week 6

Question 1

Use to prevent compressor stalls that occur when the compressor is not running at it’s design speed.

Answer 1

Anti-stall Devices

Question 2

Where is the variable bleed valve located?

Answer 2

case of the compressor

Question 3

Purpose of a variable bleed valve?

Answer 3

To prevent compressor stalls below 91%

Question 4

What is bleed valve consist of?

Answer 4

Consists of a pressure operated piston sliding on a guide pin.

Question 5

P3 pressure is always _____ than P2.5

Answer 5

higher

Question 6

What is Modified P3 air pressure?

Answer 6

air pressure below the diaphragm

Question 7

what will rise if bleed valve is open longer?

Answer 7

EGT

Question 8

Is the bleed valve diaphragm replaceable?

Answer 8

Yes

Question 9

Is the bleed valve orifice replaceable?

Answer 9

No, they are matched to the bleed valve

Question 10

What happens when the main orifice is blocked/restricted?

Answer 10

Valve will stay open longer

Question 11

What happens If diaphragm is ruptured?

Answer 11

Valve will stay open longer

Question 12

If convergent divergent orifice is blocked or restricted bleed valve will stay?

Answer 12

closed or close early.

Question 13

Similar to the bleed valve except that with this system, air is bled from the rear stages of the compressor through the use of a band around the compressor, rather than a single valve.

Answer 13

Variable Bleed Bands

Question 14

What kind of aircraft engine uses “Pressure Ratio Bleed Control Systems.”?

Answer 14

Larger Turbo Fan Engines

Question 15

How many bleed valves are there on the JT8D engine?

Answer 15

3

Question 16

Where are the valves located?

Answer 16

2 are on the 13th stage and 1 on the 8th stage of the high pressure compressor

Question 17

These type of bleed valves are frequently used on large turbo fan engines and operated by the FADEC and EEC.

Answer 17

Transient bleed valves

Question 18

To reduce rotational friction, the inlet guide vanes and stator vanes rotate within?

Answer 18

Teflon sockets

Question 19

Where do you control the Variable Inlet Guide Vanes and Variable Stator Vanes?

Answer 19

main engine Fuel Control Unit

Question 20

Information regarding the position of the VIGV / VSV is provided back to the FCU through the use of a?

Answer 20

Feedback cable