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Questions tagged [icing]

Questions about ice formation on aircraft which degrades performance

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1answer
219 views

Why is a small amount of smooth ice over the top of the wing more dangerous than an accumulation on the leading edge?

According to a Gleim study guide, "Generally speaking, smooth ice on top of the wing is more dangerous than heavy accumulated icing on the leading edge." Is this true? If this is true, why?
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1answer
45 views

To what extent is LLF forecast of icing conditions a concern in VMC?

First off, I know that flying into actual icing conditions in an aircraft not equipped to handle icing is a Very Bad Idea ™ for any number of reasons. That's not what I am asking about here....
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3answers
196 views

Why is carburetor heat unnecessary at full throttle?

Questions like How does aircraft design affect carburetor ice? show how carburetor mount point affects the relative passive heating of the carburetor by the engine, but I've never learned why full ...
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4answers
2k views

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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2answers
202 views

What was wrong with my answers to how to deal with low volt annunciator, and icing, both in IMC/IFR?

I have questions for emergency situation in IMC. I was asked about low volt or icing condition IMC from my school's checker. The checker said "if you see low volt annunciator on PFD how can you deal ...
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0answers
143 views

Are there any aircraft designs that are (relatively) insensitive to the effects of airframe icing?

Snow and ice buildup on aircraft (especially the wings) is a well-known and feared hazard of cold-weather operations; it roughens the surface of the wings and changes their profile, which combine to ...
2
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1answer
133 views

Are there specific names for airport vehicles used for de-icing?

Do de-icing vehicles used at airports for de-/anti-icing procedures have special names? I-ve searched the internet but have not found the exact names of these vehicles.
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4answers
370 views

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 ...
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2answers
2k views

Icing conditions temperature range: SAT or TAT?

Considering the general rule of thumb defining potential icing conditions: temperature between +10 and -40 degrees C and presence of visible moisture, is the temperature range regarding TAT (total ...
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1answer
131 views

What are heat detection sensors and how can they cause a speed error?

From this news article on Saratov Airlines Flight 703: A report handed down by Russian investigators has blamed human error for the crash of Saratov flight 703, saying the pilots didn’t switch on ...
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1answer
96 views

How does ice affect the combustion systems of jet and piston aircraft engines? [closed]

What are the effects of ice on a jet and piston aircraft engine? I've tried Google but I'm not satisfied with the results.
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1answer
72 views

What to do when moisture forms on the helicopter's canopy in a weather front?

Moisture has condensed on the canopy of your helicopter as you fly through a weather front – what should you do?
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2answers
911 views

When to climb and when to descend when faced with icing?

(YouTube) The flight faced icing at FL 90 inbound to Germany from the UK on a world tour. Earlier they were flying above an overcast layer. After they saw the icing they requested FL 70, and asked ...
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1answer
425 views

What is the maximum temperature of engine bleed air for de-icing the wings?

What is the maximum temperature of the air bled from the engines of a Boeing 747-800 and an Airbus A380 to the wings for de-icing? If the air is too hot, how is it cooled?
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1answer
287 views

Are there any airliners and or aircraft that use bleed air and excess heat from the engine to prevent icing [duplicate]

are there any airliners and or aircraft that use bleed air and excess heat from the engine to prevent icing. Rather than use battery power or alternators, this would make sense from an energy ...
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2answers
220 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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3answers
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What are the considerations for landing on ice runways?

In Greenland there are a number of ice runways and I have heard that it is no difficulty landing on them. One would think they would be slippery and the aircraft might slide off the runway or ground ...
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1answer
360 views

Why does pitot tube freeze at an altitude whose temperature is way below the freezing point?

It's supposed that Air France 447 crashed into the Atlantic because the pilots stalled the airplane when the frozen pitot tubes forced them to handfly it while cruising through the thunderstorm. But ...
13
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2answers
4k 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 ...
8
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1answer
648 views

Does the AC-130 have de-ice or anti-ice protection for wings and surfaces?

Does the AC-130 have de-ice or anti-ice protection for wings and surfaces? Can it fly in icing conditions? Looking at many pictures I see no sign of a shiny "hot wing" leading edge nor any boots. Does ...
3
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2answers
1k views

What is the risk of icing with water / moisture on wings prior to takeoff?

If a plane without any deicing equipment has water moisture on the wings (say, from sitting overnight) and that plane is then flown to an altitude which will have temperatures below freezing, what is ...
4
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1answer
200 views

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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2answers
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Is it safe to takeoff with some ice and snow on the wings? [duplicate]

I took a look at the post 'What things can a passenger look out for, to indicate an emergency?', and remembered this video I've seen. Obviously, video uploader claims that this take off was unsafe ...
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1answer
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What's required for a plane certified to fly to Antarctica?

