PART 1-DESCRIPTIVE

          and Mod. 3627 is not embodied the jack may be operated
          by the handpump.
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Page 21  (c)  If Mod. 3627 is embodied, pull the jettison handle and, if
Para.            necessary move the EMERGENCY HYDRAULICS lever
28 (c)           aft.
A.L.1      
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      29. Cockpit pressurising, heating and ventilation

                   COCKPIT PRESSURIZATION AND HEATING

      (a) The pressurisation heating and ventilation system is con
          trolled by a wheel (1) on the port wall which alters the
          settings of two valves, one admitting hot air and one cold
          air. The hot air is obtained direct from the engine
          impeller. The cold air supply is from the same source,
          but is first passed through a cold air unit in the port
          wing. The settings of the wheel are as follows:-

          OFF	Both valves shut, no pressurisation.
          COLD	Hot air valve shut, cold air valve fully open.
          MIX	Both valves partially open. As the wheel is

21