ORAL* E145 Pneumatics, A/C, and Pressurization

Question 1

Bleed Air sources?

Answer 1

Engines, APU and Ground Cart

Question 2

what is bleed used for?

Answer 2

Pressurization, Engine Start, A/C, and Anti Ice

Question 3

What stages remove bleed air?

Answer 3

9 and 14

Question 4

When does 14th open automatically?

Answer 4

Low thrust, Cross bleed start and anti ice ops

Question 5

What does FADEC’s ECS OFF feature do?

Answer 5

Turns off packs during certain takeoff scenarios

Question 6

When does the cross bleed valve open automatically?

Answer 6

During engine start depending on air source

Question 7

What happens to bleeds if anti ice is on?

Answer 7

Both 14th are open, the left pack shuts off if below 24,600

Question 8

If bleed air duct leak detected what happens automatically?

Answer 8

The Engine bleed valve, Cross bleed valve, High stage valve, and ABV can close

Question 9

Precooler air source?

Answer 9

Engine fan air

Question 10

BLD OVERTEMP limit?

Answer 10

precooler downstream, temp over 305C

Question 11

What cools the packs

Answer 11

Fans on ground, ram air in flight

Question 12

If both Environmental Control Units fail (ECU) how is fresh air supplied

Answer 12

Ram Air…same inlets as used for packs

Question 13

Automatic Temp limits in cabin?

Answer 13

18-29 C

Question 14

How do you activate manual temp control?

Answer 14

Pull temperature knobs