Hydraulic System

Question 1

How many hydraulic systems do we have?

Answer 1

3

Question 2

What pumps are EDP’s and which ones are electrical?

Answer 2

1a & 2a are EDP

1b, 2b, 3a, 3b are all electric pumps (ACMP)

Question 3

Where are the EDP’s located?

Answer 3

On the accessory gear box

Question 4

What is the normal operating pressure of the hydraulic systems?

Answer 4

3,000 psi +/- 200

Question 5

What position should pump 3b be in, in order to be powered when the ADG deploys?

Answer 5

Any position

Question 6

During flight, with hydraulic switches in the AUTO position, what conditions are required for hydraulic pump 1b and 2b to operate?

Answer 6

Respective bus is powered
Any generator online
Flaps out of 0 degrees

Question 7

What is the normal hydraulic reservoir quantity displayed on the Synoptic page?

Answer 7

45%-85%

Question 8

What you loose hydraulic system 3 what brakes do you loose?

Answer 8

Inboard brakes

Question 9

Which of the three hydraulic systems provides control of all primary flight controls?

Answer 9

System 3 only

Question 10

When does the pressure relief valve open? resets?

Answer 10

3,600 psi and resets at 3,200 psi

Question 11

How are hydraulic systems 1 & 2 cooled on the ground? and in the air?

Answer 11

on the ground by an electric fan

in the air by ram air

Question 12

What bus are pumps 3a & 1B wired too?

Answer 12

AC BUS 2

Question 13

What bus are 3b & 2b wired too?

Answer 13

AC BUS 1

Question 14

Are the the HYD SOV shut off valves electric or hydraulic?

Answer 14

Electric; they close when commanded to or when the engine fire push is pressed

Question 15

How much break pressure does the brake accumulator provide?

Answer 15

750 psi; or about 6 applications of brakes

Question 16

System 3 pumps (ACMP) are normally in what position?

Answer 16

AUTO