I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 73
FOR SIMULATION USE ONLY ā NOT A TRAINING AID
FRESH AIR VENTILATION
Fresh air ventilation during unpressurized flight can be supplied to the cockpit
through the cooling air inlet. Air flows through the cooling air inlet duct through the
motor-driven fresh air valve, when opened, to the main inflow duct just forward of
the firewall.
The position of the fresh air valve during ground operations and unpressurized
flight is controlled by a switch, placarded RAM AIR FLOW, on the environmental
control panel in the front cockpit only. Electrical power to the valve is supplied by
the hot battery bus.
The valve has three positions: closed, mid open, and full open. This corresponds
respectively to the OFF, NORM, and HI positions on the RAM AIR FLOW switch. On
the ground, the same blower providing cooling air to the heat exchanger provides
air to the motor-driven fresh air valve.
The fresh air valve is automatically closed when approaching 8000 feet pressure
altitude as the cockpit begins to pressurize.
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