Hydraulics

Question 1

How many pumps does each independent hydraulic system have?

Answer 1

Two: one-driven driven and one electric

Question 2

Where are hydraulic system indications shown?

Answer 2

On the HYD page of the MFD

Question 3

What is the purpose of the two hydraulic accumulators?

Answer 3

To minimize surges of the hydraulic pumps, and to ensure 3,000 psi pressure is available for landing gar and main door (system 1) or operation of the emergency parking brake (system 2)

Question 4

What is the capacity of the hydraulic reservoir?

Answer 4

6 L

Question 5

What are the two ways to close the HYD shutoff valve?

Answer 5

The fire handle or a guarded shutoff button located on the overhead panel

Question 6

Why is the hydraulic reservoir pressurized?

Answer 6

Pressurizing the fluid avoids pump cavitation

Question 7

What is the normal pressure of the engine driven pump?

Answer 7

3,000 PSI

Question 8

What is the normal pressure of the electric motor driven pump?

Answer 8

2,900 PSI

Question 9

What is the procedure for checking the operation of the electric pumps?

Answer 9

-Selects HYD page on MFD
-Switch both pumps to AUTO, verify pressures within 2,900 +/- 200 psi
-Switch both pumps to ON, verify pressures within 2,900 +/- 200 psi
-Switch both pumps off
NOTE: Never turns both pumps ON if the battery is the sole source of electrical power

Question 10

What is the purpose of the priority valve in system No.1?

Answer 10

It gives priority to the flight controls if the system is powered by the electric pump and the landing gear is commanded to retract

Question 11

List the items on the No.1 hydraulic system

Answer 11

-Aileron system 1
-Rudder system 1
-Inboard spoilers
-Outboard brakes
-Landing gear
-Nosewheel steering
-Main door
-Left thrust reverser

Question 12

Where is the engine driven hydraulic pump mounted?

Answer 12

On the accessory gearbox

Question 13

List the items on the No.2 hydraulic system

Answer 13

-Aileron system 2
-Rudder system 2
-Outboard spoilers
-Inboard brakes
-Emergency parking brake
-Right thrust reverser

Question 14

In the event the No.1 system is powered by the electric pump, how is the landing gear retracted?

Answer 14

By the accumulator

Question 15

In normal operations, which hydraulic system raises the main cabin door?

Answer 15

No. 1

Question 16

If the aircraft is unpowered, how many complete operations of the main cabin door does the hydraulic accumulator allow?

Answer 16

Four

Question 17

Hydraulic system pressure remaining in the line after raising the main cabin door is indicated by a “blocked” indication on the attendant’s panel. How can the door be opened?

Answer 17

By using the main door alternative opening valve on the floor to the left of the co-pilot’s seat

Question 18

With the electric pump switch in the AUTO position, when would the electric pump turn on?

Answer 18

When the engine driven pump pressure drops below 1,600 psi or if the associated engine N2 drops below 56.4%

Question 19

At what reservoir fluid level will the amber HYD 1/2 LO QTY caution be shown?

Answer 19

Less than 1 L

Question 20

At what hydraulic system pressure will an amber HYD SYS 1/2 FAIL caution be shown?

Answer 20

Below 1,300 PSI