Hydraulics

Question 0

When does system 3 main pump run?

Answer 0

Continuously

Question 1

What does the hydraulic system supply pressure at?

Answer 1

3000 psi

Question 2

Which flight controls are powered by more than 1 hydraulic system?

Answer 2

Rudder, elevators, and ailerons

Question 3

When do systems 1b and 2b operate?

Answer 3

• respective bus powered
• any generator operating
• flaps out of 0°

Question 4

Do systems 1b and 2b automatically activate after an engine failure or EDP failure?

Answer 4

No

Question 5

What is normal hydraulic system level?

Answer 5

45-85%

Question 6

Low pressure caution

Answer 6

1800 psi

Question 7

High temperature caution

Answer 7

96°C

Question 8

How can you close the hydraulic shutoff valve?

Answer 8

Pressing the HYD SOV push light or ENG FIRE PUSH

Question 9

Does hydraulic system use a heat exchanger?

Answer 9

No, relies on natural convection

Question 10

How are hydraulic systems 1 and 2 cooled?

Answer 10

A single air/hydraulic oil heat exchanger

Question 11

Which system will automatically be powered if the ADG deploys?

Answer 11

System 3b

Question 12

How many accumulators?

Answer 12

• 5 total
• 1 for each system (1, 2, 3)
• 1 for each brake system (inboard/outboard)

Question 13

What are the hydraulic accumulators charged with?

Answer 13

Dry nitrogen

Question 14

What is the purpose of the accumulators?

Answer 14

Dampens pressure surges and satisfies instantaneous demands of aircraft systems