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Embraer 190 Technical > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

How many Hydraulic Systems are there?

A

3

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2
Q

What type of Hydraulic Fluid is used?

A

Skydrol

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3
Q

At what Nominal Pressure does the Hydraulic System operate?

A

3000psi

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4
Q

What does the Hydraulic System provide power for?

A

Primary & Secondary Flight Controls
Landing Gear
Nose Wheel Steering
Wheel Brakes
Thrust Reversers

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5
Q

What are the components of Hydraulic System 1?

A

1 x EDP
1 x AC Electric Hydraulic Pump
1 x Accumulator
1 x Resevoir

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6
Q

What are the components of Hydraulic System 2?

A

1 x EDP
1 x AC Electric Hydraulic Pump
1 x Accumulator
1 x Resevoir
1 x PTU

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7
Q

What are the components of Hydraulic System 3?

A

2 x AC Electric Hydraulic Pumps
1 x Accumulator
1 x Resevoir

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8
Q

What do the accumulators do?

A

Maintain a constant pressure during periods of transient flow demand

Keep a residual pressure in the hydraulic reservoir in order to avoid pump cavitations

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9
Q

Where is the PTU Installed?

A

Between Hydraulic System 1 and 2

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10
Q

What is the purpose of the PTU?

A

To transfer hydraulic power from Hydraulic System 1 to Hydraulic System 2 in order to assist with landing gear retraction and extension in the event that:
EDP2 fails
OR
Engine 2 (Right) Fails

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11
Q

What is the PTU comprised of?

A

Hydraulic Pump in System 2 and a Hydraulic Motor installed in System 1

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12
Q

What is the Primary Power Source for Hydraulic System 3?

A

Pump 3A

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13
Q

What powers Hydraulic Pump 3A?

A

AC ESS BUS

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14
Q

What is the purpose of Pump 3B?

A

Backup for Pump 3A

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15
Q

What powers Hydraulic Pump 3B?

A

AC BUS 2

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16
Q

Which Hydraulic Pump Knobs should be set to AUTO?

A

System 1, 2 and 3B

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17
Q

When is Hydraulic Pump 3A switched ON?

A

During Engine Start

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18
Q

Why does Pump 3A not have an AUTO Switch?

A

Because there is no automatic logic associated with 3A

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19
Q

Which Pump does not activate during Take off and Landing?

A

Pump 3B

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20
Q

What is the purpose of the Pump Unloader Valve/Flow Limiter Valve?

A

Used in an Electrical Emergency to Avoid Overload in the RAT

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21
Q

What happens when the Hydraulic Fluid Temperature reaches 100°C?

A

HYD 1(2)(3) HI TEMP EICAS Message

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22
Q

When would you see the EICAS Message HYD 1(2)(3) HI TEMP?

A

When the Hydraulic Fluid Temperature reaches 100°C

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23
Q

When will the Fluid Shut off Valves automatically close?

A

When the Hydraulic Fluid Temperature reaches 125°C

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24
Q

What happens when the Hydraulic Fluid Temperature reaches 125°C?

A

The Fluid Shutoff Valve automatically closes, isolating the respective EDP from the respective Hydraulic flow line

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25
Q

What happens at Hydraulic Fluid Temperatures 100, 125 & 145°C?

A

100°C - EICAS Message HI TEMP
125°C - Respective Fluid Shutoff Valve Closes, 3A & 3B Pumps Switch OFF
145°C - EICAS Message OVERHEAT

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26
Q

What happens when the Hydraulic Fluid Temperature reaches 145°C?

A

EICAS Message HYD(1)(2)(3) OVERHEAT

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27
Q

What are EDPs and what are they connected to?

A

Engine Driven Pump - connected to the respective engine Accessories Gearbox

28
Q

What is the purpose of the EDP?

A

Primary Power Source for the respective Hydraulic System

29
Q

What is the purpose of the AC Electric Hydraulic Pumps?

A

Backup in the event of failure of the respective EDP/Engine

30
Q

What is the Hydraulic System 1 Electric Pump powered by?

A

AC BUS 2

31
Q

What is the Hydraulic System 2 Electric Pump powered by?

A

AC BUS 1

32
Q

When do the Electric Hydraulic pumps activate IN FLIGHT?

A

EDP Failure
OR
Engine Failure
OR
Flaps selected to any position greater than 0°
(ie. Take off/landing)

33
Q

When do the Electric Hydraulic pumps activate ON GROUND?

A

Flaps selected to any position greater than 0°
AND
Thrust Levers set to Takeoff thrust
OR airspeed above 50kts

34
Q

When do the Electric Hydraulic Pumps Deactivate IN FLIGHT?

A

When the Flaps are stowed after Take Off

35
Q

When do the Electric Hydraulic Pumps Deactivate ON GROUND?

A

1 minute after the airspeed is below 50kts

36
Q

Why are the Electric Hydraulic Pumps activated for take off and landing?

