# Questions tagged [icing]

72 questions
Filter by
Sorted by
Tagged with
1 vote
605 views

### Did Concordes have de-icing boots?

Concordes were a supersonic passenger aircraft of which only 20 were built from 1965 to 1979 and were retired in 2003 for expense reasons and non-fuel efficiency. The plane was placed into regular ...
239 views

### What are the Cessna 172 carburetor icing chart data points?

I am looking for the polynomial equations (functions) for each of the curved lines. I have been looking online and I am unable to find the formulas and the data points for this chart (Cessna 172). I ...
184 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, ...
336 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 ...
• 2,227
363 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 ...
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"...
• 397
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 ...
• 111
37 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 ...
165 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 ...
• 31
320 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. ...
• 119
2k 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 ...
• 835
184 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?
• 3,343
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 ...
• 17.8k
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 ...
• 17.8k
1 vote
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. ...
• 1,058
786 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 ...
• 28.4k
3k 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?
• 20.6k
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 ...
• 1,722
723 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 ...
472 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?
• 8,882
129 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....
• 6,984
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 ...
• 145
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 ...
• 1,569
738 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 ...
• 497
235 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 ...
• 28.4k
1 vote
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 ...
9k 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 ...
• 133
1 vote
158 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 ...
• 572
188 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.
91 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?
• 17
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
1k 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?
• 8,559
1 vote
723 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 ...
• 8,559
296 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 ...
• 31
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 ...
• 13.3k
1k 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 ...
• 7,565
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 ...
• 2,791
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 ...
• 3,688
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 ...
• 2,770
693 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: ...
• 9,002
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 ...
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 ...
• 6,793
840 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 (...
• 61
601 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 ...
• 6,028
2k 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?
• 11.4k
388 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 ...
• 16.6k
1k 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 ...
• 75.3k
2k 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?
• 2,218
913 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 ...
• 8,476