Hydaulic Flashcards
(19 cards)
What type and pressure hydraulic fluid
Skydrol at 3000 psi
How many hydraulic systems
3
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 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
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 Hyd 3
2 ACMP
When will high temps in Hyd 3 not trigger the overheat protection
In electrical emergency condition
Might be Only source of hydraulic power
Which pump in Hyd 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
