FAA Powerplant Written Practice Test

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Prepare for the FAA Powerplant Written Test. Study with flashcards and multiple choice questions, each featuring hints and explanations. Ace your exam with confidence!

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What is the primary substance used in fluid anti-icing systems for propellers?

Water
Isopropyl alcohol
Ethylene glycol
Propylene glycol

The correct answer is: Isopropyl alcohol

In fluid anti-icing systems for propellers, isopropyl alcohol is commonly used due to its effective freezing point depression properties. It has a relatively low freezing point, making it suitable for preventing ice accumulation on propeller surfaces during flight, where such accumulation can severely affect performance and safety. Isopropyl alcohol also provides rapid evaporation, which helps in drying off moisture during operation. This feature is critical in maintaining the effectiveness of the anti-icing system, ensuring that the propellers remain free of ice build-up, thereby enhancing aerodynamic efficiency and performance in cold weather conditions. While other substances might also be used in anti-icing solutions, isopropyl alcohol stands out for its specific effectiveness in fluid systems tailored for propeller anti-icing applications.