1. Ground Deicing: This method is carried out before the aircraft takes off, typically at the airport's deicing facility. It involves spraying a heated mixture of glycol and water onto the aircraft surfaces to melt the ice. The fluid spreads evenly and prevents ice from forming again for some time. Ground deicing is generally used when the aircraft is parked and there's enough time for thorough treatment.
2. Pre-Flight Deicing: This is done when the aircraft is about to depart, and the deicing process must be quick and effective. Hot water or heated glycol mix is sprayed onto the plane using high-pressure systems, which helps melt the ice rapidly. Pre-flight deicing is usually combined with anti-icing measures to prevent ice from accumulating during takeoff.
3. In-Flight Deicing: In some cases, the aircraft encounters ice buildup during flight, particularly through areas with freezing precipitation or supercooled water droplets. To address this, aircraft are equipped with anti-icing systems. These systems may use heated surfaces, such as leading edges of the wings and engine cowlings, to prevent ice from forming. Some aircraft also have pneumatic boots or systems that vibrate to break off the ice.
4. Portable Deicing Equipment: Airport ground crews may also use portable deicing equipment to treat specific areas of an aircraft, particularly if ice accumulates in hard-to-reach sections like the tail or horizontal stabilizers. These portable systems use pressurized heated air, glycol sprayers, or other methods to remove the ice.
The specific deicing methods used may vary based on the aircraft type, weather conditions, and airline procedures. Additionally, anti-icing treatments are often applied along with deicing measures to prevent new ice from forming and ensure safe flight operations.
