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.
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