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ERJ175 systems > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

How many hydraulic systems does the ERJ175 have?

A

3 independent systems

fluid cannot be transferred from one system to another

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2
Q

Type of hydraulic fluid and pressure?

A

Skydrol Hydraulic fluid; 3000 psi

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3
Q

What do the three hydraulic systems provide pressure for?

6 items

A 
Flight Controls
Spoilers
Thrust Reversers
Landing Gear
Nose Wheel Steering
Wheel Brakes
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4
Q

What items does Hydraulic System 1 provide pressure to?

7 Items

A 
-Elevator
{Left hand outboard actuator)
-Rudder
(Upper Actuator)
-Thrust Reverser
(Engine 1)
-Multifunction spoilers
(left and right panels 3 & 4)
-Ground spoilers
(Left and right panels 2)
-Outboard Brakes
-Emergency parking brake
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5
Q

Hydraulic System 1 is comprised of?

4 items

A

1 Engine driven pump (EDP 1)
1 A/C motor pump (ACMP 1)
1 Reservoir
1 Accumulator

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6
Q

What is the primary power source for hydraulic system 1?

A

Engine driven pump 1 (EDP 1)
It is connected to the engine 1 accessory gearbox
Normal operation requires no pilot action

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7
Q

What serves as a backup for the Engine Driven Pump 1 (EDP 1)? And how is it powered?

A

The ACMP 1, and it is electrically powered by AC BUS 2

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8
Q

What is the normal position for the ACMP 1 knob

  • ON
  • AUTO
  • OFF
A

Auto

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9
Q

On the ground ACMP 1 will turn on as a back up for EDP 1 if?

A

Flap position is greater than 0 AND

  • Thrust levers set to Takeoff Thrust, OR
  • Ground speed greater than 50kts
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10
Q

In flight the ACMP 1 will turn on for 2 reasons?

A
  • EDP 1 or Engine 1 failure

- Flaps selected to any position greater than 0

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11
Q

What items does Hydraulic system 2 provide pressure for?

9 items

A 
-Elevator
(Left and right hand inboard actuator)
-Ailerons
(Left and right hand inboard actuator)
-Thrust Reverser
(Engine 2)
-Multifunction Spoilers
(Left and right panel 5)
-Ground Spoilers
(Left and right panel 1)
-Nose wheel steering
-Inboard Brakes
-Landing Gear
(Retraction and extension)
-Emergency Parking Brake
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12
Q

Hydraulic system 2 is comprised of?

A 
1 Engine driven pump (EDP 2)
1 A/C motor pump (ACMP 2)
1 Reservoir 
1 Accumulator 
1 Power Transfer Unit (PTU)
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13
Q

What is the primary power source for hydraulic system 2?

A

Engine driven pump 2 (EDP 2)
It is connected to the engine 2 accessory gearbox
Normal operation requires no pilot action

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14
Q

What serves as a backup for the Engine Driven Pump 2 (EDP 2)? And how is it powered?

A

The ACMP 2, and it is electrically powered by AC BUS 1

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15
Q

What is the normal position for the ACMP 2 knob

  • ON
  • AUTO
  • OFF
A

Auto

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16
Q

On the ground ACMP 2 will turn on as a back up for EDP 2 if?

A

Flap position is greater than 0 AND

  • Thrust levers set to Takeoff Thrust, OR
  • Ground speed greater than 50k
  • *ALSO**
  • If engine 1 is running and the parking brake is released
  • During Engine 1 start (once N2 reaches 40%) if the parking brake has been applied within the last 6 minutes. (it turns off after 6 minutes have elapsed)
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17
Q

In flight the ACMP 2 will turn on for 2 reasons?

A
  • EDP 2 or Engine 2 failure

- Flaps selected to any position greater than 0

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18
Q

What is the purpose of the PTU?

A

To assist with landing gear retraction or extension should a right engine or right EDP failure occur

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19
Q

What pilot action is required to activate the PTU?

A

None:
During takeoff and landing, with the selector knob in the Auto position the hydraulic system logic activates the PTU if engine 2 or the EDP 2 fails

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20
Q

What condition have to be met for the PTU to turn on?

4 items

A

-Flaps not set to 0 (e.g. Flaps 1 callout)
OR
-Landing gear not up and locked (after takeoff)
AND
-EDP 1 must not be failed
-Hydraulic reservoir 2 quantity above 12%

21
Q

What happens when hydraulic fluid temperature reaches 100 degrees Celsius?

A

The HYD 1/2 HI TEMP (yellow) EICAS caution message is displayed

22
Q

What happens when hydraulic fluid temperature reaches 125 degrees Celsius?

A

Hydraulic system 1 and 2 are equipped with an automatic overheat protection system.
When the temp reaches 125 Celsius, the shutoff valve (SOV) automatically actuates thus isolating the EDP 1 or EDP2 from the respective hydraulic flow line.

23
Q

What happens when hydraulic fluid temperature reaches 145 degrees Celsius?

A

The HYD 1/2 OVERHEAT (red) EICAS warning message is displayed.
In this case the SOV can be manually commanded though a guarded pushbutton on the hydraulic system control panel.

24
Q

If the aircraft is experiencing sever problems and you have lost more than one hydraulic system… what do you do?

A

You must complete the Combined Failure Procedure found in the NON-Annunciated Procedures
(Loss of hydraulic system 1 and 2) ( NAP 1-30, 1-31, 1-31)

25
Q

What happens in the event of an engine flame out?

A

FADEC automatically commands the unload of the respective EDP, Which reduces hydraulic system pressure. This depressurization reduces the torque loads on the engine and facilitates a windmill restart.

26
Q

What systems does Hydraulic system 3 supply pressure to?

