Anti-icing fluids are usually a mixture of about 85-percent alcohol and 15-percent what?

Enhance your skills for the Aviation Machinist’s Mate (AD) Test. Use flashcards and multiple-choice quizzes with hints and explanations. Prepare effectively!

The correct answer is that anti-icing fluids are usually a mixture of about 85-percent alcohol and 15-percent water. This combination is effective for preventing ice formation on aircraft surfaces, particularly during winter operations and in icy conditions.

Alcohol has a lower freezing point than water, which helps in creating a mixture that can prevent ice from forming. The water component helps in diluting the alcohol to a usable consistency while providing additional frost protection under certain conditions.

While glycerin, ethylene glycol, and propylene glycol are all substances that can be involved in various de-icing and anti-icing applications, they are not commonly combined with alcohol in the typical anti-icing fluid used for aircraft. Ethylene glycol and propylene glycol are more often associated with antifreeze solutions but differ in their applications and effects when mixed with alcohol for anti-icing. Glycerin, although it may have some antifreeze properties, does not serve the same purpose in maintaining low viscosity and effective ice prevention as the correct mixture does. Therefore, the most effective anti-icing fluid is that which combines alcohol and water in the specified ratio.

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