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Chapter 4-2

Auxiliary Power Unit

QuestionAnswer
17. Can the APU electrical power be used during the cool down period? a) Yes
18. If you need the APU 50 seconds into a shutdown, is there a way to get its use back? a) Yes, turn the APU Master switch to ON
19. Can the APU shutdown be cancelled? a) Yes, by moving the APU Master switch to ON before the 1-minute cool down is over
20. How can the APU be shut down immediately? a) Push in the guarded APU EMER STOP Button b) No 1 minute cool down period
21. What conditions will the APU automatically shutdown for on the Ground? U - Under speed F - FADEC Critical Fault O - Overspeed then S - Sensor fail H - High oil temperature E - EGT overtemperature L - Low oil pressure F - Fire
22. When does the Red Bar on the APU EMER STOP Button illuminate? a) APU Fire is Detected
23. What happens when the APU EMER STOP Button is Pushed IN? a) The APU Fuel Shutoff Valve Closes and the APU will shutdown with no cooling period. b) U - Underspeed F - FADEC Critical Fault O - Overspeed then S - Sensor fail H - High oil temperature E - EGT overtemperature L - Low oil pressure F - Fire
24. Does the cool down period apply to the APU EMER STOP Button? a) No
25. In normal operations on the ground with the APU running it would be normal to see the fuel unbalanced with less fuel in which tank? a) Right Tank
26. What is the altitude limit for an APU start? [SOP Limitation] a) 30,000 ft
27. The operational altitude limit for the APU is? [SOP Limitation] a) 33,000 ft
28. What is the APU operational limit for bleed? [SOP Limitation] a) 15,000 ft
29. What is the APU operational limit to assist an engine start? [SOP Limitation] a) 21,000 ft
Created by: lglippig
 

 



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