APU Limitations Flashcards
1
Q
Min. APU Temperature
A
-54°C
2
Q
Max APU Temperature
A
ISA +35
3
Q
Max APU Start Altitude
A
30,000 ft
4
Q
Max APU Altitude
A
33,000 ft
5
Q
Max Bleed Use
A
15,000 ft
6
Q
Max Engine Start
A
21,000 ft
7
Q
APU Starter Duty Cycle (Attempts 1 & 2)
A
60 Seconds OFF
8
Q
AUP Starter Duty Cycle (3rd Attempt)
A
5 Minutes OFF
9
Q
APU Protection (On Ground)
A
UFO SHELF
Underspeed
FADEC Critical Fault
Overspeed
Sensor Fail
High Oil Temp.
EGT Overtemp.
Low Oil Pressure
Fire
10
Q
APU Protection (In Air)
A
UFO
Underspeed
FADEC Critical Fault
Overspeed
11
Q
How long is the APU cooldown period?
A
60 seconds
12
Q
How long is the APU spooldown period?
A
60 seconds
13
Q
How long after EICAS initialization do you have to wait before starting the APU?
A
30 seconds
