Hydraulics

Question 1

Will pumps 1B and 2B automatically turn on during an engine failure?

Answer 1

No, they must have the switches placed into the ON position

Question 2

Which Hydraulic systems are cooled with an air/oil heat exchanger?

Answer 2

Systems 1 and 2

Question 3

What is the Normal percentage of Hydraulic fluid in the system?

Answer 3

45 to 85%

Question 4

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

Answer 4

Hydraulic synoptic page

Question 5

Where can the hydraulic system be viewed on EICAS under normal operating conditions?

Answer 5

The EICAS ED2 Hydraulic synoptic page

Question 6

What activates the hydraulic shutoff valve at the engine firewall?

Answer 6

HYD SOV switch, and ENGINE FIRE PUSH switch

Question 7

Which Hydraulic pumps are engine driven?

Answer 7

1A, #2A

Question 8

How are hydraulic systems #1 and #2 cooled?

Answer 8

Ram air / oil heat exchanger

Question 9

System 3 is powered by how many ACMP (motor pumps)?

Answer 9

2 ACMP

Question 10

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

Answer 10

3A

Question 11

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

Answer 11

3 systems

Question 12

The CRJ has how many hydraulic pumps?

Answer 12

6 - two engine-driven, four electric

Question 13

Your at the gate with only the APU running. Which hydraulic pumps can operatate?

Answer 13

All the electric pumps

Question 14

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

Answer 14

3A and 2A

Question 15

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

Answer 15

1A

Question 16

The A pumps are engine-driven, and the B pumps are electric AC motor pumps?

Answer 16

False, pump 3A is an AC electric pump

Question 17

What is considered low hydraulic pressure?

Answer 17

<1800 psi

Question 18

What is considered high hydraulic pressure?

Answer 18

> 3200psi

Question 19

Outboard brakes are controlled by which Hydraulic system?

Answer 19

2

Question 20

Which Hydraulic System(s) get serviced from the AFT Equipment Bay?

Answer 20

Systems 1 and 2

Question 21

Which system operates the Landing Gear?

Answer 21

3

Question 22

Does Pump 3B automatically start when the ADG is deployed?

Answer 22

Yes

Question 23

With the switch in the AUTO position, will pump 3B be operating during normal takeoffs and landings?

Answer 23

Yes

Question 24

Which ACMP is directly powered by the ADG?

Answer 24

3B

Question 25

What is normal Hydraulic System pressure?

Answer 25

3000 PSI

Question 26

Which pump is automatically powered by the ADB bus?

Answer 26

3B

Question 27

Which pump operates continuously with the switch on (NO auto mode)?

Answer 27

3A

Question 28

Which system operates the inboard brakes?

Answer 28

#3

Question 29

Which system operates the nose wheel steering?

Answer 29

#3

Question 30

Where is the service door for the HYD #3 system?

Answer 30

Right side behind the wing?

Question 31

What powers the HYD #3 system

Answer 31

2 electric pumps

Question 32

Which pumps are consider "Full Time Pumps?"

Answer 32

"A" pumps

Question 33

Which pumps are consider "Part Time Pumps?"

Answer 33

"B" pumps

Question 34

When will a low pressure caution appear on the EICAS?

Answer 34

1800 psi

Question 35

When will you get a high temperature caution on the EICAS?

Answer 35

96 * C

Question 36

When will pressure relief valve engage?

Answer 36

> 3750 psi

Question 37

How many Hydraulic System Accumulators on the CRJ?

Answer 37

Total of 5 One for each Hydraulic System (123) One for each brake system (2)

Question 38

What is the function of the Hydraulic Accumulators?

Answer 38

Dampens pressure surges

Question 39

What are the Hydraulic Accumulators charges with?

Answer 39

Dry Nitrogen

Question 40

What is the function of the HYD SOV switches?

Answer 40

Isolates hydraulic fluid from flowing to respective EDP (ENG Driven Pump)

Question 41

When will pumps 1B,2B,and 3B automatically start?

Answer 41

Any generator is operating and flaps out of zero.

Question 42

When will hydraulic pump 3B operate?

Answer 42

Switch ON or switch AUTO and at least one generator online and flaps out of Zero ADG delpoyed

Question 43

What type and color of hydraulic fluid is used?

Answer 43

Skydrol, purple