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yupi-s-TiSiTi. > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

When do the hydraulic demand pumps operate?

A

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

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2
Q

Where can hydraulic fluid quantity be checked

A

Status page

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3
Q

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

A

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

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4
Q

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

A

Low hydraulic reservoir quantity or low hydraulic system pressure

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5
Q

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?

A

The system 4 demand pump selector is positioned to AUX

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6
Q

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

A

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

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7
Q

How are hydraulic demand pumps 1 and 4 powered?

A

Pneumatic

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8
Q

Which hydraulic system powers the right autopilot servo?

A

2

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9
Q

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

A

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

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10
Q

How are hydraulic demand pumps 2 and 3 powered?

A

Electric

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11
Q

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

A

Refill of the respective hydraulic system is required

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12
Q

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

A

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

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13
Q

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?

A

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

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14
Q

What hydraulic system powers the left autopilot servo?

A

3

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15
Q

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

A

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

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16
Q

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?

A

HYQUIM failure

17
Q

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

A

On the ground and engine driven pump 4 not pressurized

18
Q

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

A

1

19
Q

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?

A

Flaps out of up

20
Q

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?

A

Flaps in transit

21
Q

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

A

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

22
Q

What does hyd system 1 normally power?

A
  • Body gear;
  • body gear and nose wheel steering;
  • inboard trailing edge flaps;
  • alternate brakes;
  • primary flight controls.
23
Q

Which system powers the center autopilot servo?

A

1

24
Q

What does the engine driven pump PRESS light indicate?

A

Low engine hydraulic pump output pressure

25
Q

Pulling and Engine Fire Switch does what?

A
  • Depressurizes the related EDP;
    and
  • closes the related hydraulic fluid shutoff valve.
26
Q

What does hyd system 4 normally power?

A
  • Main wing gear,
  • outboard trailing edge flaps,
  • normal brakes,
  • primary flight controls
27
Q

What does hyd system 2 normally power?

A
  • Alternate brakes,
  • right stab trim,
  • lower YD,
  • elevator feel,
  • primary flight controls
28
Q

What does hyd system 3 normally power?

A
  • Left stabilizer trim,
  • upper YD,
  • elevator feel,
  • primary flight controls
29
Q

What does hydraulic demand pump low PRESS light indicate?

A

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

30
Q

Which hydraulic system normally powers the autopilot?

A

2 power right, #3 powers left,

31
Q

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?

A

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

32
Q

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

A

4

33
Q

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

A

1

34
Q

When ADPs 1&4 operate automatically?

A
  • TE flaps transit on ground;
    or
  • TE flaps out of UP inflight.
35
Q

Hydraulic SYS FAULT light
Illuminates for what conditions?

A
  • Low sys Pressure
  • Low reservoir Qty
  • High fluid Temp.
36
Q

Demand Pump PRESS light
Illuminates for what conditions?

A
  • Switch OFF or AUX
  • Pump operates with output press low.
37
Q

Engine Driven Pump PRESS light illuminates for what conditions?

A
  • Low Pump pressure
38
Q

How hydraulic system is affected by Pulling Engine Fire Switch?

A
  • Shuts off EDP
  • Depress EDP
  • Demand commanded ON due low EDP pressure.
39
Q

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

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

yupi-s-TiSiTi. (24 decks)

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