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                           PART 1-DESCRIPTIVE


         23.   Cockpit sealing and pressurising

           (i)  A canopy seal cock (51) is mounted on, the starboard
                cockpit wall forward of the crank handle.  The cock
                admits air pressure to the rubber canopy seal from the
                engine blower casing when turned ON, or deflates the
                seal through a connection to the suction side of the
                vacuum pump when turned OFF.  The canopy seal
                must only be inflated when the canopy is closed and
                must be deflated before it is opened.
           (ii) The cockpit pressurising lever (57) marked ON-
                CABIN BLOWER-OFF is mounted forward of the
                canopy seal lever.  This lever should be moved down for
                pressurising and up when pressure is not required.  The
                cabin blower is engine driven and supplies air through the
                cockpit air regulator.  The cockpit pressure is auto-
                matically controlled by a valve which starts pressurising
                the cockpit at about 15,000 ft. and progressively increases
                the differential pressure to a maximum of 2¾ lb./sq. in.
                at 35,000 ft.
           (iii)The cockpit altimeter (29) on the right-hand side of the
                instrument panel will show the altitude corresponding to
                the cockpit pressure, and the pilot should regulate his
                oxygen supply to correspond with this altitude.  A cock-
                pit pressure gauge (28) and warning light (31) are also
                provided.  The warning light glows when the cockpit
                pressure is ½ lb./sq. in. below the standard; this light may
                flicker on and off during the climb.


         24.   Seat adjustment

                A lever (56) on the right-hand side of the seat provides
                adjustment for height.


          25.   Oxygen system

                A Mk. 11C. regulator (37) is mounted on the right-hand
                side of the instrument panel.  Access to the charging valve
                is gained through the starboard ammunition door.


         26.   Windscreen de-icing

                A handpump (36) with a regulator is mounted on the
                bottom right-hand side of the instrument panel.
A.L.1                         On some aircraft a hot air supply assists in canopy and windscreen
                                de-icing ; the controlling lever is mounted on the cockpit port wall
                                above the undercarriage selector lever.

21

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