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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Why is engine anti-ice used only until -40 for climb and cruise, but at all temperatures in descent?

Why is engine anti-ice secured in cruise and climb when SAT is -40 or less? Yet in descent it is turned on with visible moisture regardless of SAT.
CapMike's user avatar
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Why does the INERT SEP take so long to deploy?

I have experience in Microsoft Flight Simulator with the Daher TBM 930. It has an inertial separator, which I use for de-icing in the simulator. I watched a video on it, and I understand how it works, ...
DaCuteRaccoon's user avatar
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What is the speed of anti-ice bleed airflow in helicopter turboshaft engines?

If we consider the most modern turboshaft engines, what will the approximate speed for the bleed airflow when it's routed from the latter stages of the engine and supplied to the areas that require ...
Arthur C's user avatar
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Ice Protection System for supersonic aircraft

How does a supersonic transport aircraft IPS system work? Does it work only for the engine nacelle or both engine and wing. I was thinking only for nacelle since the wings are usually highly swept. ...
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Why we turn off anti-ice first then put on APU bleed after parking? [duplicate]

In A320 Standard Operation Procedure (Parking procedure), the order of parking procedure is anti- ice off then APU bleed as required. Is there any meaning for this order? Can’t we switch the order ...
user63006's user avatar
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What is the relation between N1 and Wing anti-ice

When wing anti-ice is selected, the N1 or EPR limit is automatically reduced, and the idle N1 or EPR is automatically increased. What does this statement mean ???
Sourabh Jain's user avatar
2 votes
1 answer
1k views

Are pitot systems protected from ice?

Aircraft use pitot tubes or pitot-static tubes. Do these have some kind of anti-ice system? If so, how? And if not, why not? I'll just point out that it doesn't seem trivial to de-ice such a thing. A ...
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Do missiles need anti-icing?

Are anti-icing systems needed for any missile carried by a small combat jet? And if so, how is this achieved? I realize of course that missiles typically fly at Mach 2.5+, so the compressive effects ...
DrZ214's user avatar
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1 vote
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What is a typical range of air temperature used for engine inlet cowl anti icing?

So i was searching the internet for engine inlet cowl anti icing and found that usually compressor bleed air is used to prevent the ice formation in several parts of the aircraft. I am mainly ...
qsct's user avatar
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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 ...
Anonymous Physicist's user avatar
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Why do anti-ice systems on airplanes with automatic ice detectors still need to be manually selected on?

As even minuscule amounts of ice accumulation on aircraft can cause tremendous loss of lift, increases in drag, decreases in engine thrust, and/or flight-control impairment, some method of detecting ...
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What are the conditions under which one would normally switch on the Engine and the Wing Anti Ice?

As per the title. But I would also like to know if both (Engine and Wing) are turned on at the same time or if different conditions dictate the use of each one. I am specifically interested in the ...
Stamatis Vellis's user avatar
2 votes
1 answer
649 views

What prevents fighters from being fitted with jetliner-style bleed-air wing anti-ice?

In a comment, John K points out that: In any case, military fighter aircraft have to avoid icing, which is kind of odd for those that are considered "all-weather" interceptors.. This, to ...
UnrecognizedFallingObject's user avatar
20 votes
3 answers
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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:
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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 ...
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What do the pilots do if the plane they are operating does not have an anti-ice system?

Anti-icing equipment is designed to prevent the formation of ice, while deicing equipment is designed to remove ice once it has formed. These systems protect the leading edge of wing and tail surfaces,...
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Why did the dividing wall separating the engine intakes of early twin-engine Westland Wessexes cause difficulties with intake anti-icing?

The Rolls-Royce1 Gnome-engined variants of the Westland Wessex helicopter family (i.e., the twin-engined versions)2 draw air for both engines from a common intake (having been designed prior to the ...
Vikki's user avatar
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4 votes
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Why don't we use hydrophobic (icephobic) coatings over traditional anti-ice methods?

I am a design engineer on GA aircraft and I had a thought whilst flying in icing conditions the other day. I know there are lots of ways we deal with ice buildup (as per the chart below from this post,...
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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 ...
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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 & ...
Vikki's user avatar
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Topics for high school chemistry project (IB Chemistry IA)? [closed]

I have to do an IB Chemistry IA and I wanted to relate it somehow to aviation; however, I can't do anything super complicated though because I'm only a high schooler. Here are some possible topics ...
John Wright Stanly's user avatar
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4 answers
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What are some Anti-icing solutions for small planes without an on-board system?

When flying during the winter, is there anything I can do to increase my margin of safety, such as anti-icing fluid? I've heard of people spraying their aircraft with propylene glycol, but am curious ...
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Can a single engine on an A320 provide wing anti ice?

