Hydraulics

Question 1

Hydraulic system pressure

Answer 1

• Normal system operating pressure is 3 000 PSI

- 2500 PSI when powered by the RAT

Question 2

How many hydraulic pumps?

Answer 2

• 1 engine pump for the green system
• 1 engine pump for the yellow system
• 1 electric pump for the yellow system
• 1 hand pump for the yellow system to operate the cargo doors
• 1 electric pump for the blue system
• 1 RAT pump for the blue system

Question 3

When does the PTU turn on?

Answer 3

automatically when the differential pressure between the green and the yellow systems is greater than 500 PSI

Question 4

RAT Deployment

Answer 4

• deploys automatically if:
  * Above 100 kts
  * AC BUS 1 and AC BUS 2 are both lost
• manually via overhead panel pb

Question 5

Hydraulic reservoir capacity

Answer 5

Green: 14.5L
Yellow: 12.5L
Blue: 6.5L