Hydraulic Power

Question 1

Standby Hydraulic Pump power source

Answer 1

normal - right 115 volt variable AC bus

backup - left 115 volt variable AC bus

Question 2

Backup pressure source to hydraulic system 1

Answer 2

AC electrically driven Standby Hydraulic Pump

Question 3

Backup pressure source for hydraulic system #2

Answer 3

Power Transfer Unit powered by hyd system #1

Question 4

3 hydraulic system purpose

Answer 4

provides hydraulic pressure to the left and right inboard elevator PCUs when necessary

Question 5

DC Motor Driven Pump maintains accumulator pressure within…

Answer 5

2600 psi to 3250 psi.

Question 6

When does the #3 hydraulic system automatically operate?

Answer 6

1 and/or #2 main hydraulic system failure, or failure of both engines

Question 7

3 hydraulic system power source

Answer 7

gas charge accumulator pressurized by a DC Motor Driven Pump (DCMP)

Question 8

1 hydraulic system provides power to:

Answer 8

Flaps
Anti-skid Brakes
Inboard Roll Spoilers
Rudder (Lower PCU)
Elevators (Outboard PCUs)
PTU

Question 9

2 hydraulic system provides power to:

Answer 9

Landing Gear
Outboard Roll Spoilers
Nose Wheel Steering
Emergency/Parking Brake
Rudder (Upper PCU)
Elevators (Center PCUs)

Question 10

4 hydraulic system provides power for:

Answer 10

Alternate Landing Gear Extension system

Question 11

Minimum hydraulic quantity for dispatch

Answer 11

40%

Question 12

Hydraulic reservoir capacities

Answer 12

1 8 quarts
2 12 quarts
3 2.6 quarts
4 1.2 quarts

Question 13

Location of #1 hydraulic reservoir

Answer 13

left engine nacelle

Question 14

Location of #2 hydraulic reservoir

Answer 14

right engine nacelle

Question 15

Location of #3 hydraulic reservoir

Answer 15

environmental compartment (high up, aircraft left)

Question 16

Location of #4 hydraulic reservoir

Answer 16

right side nose compartment

Question 17

When will the Standby Hydraulic Pump automatically activate?

Answer 17

no. 1 engine fails

Question 18

The PTU will produce pressure in the no. 2 hydraulic system if:

Answer 18

no. 1 engine driven pump is producing normal pressure and no. 2 hydraulic system has hydraulic fluid

Question 19

When will the PTU operate automatically in the air?

Answer 19

no. 1 engine driven pump is producing normal pressure
no. 2 hydraulic system has hydraulic fluid
flaps are selected to more than 0 OR
no. 2 hydraulic system has lost pressure OR
no. 2 engine oil pressure is low

Question 20

When will the PTU operated automatically on the ground?

Answer 20

no. 1 engine driven pump is producing normal pressure
no. 2 hydraulic system has hydraulic fluid
parking brake released
flaps are selected to more than 0

Question 21

When does the Hydraulic System Isolation valve close?

Answer 21

inadequate fluid quantity

Question 22

When the #1 hydraulic system HYD ISO valve closes, hydraulic power is only available to:

Answer 22

Flaps
Rudder
Elevator
PTU
lose - anti-skid/main wheel brakes, inboard elevator

Question 23

When the #2 hydraulic system HYD ISO valve closes, hydraulic power is only available to:

Answer 23

Rudder
Elevator
lose - landing gear, outboard roll spoilers, nose wheel steering, emergency/parking brake

Question 24

How are the #1 and #2 hydraulic systems cooled?

Answer 24

oil-to-fuel heat exchanger located in the collector bay

Question 25

When does the #1 hydraulic system priority valve close?

Answer 25

1 system hydraulic pressure low

Question 26

Closing of the priority valve shuts off hydraulic power to what?

Answer 26

Flaps and PTU

maintains - anti-skid/main wheel brakes, inboard roll spoilers, rudder, elevator

Question 27

1 or #2 HYD ISO VLV caution light

Answer 27

isolation valve switch has moved hydro-mechanically to the isolate position

Question 28

Normal hydraulic pressure

Answer 28

3000 psi

Question 29

Brake Pressure for Engine Start

Answer 29

1000, Left, 500 right