M15.12 Air Systems

Question 1

What are the 3 sub systems of air systems?

Answer 1

. Compressor control system
. Clearance control system
. Engine cooling system

Question 2

Are all 3 systems independent from each other?

Answer 2

Yes

Question 3

What are the 3 subsystems in a compressor control system?

Answer 3

. Variable valve system
. Variable stator vane system
. HP compressor bleed valve system

Question 4

What are the 3 compressor control systems controlled by?

Answer 4

. Hydro- mechanical fuel control unit or FADEC system

Question 5

What is the main task of the compressor control system?

Answer 5

. Protect the engine against stall and surge

Question 6

What do the variable bleed valves do?

Answer 6

. Control the airflow to the high pressure compressor

Question 7

Where are the variable bleed valves located?

Answer 7

. Installed in the fan frame behind the low pressure compressor

Question 8

What 2 ways does is the HP compressor protected against stall and surge?

Answer 8

. Some engines have bleed valves to bleed of excess air
. Or several stages of variable stator vanes to control the airflow into compressor

Question 9

What do the variable stator vanes do?

Answer 9

Control the incoming airflow into the HP compressor

Question 10

What do bleed valves at the HP compressor improve?

Answer 10

. Engine starting and acceleration capabilities

Question 11

Where are engine bleed valves found?

Answer 11

. Mid or aft stages of HP compressor