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Know which areas of the wings and engines receive ice protection.
-Wings: outboard three slats (slats 3, 4, & 5)
-Engines: the engine nacelle leading edge
Recall the conditions that require the use of wing anti- ice.
Turn on wing anti-ice whenever there is an indication the airframe is accumulating ice. Indications may be observed on the visual ice indicator between the windshields or on the wipers.
Recall the conditions that require the use of engine anti- ice.
Engine anti-ice should be used whenever icing conditions exist or are anticipated for both ground and flight operations. Engine icing conditions exist when the OAT is 10o C or below, and visible moisture in any form is present (clouds, fog with visibility of one mile or less, rain, snow, sleet, and ice crystals).
Know whether or not engine bleed air must be selected "ON" before using engine anti-ice.
Engine anti-ice is plumbed independently off of the high pressure compressor; therefore, engine bleed air does NOT have to be selected "ON" to use engine anti-ice.
Describe what occurs if the ENG 1(2) pbs on the overhead ANTI ICE panel are selected "ON".
-A blue "ON" light illuminates on the respective pb.
-The memo section of the E/WD displays "ENG A.ICE"
-The respective engine anti-ice valve opens to supply
engine anti-ice to the nacelle leading edge.
-Continuous ignition is automatically activated for that
-The N1 limit for that engine is automatically reduced.
-Engine idle speed is automatically increased.
Describe the indications that are present when wing anti-ice is selected "ON" on the overhead ANTI ICE panel.
-A blue "ON" light illuminates on the WING pb.
-The memo section of the E/WD displays "WING A.
ICE" in green.
-The words "ANTI ICE" appear in white on each side of
the BLEED page.
-Green arrows appear on each side of the BLEED page
when the respective wing anti-ice valves open for each wing.
Recall what occurs if wing anti-ice is selected while on the ground.
The wing anti-ice valves open for a short period of time, and then automatically close. The blue "ON" remains illuminated on the WING ANTI ICE pb until the pb is deselected.
Know the limitation regarding use of wing anti-ice with slats extended.
Extended flight in icing conditions should be avoided due to reduced wing anti-ice capability with the slats extended.
Describe what causes the amber FAULT lights to illuminate on the WING and ENG 1(2) ANTI ICE pbs.
The FAULT lights illuminate:
-momentarily during valve transit.
-if there is disagreement between the selected position and the actual position of the valve.
-for the WING pb, if low bleed air pressure is detected.
Describe how the two Window Heat Computers (WHCs) automatically provide window heat when the PROBE/WINDOW HEAT pb is left in the AUTO (lights out) position.
-With at least one engine running, the WHCs automatically heat the two forward windshields and the two most forward side windows electrically.
-While on the ground, the windshields receive low level heating.
-While in flight, the windshields automatically shift to high level heating.
-There is only one heat level for the side windows.
Describe how the three Probe Heat Computers (PHCs) automatically provide probe heat when the PROBE/WINDOW HEAT pb is left in the AUTO (lights out) position.
-With at least one engine running, the PHCs automatically heat the pitot tubes, static ports, TAT probes, and AOA probes.
-While on the ground, the TAT probes are not heated, and the pitot tubes are heated at a low level.
-All probes and ports transition to normal heating levels once airborne.
Understand the difference between selecting the PROBE/WINDOW HEAT pb "ON" vs. leaving it in the AUTO (lights out) position.
Selecting the PROBE/WINDOW HEAT pb "ON" overrides all AUTO logic. However, all probe/window heating occurs exactly the same (ground vs. in flight). Probe/window heating will not transition back to the AUTO mode unless the pb is manually selected off.
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