Windshield Heating System
Fog on the windshield.
Windshield frost or fogging is eliminated by a combination of heated nitrogen gas between the two glass panels and a heater element within each inner glass panel.
A 1/4-inch line from the pilot's pressure suit supply line discharges a constant flow of heated nitrogen gas between the panels to dissipate moisture which may have collected in this area. Each heated inner panel is controlled by a toggle switch.
Windshield heater switches (under the guarded ventral arming switch).
Two adjacent, two-position toggle switches [36, fig. 5-1], labeled "WINDSHIELD HEATER", control primary DC power to the windshield heater elements, one for each side panel. The switches are located in the lower right corner of the instrument panel right wing. When the switches are moved ON (up), primary DC bus power is applied to the heater elements.
Note: In the virtual cockpit, windshield frost or fogging will melt in about 10 seconds after moving the windshield heater switches to ON or turning the windshield antifogging handle [2, fig. 4-3] to horizontal. The switches and the handle will respond to a single mouse click. You may have to open the [ventral arming switch guard [35, fig. 5-1] to access the two windshield heater switches on the instrument panel right wing.
See also:
Air Conditioning and Pressurization System Controls and Indicators