)  As soon as the engine is running evenly, screw down the
              priming pump.

    5.        TESTING ENGINE AND INSTALLATIONS

         (i)  While warming up, exercise the airscrew speed control
              a few times.  Also make the usual checks of temperatures,
              pressures and controls.  Brake pressure should be at
              least 120 lb/sq.in.
             
        (ii)  See that the cockpit hood is locked open and that the
              emergency exit door is set at the "half-clock"
              position.

       (iii)  After a few minutes move the airscrew speed control
              fully forward.

        (iv)  After warming up, open the throttle to give maximum              
              boost for cruising with WEAK mixture and test the
              operation of the constant speed airscrew.
             
         (v)  Open the throttle to give maximum boost for cruising
              with RICH mixture and check each magneto in turn.  The
              drop in r.p.m. should not exceed 150.

        (vi)  Open the throttle fully momentarily and check static
              r.p.m. boost and oil pressure.

       (vii)  Warming up must not be unduly prolonged because the
              radiator temperature before taxying out must not
              exceed 100°C.              
              
              When engines are being kept warm in readiness for
              immediate take-off, de Havilland 20° C.S. propeller
              should be left in fine pitch - control lever fully
              forward.
              
    6.        TAXYING OUT

              It may be found that one wing tends to remain down
              while taxying.  This is due to stiffness in the
              undercarriage leg, especially in a new aeroplane.