There are three pressure compartments in your ship: Forword, Aft,
and Tail. (See Fig. 13). The forward and aft cabins are connected by a
communicating tunnel running over the bomb-bay; the tail compartment is
isolated when pressurized.
OPERATION: The cabins are pressurized from the superchargers of the two
inboard engines. Your flight engineer controls the air-flow from these
superchargers, permitting the cabin Pressure Regulators to automatically
regulate the air pressure within the cabin. From ground level to 8,000
ft the cabins are not pressurized. When the cabins are under pressure,
your cabin altitude will remain at 8,000 ft, while the ship is flying at
any altitude up to 30,000 ft. When your ship gets about 30,000 ft, the
cabin pressure will rise proportionately so that it reaches about 12,000
ft when the ship is at 40,000 ft. (See Fig. 14 for this pressure
relation). Cabin temperature is controlled by thermostat.
[Illustration: Fig. 14]
EMERGENCY PRESSURE RELEASE. Since all emergency doors open in, cabin
pressure must be released in all emergencies. This is done by a valve
controlled by cable from: