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Icing on UAVs is a global phenomenon, and icing conditions at the operational altitude can occur year round around the world. However, icing risks are particularly big in the sub arctics, Arctic and Antarctic. In large parts of the Nordics, for example, icing conditions are present from 35% to more than 80% of the time from September through ...
The use of deicing boots may enable an aircraft to be certified for flight into known icing conditions. However, they may not be sufficient to handle extremely severe icing, where ice can accumulate faster than the boots can shed it, or it accumulates on non-booted surfaces to the point where there is a dangerous loss of lift or control, or ...
Ice buildup can change the shape of airfoils and flight control surfaces, degrading control and handling characteristics as well as performance. An anti-icing, de-icing, or ice protection system either prevents formation of ice, or enables the aircraft to shed the ice before it becomes dangerous.
De-icing fluids containing thickeners (types II, III, and IV) are also known as anti-icing fluids, because they are used primarily to prevent icing from re-occurring after an initial deicing with a type I fluid. TKS fluid is similar to type I fluid and is used by in-flight TKS ice protection systems. [5]
American Eagle Flight 4184, officially operating as Simmons Airlines Flight 4184, was a scheduled domestic passenger flight from Indianapolis, Indiana, to Chicago, Illinois, United States. On October 31 , 1994, the ATR 72 performing this route flew into severe icing conditions , lost control and crashed into a field, killing all 68 people on ...
Aero Caribbean Flight 883; Aero Trasporti Italiani Flight 460; Air Algérie Flight 5017; Air Canada Flight 646; Air Florida Flight 90; Air France Flight 447; Air Ontario Flight 1363; American Airlines Flight 63 (October 1943) American Eagle Flight 4184; Arrow Air Flight 1285R
The deicing process must take this into account to ensure that the aircraft remains free of contamination until it takes off. Typically this involves adding a viscous "anti-icing" fluid which will remain on the wings and immediately melt falling snow. The time between deicing/anti-icing treatments and take-off is called the "holdover time".
A prohibited airspace is an area (volume) of airspace within which flight of aircraft is not allowed, usually due to security concerns. It is one of many types of special use airspace designations and is depicted on aeronautical charts with the letter "P" followed by a serial number.