737 Systems: Anti-Ice/Rain Flashcards
Which Flight Deck windows are heated?
Windscreens and side windows (L2/L1/R1/R2)
What happens if an overheat condition is detected in a heated window?
The OVERHEAT light illuminates
What does the Engine Anti-Ice System protect from icing?
The engine cowl lip
How does the Engine Anti-Ice affect stall speed and engine thrust?
When turned on, the Vmin speed and maneuvering speed bars are increased, and the engine goes into Approach Idle
What does a COWL ANTI-ICE light indicate?
Overpressure condition in the duct leading to the cowl lip from the cowl anti-ice valve
What does a COWL VALVE OPEN bright blue light indicate?
Valve in transit or in disagreement with switch position
What does a green TAI above the N1 readout indicate? Amber?
Green: Switch on and valve open
Amber: Valve fails to move into the position selected by the switch
What does the Wing Anti-Ice System protect from icing?
The 3 inboard slats
What is the difference between a dim blue and bright blue Wing Anti-Ice VALVE OPEN light?
Dim: Valve OPEN with switch ON
Bright: Valve in transit OR valve position disagrees with switch
What would cause the Wing Anti-Ice valves to close automatically if selected ON while on the ground?
Thrust levers advanced for takeoff or either temperature sensor sense a duct over temp (125C)
How does the Wing Anti-Ice system operate if selected ON for takeoff?
Wing Anti-Ice will be on until the advancement of thrust levers, and once the Air/Ground sensor goes to air mode at liftoff, the switch will trip off to remove the disagree and preserve 2nd segment performance
How is aircraft stall protection logic affected while using Wing Anti-Ice?
Adjusts Stick Shaker and minimum maneuver speed bars, which remains for the rest of the flight regardless of switch position
Which external probes, vanes, ports, antennas, etc are heated by the Probe Heat System?
-CA/FO/AUX Pitot
-L/R Elevator Pitot
-L/R AOA Vane
-Temp Probe
(Applied once either engine is operating and AUTO is selected)
