Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
How many pack(s) does the APU supply bleed air to in flight and on the ground? |
Both packs during ground operations AND One pack inflight |
|
|
Is the APU capable of powering both transfer buses inflight? |
Yes |
|
|
If AC and DC pumps are not operating how does the APU get its fuel? |
Suction fed from tank 1 |
|
|
When the AC fuel pumps are operating where does the fuel come from? |
Left side of the fuel manifold |
|
|
Where does the Power come from to start the APU? |
Main battery or No1 transfer bus |
|
|
Does the battery switch need to remain on to operate the APU? |
Yes otherwise power is lost to the electronic control unit (ECU) |
|
|
When the APU is ready to provide bleed air or electrical load what indication is seen in the cockpit? |
APU GEN OFF BUS light illuminates |
|
|
How long can it take to start the APU? |
2 minutes |
|
|
How long does the APU need to operate before using it as a bleed air source? |
2 minutes |
|
|
What happens when you switch the APU off? |
Trips the APU generator and closes APU Bleed valve. It will shutdown in 60 seconds |
|
|
When will the APU automatically shutdown? |
Low oil pressure Fault detected by ECU Overspeed APU fire Battery switch OFF |
|
|
How would you extend APU fuel control unit service life if AC power is being used? |
Turn on an AC powered fuel pump |
|
|
How long does it take to open the APU door? |
20 seconds |
|
|
What is minimum battery voltage to start the APU? |
23 volts |