A

In case of EDP or Engine Failure

37
Q

In addition to the usual conditions, when is the Hydraulic System 2 Electric Pump activated ON GROUND?

A

Engine 1 running and parking Brake released
OR During Engine 1 Start (once N2 reaches 40%) if the parking brake has been applied within the last 6 minutes

38
Q

Other than the normal conditions, when will the Hydraulic System 2 Electric Pump deactivate?

A

After 6 minutes having elapsed from parking brake application

39
Q

Why does the Hydraulic System 2 Electric Pump activate in extra conditions?

A

To provide for single engine taxi - as the nose wheel steering is supplied by Hydraulic System 2

40
Q

What is the system logic for operation of the PTU?

A

EDP1 NOT Failed (EDP1 Running)
AND
Flaps NOT clean/Landing Gear NOT up & locked
AND
Hydraulic Resevoir 2 quantity above 12%

41
Q

What would moving the PTU Selector Knob to ON/OFF do?

A

Override the Hydraulic System PTU Logic

42
Q

Where is Hydraulic System 3 Located?

A

AFT Fuselage Bay

43
Q

What pressurises the reservoir?

A

Mechanical Piston

44
Q

What is the purpose of the Reservoirs?

A

To supply Hydraulic fluid to the respective Pump

45
Q

Where are Hydraulic Fluid Quantity and Temperature measured?

A

Reservoir

46
Q

Which Hydraulic System Resevoir has the greatest capacity?

A

Hydraulic System 2

47
Q

Why is pump 3B not switched on during Take off?

A

There are no high flow demands on system 3
AND
Pump 3A is powered by the AC ESS BUS and so would not be affected by the loss of an engine

48
Q

What powers Hydraulic Systems 1 & 2?

A

Their respective Engine Driven Pump (EDP)

49
Q

What is the purpose of the AC Electric Hydraulic Pumps 1 & 2?

A

Back up power for the respective Hydraulic Systems

50
Q

Where are Hydraulic Systems 1 & 2 located?

A

Left & Right Centre Fuselage Bay

51
Q

When are the Hydraulic Systems pressurised?

A

On Engine Start

52
Q

Can Hydraulic Fluid be transferred between the Hydraulic Systems?

A

No

53
Q

In the event of Hydraulic Fluid Overheat in System 1 or 2 how can you manually close the shutoff valves?

A

Shutoff Valve Guarded Switch

54
Q

What happens to the EDP in the event of an engine flameout?

A

The FADEC automatically commands the unload of the respective EDP to reduce hydraulic pressure. This reduces the torque loads on the engine and facilitates a windmill restart

55
Q

Why are the Pump Unloader and Flow Limiter Valves fitted to System 3?

A

Because they are only used in an electrical emergency to avoid overload in the RAT

56
Q

What is the purpose of the Pump Unloader Valve?

A

Reduces discharge pressure of Pump 3A during its start up, reducing the pump torque and therefore the electrical power required to start the pump

57
Q

What is the purpose of the Flow Limiter Valve?

A

Reduces the amount of flow provided by Pump 3A. This limits the electrical power than the pump can draw and prevents the pump from stalling the RAT

58
Q

How can you manually switch off pumps 3A & 3B in the event of an overheat?

A

Via the respective Knobs on the overhead panel

59
Q

When will Hydraulic System 3 Overheat Protection be inhibited?

A

in the event of an electrical emergency

60
Q

Why is Overheat protection inhibited for Hydraulic System 3 in the event of an electrical emergency?

A

This means the pumps will not be turned off automatically and no EICAS messages will be displayed. This prevents the flight crew from switching off the only source of Hydraulic Power available

61
Q

What systems do Hydraulic System 1 supply power to?

A

LH Outboard Elevator
Upper Rudder
ENG 1 Thrust Reversers
MFS L&R 3&4
Ground Spoilers L&R 2
Outboard Brakes
Emergency Parking Brake

62
Q

What systems do Hydraulic System 2 supply power to?

A

L&R Inboard Elevator
L&R Inboard Ailerons
ENG 2 Thrust Reversers
MFS L&R 5
Ground Spoilers L&R 1
Outboard Brakes
Nose Wheel Steering
Landing Gear
Emergency Parking Brake

63
Q

What systems do Hydraulic System 3 supply power to?

A

RH Outboard Elevator
Lower Rudder
L&R Outboard Ailerons

64
Q

What do all 3 System Accumulators do?

A

Maintain a constant pressure during periods of transient Flow demands
Keep Residual pressure in the hydraulic reservoir in order to avoid pump cavitations

65
Q

What extra function does the Hydraulic System 3 Accumulator have?

A

In an Electrical Emergency, the accumulator provides hydraulic power to the associated flight controls while the RAT deploys until Pump 3A is powered by the AC ESS BUS (restarts)

66
Q

Why is the Hydraulic System 3 Accumulator required to provide power until the RAT has deployed?

A

Because in the event of a dual engine failure, Pump 3A will initially turn off due to the loss of electrical power

67
Q
A

Embraer 190 Technical (20 decks)

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