Hydraulic

Question 1

What systems do are the hydraulics responsible for?

Answer 1

Flight controls, landing gear, brakes.

Question 2

How are hydraulic systems 1 and 2 cooled?

Answer 2

A shared air/fluid heat exchanger. No fluid exchanges occurs within the heat exchanger.

Question 3

Why doesn’t hydraulic system 3 require any cooling?

Answer 3

The components for system 3 do not pass near any heat sources that would require extra cooling.

Question 4

Hydraulic SOVs can be closed by selecting the respective ____ switchlight or the ____ switchlights.

Answer 4

ENG FIRE PUSH or HYD 1/2 SOV

Question 5

Hydraulic pump ____ will continue to operate regardless of switch position following ___ deployment.

Answer 5

3B
ADG deployment

Question 6

What is the name of the fluid found in the hydraulic lines?

Answer 6

SKYDROL

Question 7

How many hydraulic pumps are there are the CRJ 900? Describe them:

Answer 7

6 pumps; 3 primary 3 backup.

Systems 1 and 2 A pumps are engine driven, the rest are electric pumps.

Question 8

Arrange the hydraulic systems in terms of size from largest to smallest.

Answer 8

3 largest
2 med
1 smallest

Question 9

What components would you lose if you lost hydraulic system 1? (Use synoptic page)

Answer 9

OB Multi function spoiler(spoileron/flt spoiler), OB Ground spoiler, L reverser.

Question 10

What components would you lose if you lost Hydraulic system 2? (Use synoptic page)

Answer 10

IB Multi function spoiler (spoileron/flt spoiler), LG Alternate Extension, R reverser, OB Brakes.

Question 11

What components would you lose if you lost hydraulic system 3? (Use synoptic page)

Answer 11

IB Ground spoiler, Landing gear extension, Nosewheel steering, IB Brakes

Question 12

What would you be concerned about if you were to lose Hydraulic system 2 and 3?

Answer 12

Landing gear deployment would have to be done by manual release handle. Nose gear will not deploy. Braking would only be done by accumulators up to 6 times with no anti skid.

Question 13

What effects on the braking system would occur with a loss of hydraulic system 3?

Answer 13

50% of braking loss due to IB brake loss.

Question 14

How many brake applications would be possible following failure of hydraulic systems 2 and 3?

Answer 14

Up to 6 applications from accumulators.

Question 15

When will hydraulic pumps 1B and 2B turn on in the AUTO position?

Answer 15

During critical phases of flight when flaps are greater than 0 and cross side bus is powered with any AC GEN operating.

Question 16

When will hydraulic pumps 1B and 2B turn on in the ON position?

Answer 16

When cross side bus is powered with any AC GEN operating.

Question 17

When will hydaulic pump 3B operate in the AUTO position?

Answer 17

Flaps greater than 0 and any AC GEN operating.

Question 18

What are the normal system pressures and quantity?

Answer 18

3000 PSI and 45-85%

Question 19

What temperature will solicit a HYD 1/2 HI TEMP message?

Answer 19

Greater than 96 degrees C

Question 20

When will hydraulic pump 3B operate regardless of switch position?

Answer 20

When ADG is deployed

Question 21

In cruise the right engine flames out and cannot be restarted. What would happen with hydraulics? Would a HYD 2 LO PRESS message appear?

Answer 21

Engine driven pump would fail. HYD 2 LO PRESS would appear. B pump would need to manually be turned on since pumps don’t respond to LO PRESS automatically.

Question 22

TRUE/FALSE, Hydraulic 1B,2B,3B will turn on automatically following a low pressure condition in their respective system?

Answer 22

False

Question 23

You are following HYD 1 LO PRESS checklist when you receive a HYD 2 LO PRESS caution message. What should you do?

Answer 23

Run QRH for double system failure.

Question 24

After an engine failure the QRH directs you to turn the associated HYD B bump to ON. Why?

Answer 24

Engine driven pump has turned off due to engine failure. B pump will need to be activated manually since there is “low pressure”.

Question 25

What PSI does the LO PRESS hydraulic system message turn on at?

Answer 25

Less than 1800 PSI

Question 26

Besides brake applications during Hydraulic failures, what are the accumulators responsible for?

Answer 26

Absorbing surges in the system, activating the parking break.

Question 27

How many total accumulators are there?

Answer 27

5 total, one for each hydraulic system and 2 for brakes.