Anti Ice Overhead Flashcards
What is powered with the Window Heat switches ON? What is de-powered with the switched OFF?
ON: Controlled Heat is applied to the windshield.
*Only the front two windows are heated for anti-ice (exterior) and anti-fog (interior). Side windows are only heated for anti-fog (interior). Heat to side windows is automatic whenever AC power is on the airplane. Side window heat has no cockpit control.
OFF: Off for 10 seconds resets a heat controller fault
What does the INOP light in the Window Heat switch mean?
The switch is off, or
An overheat has occurred, or
A system fault has occurred.
What do the Washer switches do in the ON position?
Washer Fluid is applied to the respective windshield. The switch is spring loaded to the neutral position.
What do the OFF, LO, and HI positions of the Wiper switches do? N499MC
OFF: Off and sequence to the stowed position.
LO: Operates at low speed
HI: Operates at high speed
What does a VALVE light in the Wing Anti-Ice switch mean? N499MC
The position of the valve in either wing disagrees with the switch position.
What does the Wing Anti-Ice switch do when pressed IN/OUT? N499MC
Out=OFF: Wing Anti-Ice valve commanded closed
IN=ON: In flight WAI valve opens to supply bleed air to leading edges of wing
**On ground: system is OFF and WAI valves closed regardless of position of switch.
What do the OFF, AUTO, and ON positions of the Nacelle Anti-Ice Switches do? N499MC
OFF: NAI valve commanded closed
AUTO: In flight the system operates when nacelle icing conditions exist and the ON position requirements are met.
ON:NAI valve opens when bleed pressure is available and PRV is open. . .
. . . PRV may be closed due to current or prior bleed duct overheat, starter valve not closed, or engine High Pressure bleed valve stuck open.
ON: Selected engine ignitors operate continuously
**System works on the ground or in flight in the ON position.