What special features besides the obvious long range does a plane have to have to fly to and land in Antarctica? I know not just any plane can make the trip, but I couldn't find many relevant ...
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2answers
421 views

How can I avoid downdrafts and icing when crossing the Alps in a small airplane?

let's say I need to fly from LSZL to LSZP crossing the Alps with a small airplane (C150, Piper Tomahawk,...). How many times a year I could expect to find the suitable weather conditions to do that (...
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1answer
432 views

How was the “frozen wing flap grease” problem solved? (Antarctica, 2001 emergency evac)

In the June 16, 2016 Washington Post news article A rare, risky mission is underway to rescue sick scientists from the South Pole difficulties of flying in and out of the south pole in winter are ...
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2answers
1k views

Why doesn't ice form on the fuselage?

Ice forms on the wings and instrument probes and vanes, but why not on the fuselage? If the temperature of the air is the same, why does the ice form on the wing but not on the fuselage?
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1answer
279 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 ...
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2answers
433 views

Is the “glory” optical phenomenon frequently seen by aircraft pilots?

A glory being this optical phenomenon: (Source) It reveals the presence of supercooled water, a hazard for an aircraft (see answers). Due to the way it can materialize, the center of the rings ...
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1answer
972 views

What methods exist to detect airframe icing, and how do they work?

What are the primary methods used to detect ice on an airframe, and how do they work on at least a high level?
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1answer
702 views

Are all US airline aircraft certified into known ice?

Are all US airline aircraft certified for flying into known icing (FIKI) conditions? I assume all the large (100+ PAX) aircraft come FIKI certified from the design stage? What's the largest ...
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1answer
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What constitute “known icing conditions” and when can you fly VFR while they exist?

For flight operations conducted under 14 CFR part 91(other than subpart F) in VMC, what conditions constitute "known icing conditions"? Under what circumstances (e.g., altitude difference or no ...
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4answers
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How else can snowy/icy conditions disrupt airport operations?

In casey's fabulous answer here, he identifies several ways snow/ice can disrupt airport operations: Continuous heavy snowfall can eventually close an airport if it becomes impossible to keep the ...
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3answers
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How does flying below the freezing level in a thunderstorm help avoid the most critical icing?

AC 00-6A (Aviation Weather) Chapter 11 states: Do's and Don'ts of Thunderstorm Flying To avoid the most critical icing, establish a penetration altitude below the freezing level or ...
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Why is carburetor heat use discouraged on the ground?

I've been reading my private pilot books for when I start in February and Carb Heat has me stuck in a rut. I feel like I need to have a very solid understanding of this being that I live in a very ...
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Why would a canard wing be more prone to icing than a stabilizer?

Someone said a canard wing is more prone to icing than a stabilizer. If true, what would explain this?
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1answer
167 views

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 ...
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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 ...
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1answer
282 views

How to get out of icing conditions asap?

We all know certain weather can cause ice to form on an aircraft, and the danger it poses. Obviously the best way is to avoid flying near these areas in the first place. Let's say I happen to fly ...
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2answers
909 views

Why do some commercial flights start off unpressurized?

In this video, the B738 starts takes off without the plane's pressurization system engaged. The video specifically notes that the craft is being pressurized fairly soon after the takeoff has happened....
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3answers
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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 ...
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1answer
3k views

Where does ice collect first on a wing in flight and why?

I've seen some reports that say ice forms on the back half of the wing and on the outside edge of the wing (the part furthest from the body) before it will form anywhere else. I'm wondering if this ...
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6answers
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Why is full carb heat recommended when reducing power below normal setting?

In my first flight lesson today, my instructor asked me to apply full carburetor heat when we had to reduce power to 1900 RPM in our Cessna 152. I was surprised by this as I didn't remember learning ...
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2answers
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Is freezing of windows normal in airlines?

Recently I was flying on an Airbus A320. While cruising around 37,000 feet, I noticed half of the glass on the window had frozen. But it was a thin layer of ice. Was it anything to be concerned about?...
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2answers
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How does induction ice form in and affect jet engines?

Recently someone talked to me about the possibility of induction ice on the engine: He told me that because of conditions around fan and compressor blades (mainly because of pressure and temperature) ...
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1answer
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Are aircraft with counter-rotating props or Down Between Engines less likely to develop asymmetric icing?

It is suggested by some (and somewhat substantiated) that twin-engine propeller aircraft which do not have counter-rotating props (all modern regional turboprops are this way) can develop asymmetric ...
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2answers
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Is there any disadvantage to having the de-icing system on?

I was watching Mayday S11E02 about West Caribbean airways flight 708 and the pilots turned off the de-icing system partway through the flight. It's not why it crashed, but I was curious as to if there ...
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3answers
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Why doesn't frost form on a moving airplane?

When I was a young student pilot, long before the FAA prohibition on polished frost went into effect, an instructor left a six-inch square of frost on the wing to demonstrate how fast it would ...
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2answers
2k views

Will an aircraft always crash on take-off if de-icing is not performed correctly?

I recognise the Daily Mail's propensity to adulterate and colour news, but are these user comments about the UAL951 flight on 29 Dec 2014 correct? The Daily Mail claims: A United Airlines plane ...
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Is on-board equipment for in-flight de-icing also used on the ground?

Aircraft operating in icy conditions are equipped with de-icing equipment to remove ice from specific parts of the aircraft (wing, sensors,...) in flight. When there is snow or icy conditions while ...