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9 Cards in this Set
- Front
- Back
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Recall the function of the TAIL De-Ice Pushbutton:
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Push - (Air foil system in use) Closes the shutoff valve to the tail to allow 2.5 minutes of tail de-ice. The system automatically reverts to wing anti-ice function following the 2.5 minutes of tail de-ice function.
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Understand how to activate air foil ice protection:
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The system is activated by selecting the AIR FOIL switch to ON and placing the crossfeed valve(s) to OPEN.
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Understand the effect of moving the Ice Protection Panel METER SEL & HEAT Selector switch out of the off position:
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Moving the selector to any position except the OFF energizes all heater circuits, except the RAT probe while on the ground.
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Recall the function of the WINDSHIELD ANTI-ICE Switch:
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*OFF - Deactivates the windshield anti-ice system.
*ON - Provides electrical heat to the outside of Captain's, Center, and First Officer's windshields. |
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Recall the airfoil anti ice protection cycle:
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*Air foil ice protection is only available in-flight.
*The system is activated by selecting the AIR FOIL switch to ON and placing the crossfeed valve(s) to OPEN. This action provides a continuous cycle of heat for the leading edge of the wings (slats) and the forward strakes for fifteen minutes, followed by 2 1/2 minutes of heat to the horizontal stabilizer. The ram air inlet is heated during both cycles. *The automatic cycle can be overridden by the TAIL button which, when pushed, provides 2 1/2 minutes of horizontal stabilizer de-icing, after which a new wing cycle starts. *Placing the AIR FOIL switch in the OFF position causes the horizontal stabilizer de-icing cycle to be activated for 2 1/2 minutes. |
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Understand the function of the OVERWING HEATER Switch:
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*ARM - Provides electrical power to the wing heater control units when the airplane is on the ground. The switch is normally guarded to this position.
*OFF - Removes electrical power from the heater control units. |
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Understand the function of the Overwing Heater system:
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*the overwing heater system prevents the buildup of ice on the inboard corner of the upper wing.
*The overwing heater system does not de-ice the entire wing nor does it provide anti-ice or de-ice capability for environmental icing conditions. |
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Describe the indications on the OAP when engine anti-ice in use:
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*When selected ON, an amber (L/R) ENGINE VALVE message will appear on the OAP indicating the valves are in transit and disagree with the switch position.
*When at least one valve is fully open, a blue (L/R) ENGINE ANTI-ICE ON light on the OAP illuminates. *When all three valves are fully open, the amber message extinguishes and the blue light remains illuminated indicating normal system operation. |
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Describe the conditions that require the use of engine anti-ice while on the ground/in-flight:
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*Ground - Engine anti-ice systems must be on after start when the ambient temperature is 6 degrees C (42F) or below and any of the following conditions exist. Visible moisture as in rain, snow, or fog (visibility 1 mile or less in fog), or 3 degrees C or less temperature/dewpoint spread exists or runways and taxiways are wet.
*Flight - Activate engine anti-ice before entering ice conditions. In flight, a RAT/TAT of 10 degrees or below with visible moisture indicates a need of engine anti-icing. |
