What is the general procedure for applying de-ice/anti-ice fluid on an aircraft?

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Applying de-ice/anti-ice fluid follows a clear sequence: treat all surfaces that affect aerodynamics and safety per the aircraft manufacturer and local airport procedures, covering all critical surfaces such as wings, tail surfaces, control surfaces, engine inlets, and sensors. The process starts with removing existing contamination (de-icing) and then applying anti-icing fluid to create a protective film that lasts for a defined holdover time. You must observe the holdover time specified for the fluid under the current weather conditions to ensure protection until takeoff. Avoid runback by applying in a way that keeps fluid on the surfaces and prevents it from draining back onto clean areas or into engine intakes. Do not apply after engines are started, and don’t skip procedures just because it’s sunny—local procedures and fluid choice govern how long protection lasts and when reapplication is needed.