APU

Question 1

Where does the APU get its fuel?

Answer 1

• AC power AVAIL: Main tank 2, Pump 2 AFT

AC power not AVAIL: DC pump in Main tank 2

Question 2

How can I tell if the APU is running?

Answer 2

• EICAS status msg “APU RUNNING”
• APU GEN “AVAIL” light
• Line of APU info on STAT page

Question 3

Can I start the APU in flight?

Answer 3

No

Question 4

Can the APU be operated in flight?

Answer 4

Yes (pneumatics up to 15,000ft)

Question 5

Can I use the APU generators in flight?

Answer 5

No

Question 6

What does the APU gen AVAIL light indicate?

Answer 6

APU generator power is acceptable

Question 7

With #1 and #2 APU AVAIL light illuminated, what bus is being powered?

Answer 7

#1- Ground Handling Bus
#2- Main Deck Cargo Handling Bus

Question 8

What are some of the items on the Ground Handling Bus?

Answer 8

• Lower Cargo Handling and Lights
• Fueling System
• Aux. HYD pump 4

Question 9

On the secondary EICAS check, what quantities are you looking for?

Answer 9

HYDs- .80
O2- 1200
APU Oil- .55
Eng. Oil- 16 qts

Question 10

When will the APU automatically shut down?

Answer 10

whenever a parameter is exceeded