ENVIRONMENTAL CONTROL PANEL

The environmental control panel (fig. 4-12) is located on the center console and is used by the flight crew to control temperature, pressurization, and anti-icing functions. The discussion of this panel is limited to the ram-air valve position selector, air-conditioning switch, and the cabin air temperature selector.

Ram-Air Valve Position Selector

When the ram-air valve position selector (AUX VENT switch) is placed in the OFF position, the automatic mode is established by way of the fluidic control system. Clockwise rotation towards the ON position overrides logic controls of the air-conditioning system. Control of the ram-air shutoff valve is determined by the

Figure 4-12.-Environmental control panel.

magnitude of the current, which is proportional to the setting of the auxiliary vent switch.

Air-Conditioning Switch

The air-conditioning switch (AIR COND switch) is used to activate the air-conditioning system. When air conditioning is automatically shutdown and the ram-air shutoff valve has fully opened, the air-conditioning switch must be set to OFF/RESET, and then back to ON to restore normal operation.

Cabin Air Temperature Selector

The cabin air temperature selector (TEM SELECT switch) has a manual and an automatic mode of operation. The temperature select switch operates manually in the same manner as the auxiliary vent switch. In the automatic mode, cabin temperature is selectable from 60 to 80F.