Questions tagged [anti-ice]

Systems that aim to prevent ice from forming on the outer surface of an aircraft, especially the wings, engine intakes, windows, and propellers (as applicable).

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18
votes
3answers
17k views

How do large airliners de-ice in flight?

How do large airliners de-ice their surfaces in midair? In smaller planes like the ATR or the caravan there are deicing boots as per picture: How is this achieved on bigger aircraft, as there seems ...
13
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2answers
5k views

Why do only some aircraft require tail anti-icing?

Why do some aircraft require anti-icing on the tail while others (Dassault Falcon Jets, Boeing 737, 747, etc.) don't?
8
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2answers
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What do they use to de-ice aircraft and runways on snowy days?

One of the answers to this question mentions how runways are usually in need of de-icing on cold days (which makes sense), and as anyone who has ridden an airplane on a cold day knows, planes need de-...
15
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3answers
6k views

Why is bleed air taken from some stage of the compressor used for de-icing? Why not e.g. exhaust gas?

In the answers to this question, it is said that The de-icing system on most turbine aircraft (including MD-82 involved in that accident) uses bleed air from the engines, that is it extracts some ...
12
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1answer
1k views

Why are some parts of the wings not protected by the wing anti-ice system in the B737?

This picture is an explanation on the wing anti-ice system of the B737. As you see from it, the system doesn't protect the outboard leading edge slats and the leading edge flaps from icing. Anybody ...
11
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3answers
3k views

Why is the B787 one of the few aircraft with electro-thermal wing anti-/de-icing?

While I was searching for a listing of aircraft with different anti-/de-icing methods - especially for electro-thermal wing anti-ice - I couldn't find any information about other aircraft except the ...
3
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3answers
4k views

What common forms of deice and anti-ice exist and what future alternatives are being researched?

For the leading edges of aircraft's flight surfaces, there are a few more common deice and anti-ice methods available. What are the most common systems? What are the alternatives? Is there any ...
20
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3answers
19k views

Why not have Pitot Heat always on?

Most (all?) aircraft have a Pitot Heat Switch which must be turned on in certain conditions. Seems Pitot Heat is one of those things you don't want to forget to switch on when it's needed, or worse, ...
9
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1answer
15k views

What are the different kinds of de-ice fluid?

When frost adheres to the airplane or it is snowing, you need to make sure the airplane is clean when you depart. You've probably seen the trucks spraying aircraft in the winter before departure, but ...
5
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1answer
267 views

When and where are anti-ice required for supersonic flight?

Many aircraft have heating devices to prevent dangerous icing. Supersonic aircraft rapidly compress the air, leading to elevated temperatures. Concorde and Tu-144 used fuel as a heat sink. How fast ...
7
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1answer
4k views

Why can't we use APU bleed air for wing anti ice on the A320?

The question says it all. While reading I came across this that we can under no circumstances use APU bleed air for supplying wing anti ice? Any reason?
7
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2answers
20k views

What is the difference between deice and anti-ice?

Most aircraft contain systems which are used to mitigate problems which could be caused by ice. This includes everything from a heated pitot tube to a wing leading edge heated by bleed air. These ...
19
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3answers
9k views

Why do aircraft with turboprop engine have black painted anti-icing system?

Everyday as I watch aircraft with turboprop engines, a question pops up: Why do aircraft with turboprop engines have black painted anti-icing system? For instance:
15
votes
1answer
4k views

Why is a 737 Original speed-restricted below 10 kft with inoperative windscreen heating?

According to this page on the 737's operational limitations, the Original 737s (737-100/-200) are limited to 250 KIAS below 10 kilofeet if the windscreen-heating system is inoperative: Anti-Ice & ...
8
votes
1answer
339 views

Can IPA be used as a FSII with MoGas, particularly with a Peterson STC?

This question established a basis for the use of 100% Isopropyl Alcohol (IPA) as a Fuel System Icing Inhibitor (FSII) in aviation gasoline systems. However, this Cessna Service Letter documents that ...
4
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2answers
694 views

What is the impact of thermal Anti-Ice on descent performance?

I am just another one of the passionate flight simmers trying to understand more about Anti-ice system mechanics. I am talking about the Boeing 737-800 here if it makes a difference. What bothers me ...
1
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1answer
2k views

Could someone please explain why the A320 doesn’t have an anti ice system for its vertical and horizontal stabilisers? [duplicate]

I had come across in the FCOM that there is no anti ice system for the vertical and horizontal stabilisers while looking at the schematic diagram. I find it very strange that the other surfaces on the ...