Hydraulics

Question 1

Left thrust reverser is controlled by which Hydraulic system?

Answer 1

1

Question 2

Right thrust reverser is controlled by which Hydraulic system?

Answer 2

2

Question 3

Outboard brakes are controlled by which Hydraulic system?

Answer 3

2

Question 4

How many PSI are the hydraulic systems?

Answer 4

3000 psi

Question 5

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

Answer 5

pumps will operate when their respective buses are powered, any generator operating and flaps out of zero

Question 6

Which pump is automatically powered by the ADG bus?

Answer 6

3B

Question 7

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

Answer 7

3A

Question 8

Which system operates Inboard brakes?

Answer 8

3

Question 9

Which system operates Nose wheel Steering?

Answer 9

3

Question 10

Which system operates the Landing Gear?

Answer 10

3

Question 11

Where is the service door for the HYD 3 system?

Answer 11

Right side behind the wing

Question 12

What powers the Hyd 3 system?

Answer 12

Electric

Question 13

Which pumps are considered “Full Time Pumps?”

Answer 13

“A” pumps

Question 14

Which pumps are considered “Part Time” pumps?

Answer 14

“B” pumps

Question 15

When will low pressure caution appear on the EICAS?

Answer 15

1800 psi

Question 16

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

Answer 16

96c

Question 17

What is considered high pressure?

Answer 17

3200 psi

Question 18

When will a pressure relief valve engage?

Answer 18

3750 psi

Question 19

How many Hydraulic System Accumulators on the CRJ?

Answer 19

Total of 5

• One for each Hydraulic system (1,2,3)
• One for each brake system (2)

Question 20

What is the function of the Hydraulic Accumulators?

Answer 20

Dampens pressure surges

Question 21

What are the Hydraulic Accumulators charged with?

Answer 21

Dry Nitrogen

Question 22

What is the function of these HYD SOV switches?

Answer 22

Isolates hydraulic fluid to respective EDP(Engine Driven Pump)

Question 23

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

Answer 23

Systems 1 and 2

Question 24

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

Answer 24

Yes

Question 25

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

Answer 25

Yes

Question 26

Which ACMP is directly powered by the ADG?

Answer 26

3B

Question 27

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

Answer 27

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

Question 28

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

Answer 28

Systems 1 and 2

Question 29

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

Answer 29

45 to 85%

Question 30

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

Answer 30

Hydraulic synoptic page

Question 31

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

Answer 31

The EICAS ED2 Hydraulic synoptic page

Question 32

What activates the hydraulic shutoff valve at the engine firewall?

Answer 32

HYD SOV switch, and ENGINE FIRE PUSH switch

Question 33

Which Hydraulic pumps are engine driven?

Answer 33

1A, 2A

Question 34

How are hydraulic systems #1 and #2 cooled?

Answer 34

Ram air / oil heat exchanger

Question 35

System 3 is powered by how many AC motor pumps?

Answer 35

2

Question 36

During normal operations, system 1 provides hydraulic pressure to?

Answer 36

* Rudder and Elevator * Left Aileron * Outboard Multifunction spoiler panels * Outboard ground spoilers * **Left Thrust Reverser**

Question 37

During normal operations, system 2 provides hydraulic pressure to?

Answer 37

* Rudder and Elevator * Right Aileron * Inboard multifunction spoiler panels * Main Landing Gear Auxiliary Actuators * Landing Gear Alternate Extension * **Right Reverser** * **Outboard Brakes**

Question 38

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

Answer 38

3A

Question 39

System 3 provides hydraulic pressure to?

Answer 39

* Rudder and elevators * Left and right aileron * Inboard ground spoilers * Landing gear * **Nosewheel steering ** * **Inboard brakes **

Question 40

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

Answer 40

3

Question 41

The CRJ has how many hydraulic pumps?

Answer 41

6

Question 42

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

Answer 42

All the electric pumps

Question 43

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

Answer 43

3A and 2A

Question 44

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

Answer 44

1A

Question 45

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

Answer 45

False, pump 3A is an AC electric pump

Question 46

What is considered low hydraulic pressure?

Answer 46

\<1800 psi

Question 47

What is considered high hydraulic pressure?

Answer 47

\>3200psi

Question 48

What hydraulic system(s) power the inboard Ground Spoilers?

Answer 48

#3 system

Question 49

What Hydraulic system(s) power the Left Aileron?

Answer 49

#1 and #3