Hydraulics

Question 1

How many separate hydraulic systems are there on the CRJ 900

Answer 1

3

Question 2

Hydraulic systems 1, 2, and 3 normal pressure is

Answer 2

3000 psi

Question 3

Low pressure (Caution) occurs at what pressure

Answer 3

< 1800 psi

Question 4

High pressure occurs at what pressure

Answer 4

3200 psi

Question 5

What is the normal system quantity

Answer 5

45% to 85%

Question 6

High temperature condition occurs at what temp

Answer 6

≥ 96°C

Question 7

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

Answer 7

The reservoir

Question 8

How many hydraulics pumps are there

Answer 8

6, 3 full-time (“A” pumps),

3 part-time (“B” pumps)

Question 9

When will the “B” pumps operate1

Answer 9

Switch ON or with switches in AUTO at least one generator online and flaps > 0

Question 10

When will hydraulic pump 3B operate

Answer 10

Switch ON or with the switch in AUTO, at least one generator online and flaps >0 or ADG deployed

Question 11

What type of hydraulic fluid is used

Answer 11

Skydrol

Question 12

What color is the hydraulic fluid

Answer 12

Purple

Question 13

When will pressure relief occur

Answer 13

≥ 3750 psi