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!

Practice this question and more.

What purpose does a blast tube serve in aircraft reciprocating engines?

To increase oil flow
To cool an engine accessory
To lubricate moving parts
To filter incoming air

The correct answer is: To cool an engine accessory

A blast tube plays a crucial role in the cooling of engine accessories. In aircraft reciprocating engines, various components, such as magnetos, fuel pumps, and other accessories, can generate significant amounts of heat during operation. The blast tube directs a stream of cooling air over these components, preventing them from overheating and ensuring their proper functioning. By maintaining lower temperatures, the blast tube helps to enhance the reliability and longevity of engine accessories. This cooling method is particularly important because many of these accessories are located in areas where natural airflow may be insufficient. The use of a blast tube mitigates the risk of thermal damage and maintains optimal operating conditions.