Anti-Ice and Rain Flashcards
What are reasons the green ON light would extinguish on the Window Heat Panel?
-switch is OFF
-overheat detected
-System fault occurred
-system is at correct temperature
If the window heat switch is ON and the associated green light is not illuminated, how can you determine if the system is operating normally?
Perform a window heat test
What does selecting the OVHT position of the window heat test switch cause?
a simulated overheat condition
With the probe heat switches in AUTO, when is power automatically supplied to the probe heat system?
power is automatically supplied to both A and B probe heat systems when either engine is running
What causes the COWL ANTI-ICE light to illuminate?
An overpressure condition in duct downstream of cowl anti-ice valve
The blue COWL VALVE OPEN lights have been replaced on the MAX with amber COWL VALVE lights and an associated QRH procedure. What do the amber COWL VALVE lights indicate?
Momentary: related cowl anti-ice valve is in transit
Steady: cowl anti-ice valve position disagree with related ENGINE ANTI-ICE Switch position
what does the amber ENG ANTI-ICE light indicate on the MAX?
Cowl thermal anti-ice system has been inhibited due to a system failure or when an engine core anti-ice valve fails closed
The max has an additional engine anti-ice feature called CORE anti-ice. How is it operationally controlled?
Core anti-ice is automatically controlled by the EECs with no crew input or indication of normal operation
Besides controlling the engine anti-ice functions, what does placing the ENG ANTI-ICE switches to the ON position do?
It sets stall warning logic for icing conditions.
NOTE: stall warning logic adjusts stick shaker and minimum maneuver speed bars on the airspeed indicator. FMC displayed VREF is not adjusted automatically.
Stall warning logic, airspeed indications, and min maneuver speeds on the airspeed indicator return to normal when the engine anti-ice is positioned OFF if wing anti-ice has not been used in flight
When using engine anti-ice, what additional idle speed is available in the MAX?
Icing idle, with the flaps UP and approach idle when the flaps are extended
What areas of the aircraft are heated with the wing anti-ice switch selected to ON
the 3 inboard leading edge slats using bleed air
What is the guidance for using wing anti-ice on the ground?
-Do not operate wing anti-ice on the ground when OAT is above 10C
-do not use wing anti-ice as a substitute for ground deicing/anti-icing
-The wing anti-ice switch will be turned OFF prior to beginning the takeoff roll
If the wing anti-ice is activated on the ground, what happens when you advance the thrust levers for takeoff?
The wing anti-ice valves automatically close and at liftoff, the wing anti-ice switch trips to OFF
In the MAX, what is the logic associated with the amber L VALVE and R VALVE lights
Momentary: related wing anti-ice valve in transit
Steady: wing anti-ice valve position disagrees with related WING ANTI-ICE switch position
Extinguished: related wing anti-ice valve is closed (switch OFF) or related wing anti-ice valve is open (Switch ON)
