<p>Have you ever been in a hot and stuffy airplane and you heard the pilot apologize because the APU wasn't working? Have you ever been onboard and all the lights went out for a few seconds?  So what is an APU? What is a GPU?  Captain Al Explains all about the Auxiliary Power Unit and the Ground Power Unit, how they differ and what happens when they don't work as intended.</p>

Have you ever been in a hot and stuffy airplane and you heard the pilot apologize because the APU wasn't working? Have you ever been onboard and all the lights went out for a few seconds? So what is an APU? What is a GPU? Captain Al Explains all about the Auxiliary Power Unit and the Ground Power Unit, how they differ and what happens when they don't work as intended.

<p>Have you ever been in a hot and stuffy airplane and you heard the pilot apologize because the APU wasn't working? Have you ever been onboard and all the lights went out for a few seconds? &nbsp;So what is an APU? What is a GPU? &nbsp;Captain Al Explains all about the Auxiliary Power Unit and the Ground Power Unit, how they differ and what happens when they don't work as intended.</p>

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Airplane APUs & GPUs - What are they? How do they work?

Airplane APUs & GPUs - What are they? How do they work?