3 Items

A 
-Elevator
(Right hand outboard actuator)
-Ailerons
(Left and right outboard actuators)
-Rudder
(Lower actuator)
27
Q

What items provide pressure for Hydraulic system 3?

3 Items

A
  • 2 A/C electric Hydraulic Pumps (ACMP)
  • 1 Reservoir
  • 1 Accumulator
28
Q

What is the primary power source for hydraulic system 3? And how is it powered?

A

Electric Hydraulic Pump 3A (ACMP 3A), it is powered by the A/C ESS BUS

29
Q

What is the normal position for the ACMP 3A knob

  • ON
  • OFF
A

ON after before start checklist below the line.

There is no automation for 3A the pilot has to select ON / OFF

30
Q

What is the purpose for Electric Hydraulic Pump 3B? and how is it powered?

A

3B is the backup for Electric Hydraulic Pump 3A and it is powered by AC BUS 2

31
Q

What is the normal position for the Electric Hydraulic pump 3B knob

  • ON
  • AUTO
  • OFF
A

Auto
The automation turns on Electric pump 3B whenever Electric pump 3A fails in flight.
When the selector knob is set to on, the electric pump operates continuously overriding the system automation.

32
Q

What happens when hydraulic fluid temperature reaches 100 degrees Celsius in hydraulic system 3?

A

The HYD 3 HI TEMP (yellow) EICAS caution message is displayed

33
Q

What happens when hydraulic fluid temperature reaches 125 degrees Celsius in hydraulic system 3?

A

Both Electric Hydraulic Pumps 3A and 3B will turn off.

34
Q

What happens when hydraulic fluid temperature reaches 145 degrees Celsius in hydraulic system 3?

A

The flight crew can manually switch off Pumps 3A and 3B on the Hydraulic System Control Panel.

35
Q

How does an electrical emergency effect Hydraulic System 3?

A

During an electrical emergency condition the Hydraulic System 3 overheating protection system will be inhibited, therefor preventing the Electric Hydraulic Pumps from being turned off automatically in this condition, The associated EICAS messages HYD 3 HI TEMP (yellow) and HYD 3 OVERHEAT (red) will also be inhibited, preventing the flight crew from switching off the only source of hydraulic power available.

36
Q

On the Hydraulic Synopsis Page what do the colors GREEN or WHITE indicate?

A

Normal Operating Range

37
Q

On the Hydraulic Synopsis Page what do the colors AMBER or CYAN indicate

A

Cautionary Range

38
Q

On the Hydraulic Synopsis Page what does the color RED indicate?

A

Operating Range Exceeded

39
Q 
On the Hydraulic Synopsis Page: Hydraulic Pump SOV what color would the following indications be:
OPEN
CLOSED
UNDETERMINED
INTRANSIT
FAILED
A

OPEN - A GREEN circle and a GREEN line aligned with the flow line.
CLOSED - A WHITE circle and a WHITE line perpendicular to the flow line.
UNDETERMINED - An AMBER dashed circle with no lines.
INTRANSIT - A WHITE circle and a WHITE line diagonal to the flow line.
FAILED - A WHITE circle beneath an AMBER cross.

40
Q

On the Hydraulic Synopsis Page: Hydraulic System Distribution Box what would the following colors indicate?
GREEN
WHITE
WHITE / AQMBER DASHED

A

GREEN - The associated flow line is pressurized.
WHITE - The Associated flow line is not pressurized.
WHITE / AMBER DASHED - The associated hydraulic system pressure is undetermined.

41
Q 
On the Hydraulic Synopsis Page: ACMP / EDP/ PTU what color would the following indications be:
ON
OFF
UNDETERMINED
FAILED
A

ON - A GREEN circle and a Green windmill
OFF -A GREY circle and a White windmill
UNDERTERMINED - An AMBER dashed circle and a AMBER windmill
FAILED - A GREY circle and a WHITE windmill beneath an AMBER cross.

42
Q

On the Hydraulic Synopsis Page: Hydraulic Flow Line what would the following colors indicate?
GREEN
WHITE
WHITE / AQMBER DASHED

A

GREEN - The associated flow line is pressurized.
WHITE - The Associated flow line is not pressurized.
WHITE / AMBER DASHED - The associated hydraulic system pressure is undetermined.

43
Q

When does the Hydraulic P-BIT start?

A

Each time all 3 Hydraulic Systems are pressurized and the fluid temperature is above 10 degrees

44
Q

Can the Hydraulic P-BIT test run if the fluid temperature is below 10 degrees?

A

YES - But, only if the test is expired

45
Q

What is the concern of running the Hydraulic P-BIT test when the temperature is below 10 degrees?

A

The system can register the sluggish fluid as an error. This can cause the test to fail and display the FLT CTRL NO DISPATCH EICAS message.
To avoid this it is recommended to complete the Hydraulic P-BIT prior to leaving the airplane over night if the time remaining is less than 25 HRS.

46
Q

How long does the Hydraulic P-BIT test last and what can interrupt it?

A 
1 Min
Moving a flight control 
OR
Turning the pumps back to AUTO and OFF.
If interrupted you only need to repeat the test if it is expired or the time remaining is not enough to complete the next departure.
47
Q

Can the Hydraulic P-BIT expire in flight?

A

YES- The Hydraulic P-BIT is allowed to expire in flight but it must be completed prior to the next departure.

48
Q

How do you restart the Hydraulic P-BIT

A

Refer to SOPM 4-2.12

49
Q

The PTU is an ACMP that turns on automatically whenever it is needed.

A

FALSE

It only Turns on when a right engine or right EDP fails

ERJ175 systems (3 decks)

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