What is the purpose of a plenum on an APU?

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Study for the Aviation Maintenance Technician, Second Class (AMT2) Exam. Use flashcards and multiple choice questions, with hints and explanations provided for each question. Prepare for success!

Multiple Choice

What is the purpose of a plenum on an APU?

Explanation:
The plenum on an APU serves to provide a steady source of air at positive pressure to the compressor by collecting and smoothing the intake flow as ram air enters the engine. This helps ensure adequate mass flow and stable pressure across operating speeds, reducing the risk of compressor surge during startup and rapid throttle changes. It’s not used for oil cooling, isn’t the exhaust path, and doesn’t store air for emergencies.

The plenum on an APU serves to provide a steady source of air at positive pressure to the compressor by collecting and smoothing the intake flow as ram air enters the engine. This helps ensure adequate mass flow and stable pressure across operating speeds, reducing the risk of compressor surge during startup and rapid throttle changes. It’s not used for oil cooling, isn’t the exhaust path, and doesn’t store air for emergencies.

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