APU

Question 1

If the APU fuel pump fails prior to APU start, the:

• Left Tank Aux pump provides fuel boost pressure
• APU starts and continues normal operation
• APU rpm fluctuates
• ESU will prevent the APU from starting

Answer 1

• ESU will prevent the APU from starting

Question 2

APU automatic shutdown will occur when the Battery Master switch is in the “Battery Master” position and any one of the following events occur: (There may be more than one correct response)

• APU Fire
• Rearbay overheat
• When the aircraft becomes airborne
• APU Overspeed

Answer 2

• APU Fire
• Rearbay overheat
• When the aircraft becomes airborne
• APU Overspeed

Question 3

APU Fire protection:

• Is provided by one fire extinguisher automatically, provided the battery master switch is in the “Battery Master” position
• Is provided by one fire extinguisher automatically with a manual backup
• Is provided by one fire extinguisher automatically, provided the battery master switch is in the “Battery Master” position with a manual backup
• Is provided by two fire extinguishers and must always be manually activated

Answer 3

• Is provided by one fire extinguisher automatically, provided the battery master switch is in the “Battery Master” position with a manual backup

Question 4

Fire deck indications of an APU fire are: (there may be more than one correct answer)

• “FIRE” warning light on the APU fire protection panel (overhead)
• Illumination or both glareshield “ENGINE FIRE PRESS TO RESET” push lights
• Fire bell
• “APU” caution light and “CHECK FIRE DET” warning light

Answer 4

• “FIRE” warning light on the APU fire protection panel (overhead)
• “APU” caution light and “CHECK FIRE DET” warning light

Question 5

The APU fuel supply is:

• Supplied from the left fuel tank collector bay, under gravity pressure to the APU boost pump
• Independent of the main fuel tank system
• Supplied from the left fuel tank collector bay, under gravity pressure to the APU
• Supplied by the right tank boost pump

Answer 5

• Supplied from the left fuel tank collector bay, under gravity pressure to the APU boost pump

Question 6

The APU start circuits are armed when the:

• FLR light goes off
• START switchlight is pushed
• APU PWR switchlight is pushed and controlled by the ESU
• APU PWR switchlight is pushed and controlled by the started gen GCU

Answer 6

• APU PWR switchlight is pushed and controlled by the ESU