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Chapter 4-1

Auxiliary Power Unit

QuestionAnswer
1. The APU is equipped with a dedicated FADEC. (T / F) a) True
2. When are electrical and pneumatic loading available during an APU start ? a) APU has reached 95 % RPM plus 3 seconds. b) APU icon is available on the ELEC synoptic page.
3. During the normal shutdown sequence APU bleed air is immediately removed and electrical power is removed after a 1-minute cooldown period, followed by a spooldown period. (T / F) a) True
4. In flight the APU automatically shuts down for: a) F - FADEC critical fault b ) O - Overspeed c ) U- Underspeed
5. What is the APU used for? a) Electrical and Bleed Air
6. What monitors and controls the APU? a) Its own dedicated FADEC
7. How are the batteries 1 and 2 used for APU start? a) BATT 1 powers the FADEC and EICAS for monitoring b) BATT 2 powers the APU START bus
8. Is battery 1 necessary to start the APU? a) Yes, battery 1 powers the APU FADEC
9. How many batteries are required for normal APU start? a) 2
10. Which is the fuel source for the APU? a) Right Fuel Tank or Left Fuel Tank through the Crossfeed Valve
11. Which Fuel Pump is used for APU Start with Batteries ON Only? a) DC Fuel Pump
12. Which Fuel Pump is used for APU Start with an AC powered aircraft? a) AC Fuel Pump 2
13. Which Fuel Pump is used for APU Start with only the Right Engine Running? a) Right Ejector Fuel Pump
14. Will the APU shut down automatically if the APU fails to start within the normal start cycle time? a) Yes
15. What does moving the APU Selector Knob to OFF do? a) Initiates a normal APU shutdown with a 1 - minute cool down followed by a spooldown period b) Pneumatics are removed immediately and electrical power is removed after the 1 minute cool down
16. Can the APU Pneumatics be used during the cool down period? a) No
Created by: lglippig
 

 



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