Hydraulics

Question 1

When do the hydraulic demand pumps operate?

Answer 1

Respective fuel control switch is in CUTOFF, respective engine pump output pressure is low

Question 2

Where can hydraulic fluid quantity be checked

Answer 2

Status page

Question 3

An amber Demand Pump low PRESS light on the hydraulic panel indicates what?

Answer 3

Demand pump operating and output pressure is low or demand pump selector positioned to OFF or AUX

Question 4

What does an amber SYS FAULT light on the hydraulic panel indicate?

Answer 4

Low hydraulic reservoir quantity or low hydraulic system pressure

Question 5

If the HYD PRESS DEM 4 EICAS advisory alert message on the Freighter illuminates shortly after engine 4 has been started what does that indicate?

Answer 5

The system 4 demand pump selector is positioned to AUX

Question 6

In normal operations, why is hydraulic system 4 pressurized first?

Answer 6

To prevent transfer of fluid from hydraulic system 2 or 1 to hydraulic system 4

Question 7

How are hydraulic demand pumps 1 and 4 powered?

Answer 7

Pneumatic

Question 8

Which hydraulic system powers the right autopilot servo?

Answer 8

2

Question 9

A magenta RF next to a hydraulic fluid quantity indicates what?

Answer 9

Can be observed on the Status Page or Hydraulic synoptic and indicates refill is required

Question 10

How are hydraulic demand pumps 2 and 3 powered?

Answer 10

Electric

Question 11

What do the magenta letters RF indicate on the hydraulic synoptic?

Answer 11

Refill of the respective hydraulic system is required

Question 12

A magenta LO next to a hydraulic fluid quantity indicates what?

Answer 12

Can be observed on the Status Page or Hydraulic Synoptic and indicates low reservoir quantity

Question 13

IF an engine fire switch is pulled, the related hydraulic fluid shutoff valve closes. What is the status of the related engine driven hydraulic pump and hydraulic demand pump?

Answer 13

EDP depressurizes and demand pump operates providing pressure to the system.

Question 14

What hydraulic system powers the left autopilot servo?

Answer 14

3

Question 15

Why are the hydraulic system reservoirs pressurized by the bleed air system?

Answer 15

To prevent pump cavitation and ensure positive flow during high demand conditions

Question 16

The hydraulic SYS FAUL lights are flashing on and off, the >HYD QTY LOW X EICAS advisory messages are appearing and disappearing and the EICAS hydraulic quantity indications are decreasing and increasing. This would indicate what condition?

Answer 16

HYQUIM failure

Question 17

When will the AUX 4 hydraulic pump operate with the selector in AUX?

Answer 17

On the ground and engine driven pump 4 not pressurized

Question 18

NWS and body gear steering are powered by which hydraulic system?

Answer 18

1

Question 19

Assuming engine is running and EDP pressure is good, what condition would cause only hydraulic demand pumps 1 and 4 to run in the air with the selector in AUTO?

Answer 19

Flaps out of up

Question 20

Assuming engine is running and EDP pressure is good, what condition would cause only hydraulic demand pumps 1 and 4 to run on the ground with the selector in AUTO?

Answer 20

Flaps in transit

Question 21

With the selector in AUTO, any hydraulic demand pump will operate for either of two conditions. What are the two conditions?

Answer 21

Engine driven pump output pressure low or related fuel control switch is in cutoff

Question 22

What does hyd system 1 normally power?

Answer 22

• Body gear;
• body gear and nose wheel steering;
• inboard trailing edge flaps;
• alternate brakes;
• primary flight controls.

Question 23

Which system powers the center autopilot servo?

Answer 23

1

Question 24

What does the engine driven pump PRESS light indicate?

Answer 24

Low engine hydraulic pump output pressure

Question 25

Pulling and Engine Fire Switch does what?

Answer 25

• Depressurizes the related EDP;
  and
• closes the related hydraulic fluid shutoff valve.

Question 26

What does hyd system 4 normally power?

Answer 26

• Main wing gear,
• outboard trailing edge flaps,
• normal brakes,
• primary flight controls

Question 27

What does hyd system 2 normally power?

Answer 27

• Alternate brakes,
• right stab trim,
• lower YD,
• elevator feel,
• primary flight controls

Question 28

What does hyd system 3 normally power?

Answer 28

• Left stabilizer trim,
• upper YD,
• elevator feel,
• primary flight controls

Question 29

What does hydraulic demand pump low PRESS light indicate?

Answer 29

Demand pump operating and low output pressure or selector in OFF or AUX

Question 30

Which hydraulic system normally powers the autopilot?

Answer 30

2 power right, #3 powers left,

Question 31

An occurrence of any of one of three conditions in the hydraulic system would cause a hydraulic SYS FAULT light indication. What are the three conditions?

Answer 31

Low system pressure, low reservoir quantity, or excessive fluid temperature

Question 32

Wing gear extension and retraction are powered by which hydraulic system?

Answer 32

4

Question 33

Nose and body gear extension and retraction are powered by which hydraulic system?

Answer 33

1

Question 34

When ADPs 1&4 operate automatically?

Answer 34

• TE flaps transit on ground;
  or
• TE flaps out of UP inflight.

Question 35

Hydraulic SYS FAULT light
Illuminates for what conditions?

Answer 35

• Low sys Pressure
• Low reservoir Qty
• High fluid Temp.

Question 36

Demand Pump PRESS light
Illuminates for what conditions?

Answer 36

• Switch OFF or AUX
• Pump operates with output press low.

Question 37

Engine Driven Pump PRESS light illuminates for what conditions?

Answer 37

• Low Pump pressure

Question 38

How hydraulic system is affected by Pulling Engine Fire Switch?

Answer 38

• Shuts off EDP
• Depress EDP
• Demand commanded ON due low EDP pressure.

Question 39

Why during the before start the #4 Demand pump is selected to AUX

Answer 39

• Pressurizes Normal Brakes;
• Decreases Bleed Air demand for engine start.