EMB7 Hydraulics Flashcards
What type and pressure hydraulic fluid?
Skydrol at 3000 psi
Hydraulic system provides power for… (6)
Flight controls Spoilers Landing gear Nose wheels steering Brakes Thrust reversers
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
Hydraulic 1 temp limits
100°c hi temp caution 125°c. SOV CLOSES 145°c. Hyd 1 overheat warning msg
When does hydraulic 1 ACMP turn on in flight?
EDP or engine failure or Flaps selected greater than zero
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
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
In addition to Hydraulic ACMP 1 conditions Hydraulic 2 ACMP turns 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
Hydraulic ACMP 2 auto shuts off on ground when…
6 minutes after parking brake set
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
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%
Hydraulic 3 powers… (3)
Elevator right hand outboard Rudder lower Ailerons left and right outboard
How many pumps in Hydraulic 3?
2 ACMP
When will high temps in Hydraulic 3 not trigger the overheat protection?
In electrical emergency condition
Might be Only source of hydraulic power
Which pump in Hydraulic 3 is primary?
3a
3b is backup
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
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
Where are the Hyd systems located?
1&2 are under and behind the wing
3 is in the rear fuselage behind the pressure bulkhead
How many hydraulic systems?
3
