APU Flashcards
1
Q
What is the maximum EGT limit when starting the APU?
A
974 C
2
Q
What is the minimum APU battery voltage required for APU start?
A
22 volt
3
Q
What is the minimum main battery voltage required for APU start?
A
22 volt
4
Q
How many stages of compression does the APU?
A
a single stage centrifugal
5
Q
What is the main purpose of the APU?
A
electrical power
6
Q
What is the purpose of the APU load control valve?
A
- LCV controls output of 10th stage
- regulate bleed air to maintain 100% RPM
- reverse flow protection
7
Q
If there is an APU fire in flight what will occur automatically?
A
APU automatically shut down
8
Q
When starting the APU on the ground, what are the four indications we look for on ED2 when pressing the power fuel switch?
A
- RPM gauge on the status page
- EGT gauge on the status page
- APU intake door open position on the status page
- APU SOV OPEN on the status message
9
Q
How can fuel be supplied to the APU if the XFLOW/APU pump is inoprative?
A
The pressurized right engine fuel feed manifold via the APU negative-gravity relief valve.
