Quiz question: Anti-Icing Systems

ROSWELL41

ROSWELL41

New Member
The following question was on a test I took today. Curious to see what you guys think the correct answer is. I got it wrong I believe. I'll reveal the answer (I've heard is the correct one) later.

Which of the following is NOT anti-icing?
a. Pitot Tube
b. Windshield
c. AOA Indicator
 
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The following question was on a test I took today. Curious to see what you guys think the correct answer is. I got it wrong I believe. I'll reveal the answer (I've heard is the correct one) later.

Which of the following is NOT anti-icing?
a. Pitot Tube
b. Windshield
c. AOA Indicator

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Think of it this way: Anti-ice systems prevent ice from forming in the first place. Deice systems remove ice that has formed. Some items will vary on different aircraft/applications. Some are pretty standard. An example of a standard one would be wing deice boots....they remove accumulated ice when activated (deice). Cycling them when there's no ice accumulation does nothing, so they'd be useless as anti-ice.

For us, applications-wise, whenever pitot heat is on, the AOA vane is getting heated too, making both anti-ice. Windshield heat, for us, is something we don't keep running normally, so for us it's a deice system (even labled as such).
 
Actually, the way that it's written, none of them are anti-ice systems.
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But the correct answer should be "B" Windshield. The pitot tube and AOA indicator are both heated to prevent the formation of ice, and the windshield "de-ice" systems are used to eliminate ice once it's already accumulated. I agree with Mike.
 
With one exception I suppose. There is a windshield anti-ice system that doesn't involve defrost air or alcohol. Its actually a glass panel attached to the outside of the window on the pilot's side with electrical wires running through it. When turned on, it heats the pane and prevents ice from forming, making it "anti-ice."

I guess the question needs more clarification, if they are looking for something else, other than "B."
 
Yeah, I was told by a few other people the answer was windshield. I think we should be able to get the question thrown out due to the various exceptions to the question that you all have stated. Thanks for the replies.
 
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Yeah, I was told by a few other people the answer was windshield. I think we should be able to get the question thrown out due to the various exceptions to the question that you all have stated. Thanks for the replies.

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That was poorly worded question. We had one of those questions on a recent test, but it was based off the seminole system. So I based my answer on that, it all depends on which aircraft the professor was asking the question for. I think they are all anti-ice systems now that I think about it.
 
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With one exception I suppose. There is a windshield anti-ice system that doesn't involve defrost air or alcohol. Its actually a glass panel attached to the outside of the window on the pilot's side with electrical wires running through it. When turned on, it heats the pane and prevents ice from forming, making it "anti-ice."

I guess the question needs more clarification, if they are looking for something else, other than "B."

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Hence, my "depending on applications" caveat.
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I agree with Jay. As written, the question is so poorly worded that it is unanswerable.

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Windshield heat, for us, is something we don't keep running normally, so for us it's a deice system (even labled as such).


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Normally we do leave our windshield heat on all the time. By heating the windshields, they become less brittle and less likely to break in the event of a bird strike.

Likewise, our pitot and AOA heat is normally on as well.

The only items that we normally switch on and off in flight are the engine heat, elevator horn heat, and de-ice boots.
 
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