Questions tagged [icing]

Questions about ice formation on aircraft, which degrades performance.

Filter by
Sorted by
Tagged with
11 votes
2 answers
6k views

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 ...
0 votes
1 answer
80 views

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, ...
0 votes
2 answers
213 views

Is there a certain minimum temperature we need to turn on pitot heat on light trainer aircraft (eg DA40NG)?

Is there a certain minimum temperature we need to turn on pitot heat on light trainers (eg DA40NG)? In the AFM and checklist documents for the DA40NG, information is given that it should only be ...
0 votes
2 answers
180 views

When carburettor heat knob is partially open, is the primary air filter closed fully or partially?

I know that when the carburetor heat knob is fully opened, the primary air filter is closed. But what happens to the primary filter when carburettor heat is partially open? Is the primary filter ...
11 votes
2 answers
2k views

How can ice form in an OAT of +20°?

According to a question that I came across while studying for my EASA exam on Aircraft General Knowledge, "icing" is most likely to happen in an OAT between "Between -5°C and +20°C"...
8 votes
3 answers
1k views

Why is icing more critical on smaller airplanes?

My professor mentioned that the contour of smaller airplanes changes more drastically than that of larger airplanes. In this context, he mentions the surface-to-volume ratio. But how does that relate ...
0 votes
0 answers
33 views

does ice accumulation of wing affect its flutter speed

I am trying to find a possible link between wing icing and flutter. I want to know if ice accretion mass will change aeroelastic properties of the wing. Does wing icing affect the flutter speed of ...
3 votes
2 answers
158 views

Will ice on an airfoil work as a vortex generator?

Vortex generators are little fans that generate vortex to attach flow to an airfoil and delay stall. If frost or ice are formed on an airfoil, technically they also generate turbulence and vortex,I am ...
0 votes
1 answer
227 views

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. ...
3 votes
2 answers
565 views

What is the reasoning behind this question about the correct altitude to avoid clear icing?

This question has been killing me for a while and it's an original PPL question: You are approaching to an airmass with a temperature of 6 C at 10000ft. Which altitude should you be in order to avoid ...
10 votes
4 answers
4k views

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 above the level ...
6 votes
2 answers
567 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 ...
6 votes
2 answers
1k views

What is considered to be a flight into known Icing?

I am aware that flight into known icing is prohibited if your aircraft is not suitable to fly in icing conditions (unless e.g.: FIKI,...). Given the following example I am wondering if it would be ...
4 votes
3 answers
2k 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 ...
3 votes
4 answers
178 views

Do icing limits exist for parked aircraft?

Are there any aircraft that have a limit on the amount of ice or snow that can be on the aircraft when stationary and on the ground?
41 votes
6 answers
10k views

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 ...
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 ...
8 votes
1 answer
670 views

Why is the Tu-204 virtually immune to wing and tail icing?

Atmospheric icing is extremely hazardous to heavier-than-air aircraft, as it badly disrupts their ability to generate aerodynamic lift (the inherent roughness of accreted ice encourages the airflow to ...
1 vote
1 answer
102 views

Deicing Rod for Propellers

Similar to a card hitting the spokes of a bicycle, the card is soft enough to knock the dust off the spokes with no damage. What material would be best to impede the propellers to chip off the ice. ...
3 votes
4 answers
2k 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 ...
6 votes
2 answers
2k views

Do helicopter rotors have anti-ice systems like propellers and wings?

Icing disrupts the aerodynamic qualities of wings and props, is there a similar danger with helicopter rotors? Are there de-icing systems to prevent this?
20 votes
3 answers
4k views

Why are propellers de-iced before the engines are started, and does ice on the fuselage affect the flight characteristics of the plane?

I recently flew on a flight out of Montreal on a DHC8 turboprop. The plane had been parked at the airport overnight during a winter storm, and as I walked out to the plane, there were visible icicles ...
3 votes
0 answers
229 views

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

Snow and ice buildup on airplanes (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 ...
4 votes
1 answer
378 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?
3 votes
1 answer
115 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....
2 votes
2 answers
640 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 ...
14 votes
3 answers
6k views

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 ...
5 votes
4 answers
5k 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 ...
1 vote
4 answers
1k 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 ...
19 votes
1 answer
3k views

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 ...
8 votes
1 answer
380 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 ...
10 votes
6 answers
21k views

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 ...
3 votes
2 answers
8k 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 ...
1 vote
1 answer
156 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 ...
-1 votes
1 answer
173 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.
0 votes
1 answer
86 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?
18 votes
3 answers
19k 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 ...
7 votes
2 answers
2k views

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 ...
1 vote
1 answer
954 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?
15 votes
2 answers
3k 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 ...
1 vote
1 answer
683 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 ...
8 votes
1 answer
2k 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 votes
2 answers
291 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 ...
12 votes
2 answers
561 views

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?
14 votes
3 answers
7k views

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 ...
10 votes
3 answers
2k views

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 ...
3 votes
1 answer
946 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 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 ...
4 votes
1 answer
645 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: ...
6 votes
2 answers
804 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 (...