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FT-339C > Hydraulic System > Flashcards

Hydraulic System Flashcards

1
Q

Hydraulic system nominal pressure

A

176 +- 14bar

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2
Q

Hydraulic system provides power for

A

NWS
Landing gear
Brakes
Speedbrake
Flaps
Ail servo control

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3
Q

Initial charge of accumulator

A

59 bar (860psi)

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4
Q

Emergency hydraulic provides power for

A

Emergency gear extension only
Emergency braking

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5
Q

The Separation Valve is set at a pressure of

A

108bar

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6
Q

Main hydraulic system components

A

Reservoir 16,25lt
Accumulator
Engine-driven pump (variable flow)
2 filters
Relief valve
Zero setting selector valve

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7
Q

Emergency hydraulic system components

A

Separation valve
Emergency accumulator
Zero setting selector valve

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8
Q

How many pressure transducers in the hydraulic system

A

2, one for the main and one for the emergency

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9
Q

Signals received from hydraulic pressure transducers are sent to

A

EDAB for showing on the MFD

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10
Q

HYD PRSS comes on when?

A

In case of low hydraulic pressure in the Emergency System (70bar)

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11
Q

What does happen to hydraulic system when the aircraft becomes airborne?

A

The solenoid valve closes isolating the 2 systems

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12
Q

What can you expect from hydraulic indications when performing a steep climb?

A

A pressure drop in the Emergency System because of Nitrogen pressure decreasing because of cooling of the accumulator

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13
Q

What element is used to guarantee pressure from the hydraulic accumulator?

A

Nitrogen (N)

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14
Q

The solenoid separation valve is operated by

A

A solenoid that is energized while on the ground (open) from a switch on the left landing gear struct

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15
Q

After an Emergency Gear Extension, when the A/C is back on the ground, what does happen to the hydraulic system?

A

The isolating valve opens if in the main system there is at least a pressure of 108bar, allowing to all the fluid stored in the accumulator to be directed towards the emergency system for application of emergency braking by using the handle.

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16
Q

In what direction only the separation valve opens?

A

From main to emergency

17
Q

Aileron Servo uses a pressure reduced from ___ to ___

A

From 176bar to 146bar by a pressure reducer

18
Q

Pressure reducer valve (ail servo) is controlled by what switch?

A

AIL SERVO switch in each cockpit

19
Q

AIL SERVO comes on when

A

Pressure < 61bar

20
Q

In case of hydraulic pump failure, the accumulator provides power for which systems

A

Landing gear extension
Wing flaps
Wheel brakes
Ail servo control (temporary use)

NO
NWS
Speedbrake

21
Q

Hydraulic pressure relief valve opens and closes at which values?

A

235 bar opens
201 bar closes

22
Q

Name the 4 hydraulic selectors from left to the right

A

Gear doors
Landing gear
Speedbrake
Flaps

23
Q

How is it possible to understand if one of the 2 filters in hydraulic system is clogged?

A

Red pin pops out

24
Q

Why in the hydraulic system on ground is used a pin?

A

To prevent electrical power to reach the selectors and therefore actuate the system

25
Q

Where the 2 pressure accumulators of hydraulic system are located?

A

Left fuselage

26
Q

Where the hydraulic reservoir is located?

A

Right side of the fuselage

27
Q

Hydraulic reservoir capacity

A

16,25lt

28
Q

What are the names of the 2 filters of hydraulic system

A

Main filter (filter fluid exiting the pump)
Return filter (filter fluid going back to the reservoir)

29
Q

Hydraulic filters can filter up to

A

5microns

30
Q

What happens to hydraulic system in case of a huge leak on ground to the main system?

A

The isolating valve closes at 108bar allowing emergency braking action

31
Q

What could be the first indication of Hydraulic pressure drop in the main system?

A

AIL SERVO on

32
Q

Minimum pressure to operate flaps

A

40bar

33
Q

Min pressure to operate NWS

A

70-80 bar

34
Q

Min press to operate landing gear

A

110bar

35
Q

What’s the hyd fluid color?

A

Red

36
Q

At what temperature does the hyd fluid get fire?

A

75ºC

37
Q

What is the minimum pressure for brakes application?

A

70bar

But w/ 50 bar a minimum of 10 brakes application should be granted

FT-339C (12 decks)

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