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Flashcards in APU Deck (13):
1

What kind of APU is on the Aircraft?

Sundstrand APS 2300

2

Describe the APU

-Constant speed drive
-Single stage impeller with a stage 2 axial-flow turbine
-Independent Oil system

3

What controls the APU?

A dedicated FADEC

4

What battery is used for APU start?

-BATT 2 powers the starter
-BATT 1 powers the FADEC and EICAS for monitoring

5

What is the fuel source for the APU?

-Right Fuel Tank
-Left Fuel tank through the crossfeed valve

6

What fuel pump is used for APU Start?

Batteries 'ON' only - DC fuel pump in right tank
AC powered airplane - ACMP 2
Right Engine running - Ejector fuel pump

7

Will the APU shutdown automatically if speed and acceleration rate isn't reached in starting cycle time?

yes

8

What does moving the APU start switch to OFF do?

-Initiates normal APU shutdown
-1 minute cool down
-No pneumatics (electrics for 1 minute)

9

Can the APU shutdown be cancelled?

Yes, by moving the START switch back to ON beofre the 1 minute cool down is over

10

How is the APU shutdown immediately?

-APU emergency stop button
- No 1 minute cool down period

11

What will happen if batteries are turned OFF during the 1 minute cool-down period?

APU will shutdown immediately

12

When will automatic shutdown of the APU occur?

Ground
-Over/Under speed
-FADEC Critical fault
-Fire
-EGT Overheat
High/Low oil pressure
-Sensor Fault
Flight
-Over/Under Speed
-FADEC critical fault

13

Can the APU be started after a critical fault?

No