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Erj175 > Hydaulic > Flashcards

Hydaulic Flashcards

0
Q

What type and pressure hydraulic fluid

A

Skydrol at 3000 psi

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1
Q

How many hydraulic systems

A

3

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2
Q

Hydraulic system provides power for

6

A 
Flight controls
Spoilers
Landing gear
Nose wheels steering
Brakes
Thrust reversers
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3
Q

Hydraulic system 1 powers

6

A 
Elevator - left hand outboard 
Thrust reverser 1
Multifunction panels 3 and 4
Ground spoilers panel 2
Outboard brake
Emergency parking brake
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4
Q

Hydraulic 1 temp limits

A

100°c hi temp caution
125°c. SOV CLOSES
145°c. Hyd 1 overheat warning msg

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5
Q

When does hydraulic 1 ACMP turn on in flight

A

EDP or engine failure or

Flaps selected greater than zero

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6
Q

When does hydraulic ACMP 1 turn in on ground

A

Flaps set greater than 0
Thrust levers set to takeoff thrust
Ground speed greater than 50 kts

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7
Q

Hydraulic 2 powers

9

A 
Elevator left and right inboard
Ailerons left and right inboard
Thrust reverser 2
Multifunction panels 5
Ground spoiler panels 1
Inboard brake
Nose wheel steering
Landing gear ext and retraction
Emergency parking brake
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8
Q

In addition to Hyd ACMP 1 conditions

Hyd 2 ACMP turns on on ground when

A

Engine 1 running and parking brake released

During engine 1 start once n2 reaches 40% and parking brake has been set within last 6 minutes

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9
Q

Hydraulic ACMP 2 auto shuts off on ground when

A

6 minutes after parking brake set

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10
Q

What is the PTU and what Hyd system is it in

A

Power transfer pump. (Assists in gear ext /retraction in event of right EDP or right engine failure)

In system 2 but powered by a pump in system 1

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11
Q

When will PTU activate automatically

A

Not on ground

Flaps not set to zero or landing gear not up and locked

EDP 1 not failed
Hyd 2 quantity above 12%

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12
Q

Hydraulic 3 powers

3

A

Elevator right hand outboard
Rudder lower
Ailerons left and right outboard

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13
Q

How many pumps in Hyd 3

A

2 ACMP

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14
Q

When will high temps in Hyd 3 not trigger the overheat protection

A

In electrical emergency condition

Might be Only source of hydraulic power

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15
Q

Which pump in Hyd 3 is primary

A

3a

3b is backup

16
Q

What powers flight controls in electrical emergency at the beginning if RAT deployment

A

Hyd 3 accumulator

Until ACMP 3a is powered by the AC ESS bus

17
Q

How does Hyd 3 avoid overloading the RAT

A

2 dedicated valves

Unloader valve for start up ( reduces torque and electrical power required) to start the pump

Flow limiter valve - reduces the flow to limit electrical draw on RAT

18
Q

Where are the Hyd systems located

A

1&2 are under and behind the wing

3 is in the rear fuselage behind the pressure bulkhead

Erj175 (39 decks)

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