Anonymous
Anonymous asked in Cars & TransportationAircraft · 1 decade ago

De-icing an airplane?

What do they spray it with?

Wht don't they spray th tail?

What if it freezes again in the air? Or does it not freeze because the air is too dry? But what if it freezes during landing?

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  • 1 decade ago
    Best Answer

    Airplanes are deiced with glycol. For anti-icing, a thicker glycol is used that is meant to stay on the surfaces to keep precipitation from freezing on the wings.

    They do spray the tail.

    The fluid is designed to flow off of the wing as the airplane reaches takeoff speeds. By the time the plane lifts off, the wings and tail are virtually clean of both ice and deice fluid. Once the plane is in the air traveling a couple hundred miles an hour, precipitation will not accumulate on top of any surfaces. Only the leading edge of the airplane's surfaces will accumulate snow or ice. The airplane's systems heat these surfaces to prevent ice from forming.

    Snow may accumulate on the surfaces of the airplane after landing, but that's ok when it's on the ground. It will just be deiced again before the next takeoff to get rid of any accumulation and protect the surfaces until the plane is in the air again.

  • Anonymous
    1 decade ago

    They spray parts what will collect ice, and parts that are "lifting surfaces" -- the wings the horizontal tail. The Vertical tail doesn't collect a lot of ice typically.

    When the airplane is in the air, it won't collect a lot of ice except for the "leading edges" and those parts are heated surfaces in jets, and will then not collect ice.

    During landing is usually too short of a time for the airplane to collect that much ice, and the heated leading edges will protect it.

    It's sprayed with a sticky mix of hot water and the deicing chemicals which is glycol.

    Some aircraft are equipped with "boots" which is an inflatable rubber device on the front of the wing. When it collects ice it's inflated and it cracks the ice off the leading edge of the wing.

    Other aircraft are equipped with a "tks" system which is also called a "weeping wing" where a porous surface exists on the leading edge of the wing, and deicing fluid is forced through it, and it helps clear the wing of ice.

    An older aircraft I have seen, the Avro Shackelton, has a system like the TKS system, but the leading edges of the wing are covered with a thin wood veneer, and the glycol is pressurized behind it. (Really cool.) Unfortunately, the pictures in the article below don't show this feature.

    http://en.wikipedia.org/wiki/Avro_Shackleton

    There's additional information here, that you should find interesting.

    http://en.wikipedia.org/wiki/Ice_protection_system

  • Anonymous
    1 decade ago

    They spray a solution with alcohol and they spray the tail too.

    For airline plane they spray before takeoff and its gonna be effective for 20-30 minute after airborne. Cant freezes again because the airplane fly too high (say FL600) and there is no moisture at that altitude.

    During landing if the weather reports ice they use a DE-ICE system that preheat the edge of the wing and impennage avoiding the formation of ice.

    Source(s): commercial pilot
  • jj
    Lv 6
    1 decade ago

    I work for an airport ground handling company that does de-icing. We use Kilfrost ABC 2000 type II fluid. It is a Monopropylene glycol based fluid.

    It is mixed 75% fluid 25% water and heated to 85ºC for deicing aircraft. It is the heat rather than the fluid that does the deicing. It clings to the surface of the aircraft and provides a "hold over" time before ice will begin to form. The hold over time depends on air temperature and precipitation if any. ie rain snow hail etc. Neat, unheated fluid is used after initial deicing if longer hold over times are required.

    We do spray the tail. We spray wherever we are directed to by captain or engineers. This can include top and underside of wings, tail planes and stabiliser, and even the fuselage (body) of the aircraft if it is heavily frosted or covered in snow. Windows are not sprayed directly but fluid can be allowed to run over them. In takes for APU and Air conditioning need to be avoided as well as external sensors.

    The fluid is designed to slick of the aircraft as it travels down the runway before takeoff. Once above cloud cover the air is normally too dry to allow ice to build up. Some aircraft (propeller driven) fly where air is moist and ice can build up on the leading edge which is fitted with expanding rubber sections which can be inflated to crack any ice and break it off. Other aircraft I believe have heating elements that can be used.

    An aircraft flying at altitude gets very cold and ice can build up during the approach for landing but it's not enough to have a detrimental effect as not much builds up.

    Source(s): Deicing aircraft for seven winters.
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  • DT3238
    Lv 4
    1 decade ago

    For large airplanes, the wing leading edge is actively protected once ice is removed on the ground by routing hot engine air through ducts to heat the slats and the engine inlet- this is called thermal anti-ice. The 787 won't have bleed air, so only the engine will be protected with hot air- the slats have electric surface heat.

  • bebout
    Lv 4
    3 years ago

    you would be able to desire to specify on the floor or interior the air are you conversing approximately piston powered a/c of turbine powered. in case you're piston powered then you definately will maximum possibly use deicing boots that are expandable boots suited for the wing top edges and inflated with compressed air. in case you're turbine powered then you definately would be utilising warm compressor air in ducting at the back of the wing creative.

  • Anonymous
    1 decade ago

    1.http://en.wikipedia.org/wiki/Deicing

    2. They do spray tail not alot

    3. It shouldn't freeze its a protective coat

    4. If it freezes during landing then bumpy landing or crash, That is never going to happen.

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