Anti Ice Flashcards
If operating on standby power the probe heat indicates
Probe heat lights do not indicate system status
Only CPT pitot probe is heated - no light indication for a failure
COWL ANTI ICE lights illuminating amber indicates
Overpressure condition in duct downstream of engine anti ice valve
ENGINE ANTI ICE switched to ON what happens
Related anti ice valve opens
Stick shaker logic is set for icing conditions
Green TAI indication shows on engine display
ENGINE ANTI ICE switched to OFF what happens
Related cowl anti ice valve is closed
Stick shaker logic returns to normal if wing anti ice has not been used
Green TAI indication on engine display extinguishes
TAI amber indication
Cowl anti ice is not in position indicated by related anti ice switch
WING ANTI ICE on (in the air)
Wing anti ice valves open
Stick shaker logic is set for icing conditions (Remains set for icing conditions for the remainder of the flight)
WING ANTI ICE on (on the ground)
Wing anti ice valve opens if thrust lever on both engines is below takeoff warning setting and temperature inside both distribution ducts is below thermal switch activation temperature
Control valves close if either engine thrust is above takeoff warning setting or thermal switch activates (Switch remains ON)
Switch trips OFF on lift off
What does the stall warning logic adjust when anti ice is selected on
Stick shaker and min maneuver speed bars
FMC displayed vref is not adjusted automatically
Wing anti ice provides protection to
3 inboard LE slats
Wing anti ice control valves are powered by
AC motor operated
Wing anti ice will automatically reopen on the ground when
Thrust on both engines is reduced and both temperature sensors are cool
Duct temp and thrust setting logic has no effect on the control valves in flight
