APU Flashcards
1
Q
APU is a
A
Sundstrand APS 2300, Single stage gas turbine engine
2
Q
APU starter duty cycle
A
1st/2nd Attempts 1 min ON / 5 min OFF
3rd Attempt 1 min ON / 5 min OFF
3
Q
Start temperature
A
min -54 C
4
Q
Max start altitude
A
30,000 feet
5
Q
Max operation altitude
A
33,000 feet
6
Q
Max operation electric gen altitude
A
33,000 feet
7
Q
Max operational bleed air
A
15,000 feet
8
Q
Max alt to assist engine start
A
21,000 feet
9
Q
Max rotor speed
A
108%
10
Q
Max EGT
A
Start 1032 C
Continuous 717 C
11
Q
How is APU controlled?
A
Controlled by its own FADEC system
12
Q
How is APU supplied with fuel?
A
Fuel comes for the right wing tank, can also be fed from the left wing wit the Crossed valve
13
Q
APU bleed air provides air for?
A
- Air conditioning
- Pressurization
- Water Pressure
14
Q
When APU is started when is electrics and pneumatics available?
A
- Usually around 95% plus 3 seconds
15
Q
How many starts can you get off the batteries?
A
- Only 2 starts from the 10 minute batteries
