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

The props are done before starting because you need to make sure the blades and spinners are fully cleaned off while they are stationary. Otherwise, they'd vibrate like hell when starting and shed ...
John K's user avatar
  • 132k
31 votes

Do missiles need anti-icing?

In a history of NASA's Icing Research Tunnel, "We Freeze to Please," NASA SP-2002-4226, Fig. 5-2 shows Hellfire missiles being tested. But it conspicuously mentions nothing about de-icing ...
Camille Goudeseune's user avatar
21 votes
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What's required for a plane certified to fly to Antarctica?

I'm not aware of any specific 'certification' for aircraft operating to/from Antarctica. The air operations to/from Antarctica varies greatly depending on the location of the airstrip and season. ...
aeroalias's user avatar
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20 votes
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How can ice form in an OAT of +20°?

EASA produced a pamphlet for GA Piston Engine icing. It states: Carb icing is not restricted to cold weather. It will occur on warm days if humidity is high, especially at low power settings. Flight ...
Mark Jones Jr.'s user avatar
16 votes
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What does the word "boot" mean?

Versalog already told the core of the thing. Most prop aircraft which are approved for flights into known icing conditions have such boots to remove the ice from the wings leading edge. Those boots ...
pcfreakxx's user avatar
  • 1,988
14 votes

How can ice form in an OAT of +20°?

Water cannot exist in solid form at a temperature of 20°C and at pressures in the order of 1 atm. That question is most definitely talking about carburettor icing. Within a carburettor, temperatures ...
Aditya Sharma's user avatar
13 votes

Do missiles need anti-icing?

Do missiles need anti-icing? Apparently not, because they have no provision for that. At least none of the USAF/NATO missiles I've ever seen. And it wouldn't be just missiles, but bombs as well. The ...
WPNSGuy's user avatar
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12 votes
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When to climb and when to descend when faced with icing?

While there may be guidelines as to whether to climb or descend when you're icing at your current level, individual pilots that I have known varied widely in the specifics of what they would do ...
Terry's user avatar
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12 votes

What does the word "boot" mean?

Find a picture of any WWII bomber or any modern Cessna Caravan and there should be a black stripe along the leading edge of the wing and tail surfaces. That is termed a boot. (Image source) ...
Versalog's user avatar
  • 129
12 votes

Is it safe to takeoff with some ice and snow on the wings?

It appears that there was a considerable amount of contamination, either snow, ice, frost, or a mix thereof, on the wing when the takeoff roll started, and that is not considered safe under any ...
Ralph J's user avatar
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11 votes
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What is the risk of icing with water / moisture on wings prior to takeoff?

Taking off with wet wings is not a problem, the airflow is going to blow the water off long before it reaches the freezing point. There's no concerns here. Given the scenario what I would be ...
GdD's user avatar
  • 54k
11 votes

What are some Anti-icing solutions for small planes without an on-board system?

There are many things you can do to mitigate the risk of icing, but most involve prevention via avoidance of icing conditions. For example, getting a good weather brief, knowing where the freezing ...
Michael Hall's user avatar
  • 26.9k
11 votes

What are some Anti-icing solutions for small planes without an on-board system?

Generally light GA aircraft have limited anti ice system, usually limited to just pitot heat. Some newer aircraft have been certified for flight into known icing (FIKI) and make use of chemical ...
Romeo_4808N's user avatar
  • 74.1k
10 votes

Why is icing more critical on smaller airplanes?

There'a value when discussing airframe icing called "collection efficiency". It's the proportion of supercooled droplets in given package of air that will penetrate the boundary layer of air ...
John K's user avatar
  • 132k
9 votes
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Does the AC-130 have de-ice or anti-ice protection for wings and surfaces?

The C-130 uses pressurized bleed air for leading-edge and window anti-ice. The props are deiced with electric heaters in the prop. Source The C-130 is very often used in places that experience icing....
Ron Beyer's user avatar
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9 votes

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

Yes, a low powered trainer can fly through tall mountains. It is not possible to say how often the flight may be made safely as it depends on specific weather conditions across your route of flight. ...
acpilot's user avatar
  • 6,016
9 votes

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

Just like Teslas, being designed in California, perform worse in ice and snow than Volvos, Russian airplane designers pay more attention to icing than Western ones, where efficiency is paramount. And ...
Peter Kämpf's user avatar
8 votes
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Why is carburetor heat unnecessary at full throttle?

The icing you are talking about is called "throttle ice" and actually just forms around the edges and back side of the throttle butterfly. It's not really related to the venturi that is upstream; it'...
John K's user avatar
  • 132k
8 votes

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

Yes, helicopter blades are no different from wings and propellers when it comes to ice, and there exist rotor de-ice and anti-ice systems for helicopters that require the ability to fly in known icing ...
AEhere supports Monica's user avatar
8 votes
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Are pitot systems protected from ice?

You can see an example sketch of a heated pitot tube in the FAA Handbook of Aeronautical Knowledge: As you can see, there are two heaters that heat the entire tube and (ideally) stop ice from forming ...
Bianfable's user avatar
  • 56.5k
7 votes

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

I have most of my 2500hrs in Alaska and they use a very good rule of thumb. Always climb first while you are able to do it, if the situation gets worse, you are going to find out what the condition is ...
jwzumwalt's user avatar
  • 11.5k
7 votes
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Why does pitot tube freeze at an altitude whose temperature is way below the freezing point?

First, AF 447 was flying into the top of a tropical storm. The air was much more humid and warmer than that of the standard atmosphere. Next, in the absence of seed crystals or nuclei, water vapour ...
Peter Kämpf's user avatar
7 votes
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What is the reasoning behind this question about the correct altitude to avoid clear icing?

The definition for icing conditions is visible moisture at a TAT of less than 10°C. From the Boeing 737 NG FCOMv1 (SP.16.1 Supplementary Procedures - Adverse Weather): Icing conditions exist when OAT ...
Bianfable's user avatar
  • 56.5k
7 votes

Do missiles need anti-icing?

No, for mostly the same reasons that fighters don't have specific provision for such systems: altitude, weight and complexity/failure rates. Altitude: icing conditions are only encountered within a ...
Ian Kemp's user avatar
  • 304
7 votes

Will ice on an airfoil work as a vortex generator?

No. A vortex generator protrudes up into the free stream, and the horizontal tornado it creates circulates partly in the free stream and partly in the turbulent boundary layer. Spiralling free stream ...
John K's user avatar
  • 132k
6 votes

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 ...
Skip Miller's user avatar
  • 10.3k
6 votes
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How was the "frozen wing flap grease" problem solved? (Antarctica, 2001 emergency evac)

Flying with the flaps extended is perfectly possible, just inefficient. At that point they were probably just trying to get in the air, not worrying about their fuel efficiency or airborne speed. ...
Tyler Durden's user avatar
  • 13.3k
6 votes
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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?

Those hot plates, in my experience, are useless. The only reason we had one on our PA34 cargo plane was to make it legal for flight into known icing. As far as I'm concerned, the whole and entire ...
acpilot's user avatar
  • 6,016
6 votes
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Why is a small amount of smooth ice over the top of the wing more dangerous than an accumulation on the leading edge?

This seems to be from an older Gleim study guide. It references a now-cancelled AC 91-51A: (AC 91-51A) Ice on the leading edge, while seemingly more dangerous, can be removed using deicing systems....
Steve V.'s user avatar
  • 23.3k
6 votes

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

Ice flying off the propellers can damage something, or someone. Also unbalances the propeller assembly overall, leading to vibrations. Little bit of ice left on the fuselage is not bad, only causes ...
CrossRoads's user avatar
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