Aviation Maintenance Technician Series Powerplant textbook ASA Chapter 13
Aviation Maintenance Technician Powerplant FAA-H-8083-32 Vol. 2 FAA Chapter 8
1. Where are most APUs located in modern jet transport aircraft?
In the tail cone of the fuselage.
2. What is the function of an APU?
An APU provides electric power and compressed air when the main engines are not operating.
3. What are two sources of compressed air from an APU?
From bleed air from the APU turbine compressor, or from a load compressor driven by a free turbine in the engine.
4. Where in maintenance information based on the ATA-100 system would you find instructions for inspecting and servicing the engine of an airborne APU?
In section 49 20.
5. How is most of the troubleshooting done for a modern APU?
By the fault codes generated by the FADEC.
This subject may be tested at the same time as Turbine Engines. No further testing of auxiliary power units is required.