Can a single engine on an A320 provide wing anti ice for both wings in the air ?
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Why and how can a fume event occur?

« A fume event occurs when bleed air used for cabin pressurization and air conditioning in a pressurized aircraft is contaminated by fluids such as engine oil, hydraulic fluid, anti-icing fluid, ...
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Are there requirements for ice protection for general-aviation aircraft?

Does anyone know if any regulations exist making it a requirement for general aviation aircraft to have ice protection systems? And any insights on why general aviation aircraft tend to use rubber ...
Gen's user avatar
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Who else is using electro-thermal wing anti-/de-icing apart from the 787?

I am researching into deicing technologies for the future, but apart from Boeing with Ultra/GKN, no one seems to be picking this technology up and being competitive. Any one know why this is? Is it an ...
K Bingham's user avatar
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1 answer
3k 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 ...
Jai's user avatar
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3 votes
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295 views

Does contra-rotating vs regular propellers, have any effect on icing?

I am trying to understand whether can there be any correlation between the contra-rotating propellers and the ice accretion over the wing ? For instance, is there any evidence that ice accretion is ...
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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?
Jai's user avatar
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What is the most critical takeoff shear margin condition for a Type IV anti-ice fluid?

Type II and the more common Type IV anti-ice fluids use non-Newtonian thickening agents so that they can stay put during ground operations, yet shear stresses on the fluid during the takeoff roll ...
UnrecognizedFallingObject's user avatar
13 votes
2 answers
5k views

What does the word "boot" mean?

I found this word "boot" in one book. The chapter was connected with ICING operations, and I found this word with little explanation: A tube bonded to a surface, e.g. wing edge. When pressurized ...
wiaim's user avatar
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Is anti-icing a small area of the windscreen (hot-plates) adequate for the full flight or only an interim solution?

I asked this question about what "the thing on the windscreen of some Piper aircraft is". It came out that it is used as small anti-icing. The user Jules asked following in a comment of an answer: ...
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12 votes
1 answer
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Why is wing anti-ice in transport aircraft not required below -40 degrees Celsius?

Okay, this confuses me. As it gets colder doesn't it mean more possibility of icing? And is the -40 degrees SAT or TAT?
Azizi Akbar's user avatar
23 votes
4 answers
26k 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, ...
SnakeDoc's user avatar
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4 votes
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Do wing warmers exist?

In moto racing, they use tire warmer to keep tires hot when the tire is not running. In particular weather conditions (e.g. heavy snow), aircraft require de-icing operation after staying parked for ...
Manu H's user avatar
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5 votes
1 answer
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Why are the leading edges of the 787's horizontal and vertical stabilizers not painted?

The other day I made a question about the engine painting and why it isn't painted at the front part. The answer was: to facilitate anti-ice system. Source: fervegeon.com So perhaps the leading ...
user13197's user avatar
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8 votes
1 answer
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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 ...
J W's user avatar
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1 answer
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What is the process to remove frost off an airliner? [duplicate]

My aunt recently was going on a flight home and she boarded the flight, but her flight was delayed due to frost on the aircraft. She noticed this crane like device above the aircraft wing during the ...
Ethan's user avatar
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When to turn on deice boots?

This video says (at 25:06) that you should do it as soon as possible. but I just learned in class that you should wait for an ice build up then turn it on vs just turning it on. This would prevent an ...
Tango India Mike's user avatar
3 votes
3 answers
5k 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 ...
ryan1618's user avatar
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7 votes
2 answers
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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 ...
ryan1618's user avatar
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11 votes
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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 ...
Marc's user avatar
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18 votes
3 answers
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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 ...
Fabrizio Mazzoni's user avatar
6 votes
3 answers
3k views

What were to happen if deicing fluid went in to the jet-engine?

What were to happen if deicing fluid went in to an engine. I have heard that deicing fluid is somewhat flammable. What were to happen if it went in to the engine? Would it combust like fuel?
Josef's user avatar
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15 votes
3 answers
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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 ...
sweber's user avatar
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5 votes
2 answers
474 views

Why are CJ2+ Anti-Ice & De-Ice Systems separately controlled?

Why are the CJ2+ anti-ice and de-ice systems separately controlled? Wouldn't it be easier for both systems to be controlled with one button/switch (minimize chance of error from occurring)? Are there ...
181024702710's user avatar
8 votes
2 answers
12k views

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-...
Jae Carr's user avatar
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Why is the de-icing fluid sprayed on jets coloured orange?

On a cold night or if it's been snowing, jets are sprayed with orange de-icing fluid: But why is it orange? If it's to see where's been sprayed and where you've missed a bit, black would be the most ...
Danny Beckett's user avatar
9 votes
1 answer
17k 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 ...
casey's user avatar
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14 votes
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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?
Falconpilot's user avatar