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  1. Small Turbine Engines - PBS Aerospace

  2. Auxiliary power unit - Wikipedia

  3. RE100 Auxiliary Power Unit - Honeywell Aerospace

  4. how it works: auxiliary power unit (APU) - Greg Brown's Flying …

  5. What is the Auxiliary Power Unit (APU)? - Flightradar24.com

  6. How an Auxiliary Power Unit Works - FLYING Magazine

  7. Auxiliary Power Unit (APU) - SKYbrary Aviation Safety

  8. Honeywell Designs APU for Small Jets, Turboprops | AIN

  9. What Is An APU? - Simple Flying

  10. What Is an APU on an Airplane? Everything You Need to Know

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