Hydraulic System

Question 0

How many separate hydraulic systems are there on the CRJ-900?

Answer 0

3

Question 1

Hydraulic systems 1, 2, and 3 normal pressure is?

Answer 1

3000 psi

Question 2

Low pressure “caution” occurs at what pressure?

Answer 2

Less than 1800 psi

Question 3

High pressure occurs at what pressure?

Answer 3

3200 psi

Question 4

What is the normal system quantity?

Answer 4

45% to 85%

Question 5

High temperature condition occurs at what temperature?

Answer 5

Greater than or equal to 96° C

Question 6

The HYD HI TEMP caution indicates that hydraulic fluid is hot in what part of system?

Answer 6

The reservoir

Question 7

How many hydraulics pumps are there?

Answer 7

6; 3 full-time (“A” pumps), 3 part-time (“B” pumps)

Question 8

When will the “B” pumps operate?

Answer 8

Switch On or with switches in AUTO at least one generator online, with the respective bus powered, and flaps extended beyond 0

Question 9

What type of hydraulic fluid is used?

Answer 9

Skydrol

Question 10

What color is the hydraulic fluid?

Answer 10

Purple

Question 11

When will pressure relief occur?

Answer 11

3750 psi or greater

Question 12

When will hydraulic pump 3B operate?

Answer 12

Switch On or with switch in AUTO at least one generator online, with the respected bus is powered, and flaps extended beyond 0 or ADG deployed

Question 13

Pump 3B is automatically running when the ADG is deployed. T/F

Answer 13

True

Question 14

With the switch in the AUTO position, Pump 3B will be operating during normal takeoff and landings. T/F

Answer 14

True

Question 15

What ACMP is directly powered by the ADG?

Answer 15

3B

Question 16

AC motor pumps 1B and 2B will automatically turn on during an engine failure. T/F

Answer 16

False

Question 17

Where would you normally be able to read hydraulic brake pressure?

Answer 17

On the Hydraulic Synoptic Page

Question 18

Where can the Hydraulic systems be viewed on EICAS under normal operating conditions?

Answer 18

EICAS Hydraulic Synoptic Page

Question 19

What activates the Hydraulic SOV at the Engine Firewall?

Answer 19

ENG FIRE PUSH switch light and HYD SOV switch lights on the overhead panel

Question 20

When the hydraulic pump switch 1 and 2 are set to auto, when will the pumps automatically start?

Answer 20

Any main generator online, with the respective bus powered, and flaps are out of ZERO degree position

Question 21

Which hydraulic pumps are engine-driven?

Answer 21

1A and 2A

Question 22

How are hydraulic systems 1 and 2 cooled?

Answer 22

Ram air/oil heat exchanger

Question 23

Systems 1 and 2 are each powered by an EDP and an AC motor pump. T/F

Answer 23

True

Question 24

System 3 is powered by ___ AC motor pumps

Answer 24

2

Question 25

With normal switch positions, which electric hydraulic pump normally operates continuously?

Answer 25

3A

Question 26

How many hydraulic systems are normally used to power the rudder?

Answer 26

3

Question 27

The CRJ has __ hydraulic pumps

Answer 27

6 (2 eng-driven, 4 electric)

Question 28

At cruise, normally which hydraulic pumps are operating?

Answer 28

1A, 2A, and 3A

Question 29

You are taxiing out single engine(right side). Which hydraulic pumps are running in normal operation(flaps up)?

Answer 29

2A and 3A

Question 30

With the No.1 engine shut down in flight, which hydraulic pumps are not available?

Answer 30

1A

Question 31

The A pumps are engine driven, and the B pumps are electric AC motor pumps T/F

Answer 31

False