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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
What happens at Hydraulic Fluid Temperatures 100, 125 & 145°C?
100°C - EICAS Message HI TEMP 125°C - Respective Fluid Shutoff Valve Closes, 3A & 3B Pumps Switch OFF 145°C - EICAS Message OVERHEAT
26
What happens when the Hydraulic Fluid Temperature reaches 145°C?
EICAS Message HYD(1)(2)(3) OVERHEAT
27
What are EDPs and what are they connected to?
Engine Driven Pump - connected to the respective engine Accessories Gearbox
28
What is the purpose of the EDP?
Primary Power Source for the respective Hydraulic System
29
What is the purpose of the AC Electric Hydraulic Pumps?
Backup in the event of failure of the respective EDP/Engine
30
What is the Hydraulic System 1 Electric Pump powered by?
AC BUS 2
31
What is the Hydraulic System 2 Electric Pump powered by?
AC BUS 1
32
When do the Electric Hydraulic pumps activate IN FLIGHT?
EDP Failure OR Engine Failure OR Flaps selected to any position greater than 0° (ie. Take off/landing)
33
When do the Electric Hydraulic pumps activate ON GROUND?
Flaps selected to any position greater than 0° AND Thrust Levers set to Takeoff thrust OR airspeed above 50kts
34
When do the Electric Hydraulic Pumps Deactivate IN FLIGHT?
When the Flaps are stowed after Take Off
35
When do the Electric Hydraulic Pumps Deactivate ON GROUND?
1 minute after the airspeed is below 50kts
36
Why are the Electric Hydraulic Pumps activated for take off and landing?
In case of EDP or Engine Failure
37
In addition to the usual conditions, when is the Hydraulic System 2 Electric Pump activated ON GROUND?
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
Other than the normal conditions, when will the Hydraulic System 2 Electric Pump deactivate?
After 6 minutes having elapsed from parking brake application
39
Why does the Hydraulic System 2 Electric Pump activate in extra conditions?
To provide for single engine taxi - as the nose wheel steering is supplied by Hydraulic System 2
40
What is the system logic for operation of the PTU?
EDP1 NOT Failed (EDP1 Running) AND Flaps NOT clean/Landing Gear NOT up & locked AND Hydraulic Resevoir 2 quantity above 12%
41
What would moving the PTU Selector Knob to ON/OFF do?
Override the Hydraulic System PTU Logic
42
Where is Hydraulic System 3 Located?
AFT Fuselage Bay
43
What pressurises the reservoir?
Mechanical Piston
44
What is the purpose of the Reservoirs?
To supply Hydraulic fluid to the respective Pump
45
Where are Hydraulic Fluid Quantity and Temperature measured?
Reservoir
46
Which Hydraulic System Resevoir has the greatest capacity?
Hydraulic System 2
47
Why is pump 3B not switched on during Take off?
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
What powers Hydraulic Systems 1 & 2?
Their respective Engine Driven Pump (EDP)
49
What is the purpose of the AC Electric Hydraulic Pumps 1 & 2?
Back up power for the respective Hydraulic Systems
50
Where are Hydraulic Systems 1 & 2 located?
Left & Right Centre Fuselage Bay
51
When are the Hydraulic Systems pressurised?
On Engine Start
52
Can Hydraulic Fluid be transferred between the Hydraulic Systems?
No
53
In the event of Hydraulic Fluid Overheat in System 1 or 2 how can you manually close the shutoff valves?
Shutoff Valve Guarded Switch
54
What happens to the EDP in the event of an engine flameout?
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
Why are the Pump Unloader and Flow Limiter Valves fitted to System 3?
Because they are only used in an electrical emergency to avoid overload in the RAT
56
What is the purpose of the Pump Unloader Valve?
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
What is the purpose of the Flow Limiter Valve?
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
How can you manually switch off pumps 3A & 3B in the event of an overheat?
Via the respective Knobs on the overhead panel
59
When will Hydraulic System 3 Overheat Protection be inhibited?
in the event of an electrical emergency
60
Why is Overheat protection inhibited for Hydraulic System 3 in the event of an electrical emergency?
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
What systems do Hydraulic System 1 supply power to?
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
What systems do Hydraulic System 2 supply power to?
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
What systems do Hydraulic System 3 supply power to?
RH Outboard Elevator Lower Rudder L&R Outboard Ailerons
64
What do all 3 System Accumulators do?
Maintain a constant pressure during periods of transient Flow demands Keep Residual pressure in the hydraulic reservoir in order to avoid pump cavitations
65
What extra function does the Hydraulic System 3 Accumulator have?
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
Why is the Hydraulic System 3 Accumulator required to provide power until the RAT has deployed?
Because in the event of a dual engine failure, Pump 3A will initially turn off due to the loss of electrical power
67

Embraer 190 Technical (20 decks)

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