Hydaulic Flashcards Preview

Erj175 > Hydaulic > Flashcards

Flashcards in Hydaulic Deck (19):
0

How many hydraulic systems

3

1

What type and pressure hydraulic fluid

Skydrol at 3000 psi

2

Hydraulic system provides power for


6

Flight controls
Spoilers
Landing gear
Nose wheels steering
Brakes
Thrust reversers

3

Hydraulic system 1 powers


6

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

4

Hydraulic 1 temp limits

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

5

When does hydraulic 1 ACMP turn on in flight

EDP or engine failure or
Flaps selected greater than zero

6

When does hydraulic ACMP 1 turn in on ground

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

7

Hydraulic 2 powers

9

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

8

In addition to Hyd ACMP 1 conditions

Hyd 2 ACMP turns on on ground when

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

9

Hydraulic ACMP 2 auto shuts off on ground when

6 minutes after parking brake set

10

What is the PTU and what Hyd system is it in

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

11

When will PTU activate automatically

Not on ground

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

EDP 1 not failed
Hyd 2 quantity above 12%

12

Hydraulic 3 powers

3

Elevator right hand outboard
Rudder lower
Ailerons left and right outboard

13

How many pumps in Hyd 3

2 ACMP

14

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

In electrical emergency condition

Might be Only source of hydraulic power

15

Which pump in Hyd 3 is primary

3a

3b is backup

16

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

Hyd 3 accumulator

Until ACMP 3a is powered by the AC ESS bus

17

How does Hyd 3 avoid overloading the RAT

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

Where are the Hyd systems located

1&2 are under and behind the wing

3 is in the rear fuselage behind the pressure bulkhead