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23 Cards in this Set
- Front
- Back
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How many hydraulic systems are on the airplane?
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3 Independent systems
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What systems use hydraulic power? (6)
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Flight controls
Spoilers Landing Gear Wheel Brakes Thrust Reversers Nose wheel Steering |
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Can hydraulic fluid be transferred between each system?
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No
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How many hydraulic pumps are on the airplane?
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6 total: 2 EDPs (Engine Driven Pumps) 4 ACMPs (AC Motor Pumps)
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What are the basic components of the hydraulic systems?
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Reservoir Pumps Accumulator
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What is the purpose of the accumulator?
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Helps to maintain constant pressure by covering transient demands Helps to avoid pump cavitations
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When will ACMP1 or 2 automatically activate? Ground
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Flaps > 0º, and TL set to T/O, or Groundspeed > 50 kts
AC pump #2 will activate when you release the parking brake to enable nosewheel steering with single engine taxi on #1 engine |
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When will ACMP1 or 2 automatically activate? Flight
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Engine failure EDP failure Flaps > 0º
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What are some important items controlled by HYD 2 systems?
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Landing gear Nosewheel steering Inboard brakes
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What is the PTU?
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Power Transfer Unit
A mechanical pump that uses HYD 1 power to provide HYD 2 pressure |
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What is the primary purpose of the PTU?
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To allow landing gear retraction or extension in the event of an engine 2 or EDP 2 failure
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When will the PTU automatically activate?
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Engine 2 or EDP 2 Failure & Flaps or gear not up EDP1 working Hydraulic reservoir 2 quantity <12%
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How is single engine taxi possible if nosewheel steering is on HYD 2?
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Releasing the parking brake activates ACMP 2
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What is the primary purpose of HYD 3 system?
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Back-up for the Flight controls
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Why are HYD ACMP 3A & B pump switch positions ON & AUTO respectively?
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HYD ACMP 3A pump is primary and has no automation HYD ACMP 3B pump is a back-up and automatically activates if ACMP 3A fails
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What, if any, HYD ACMP will function if the RAT is the only power source?
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HYD ACMP 3A only
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In an electrical emergency what provides hydraulic pressure to flight controls until the RAT comes online?
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HYD 3 accumulator After 8 seconds the RAT will power ACMP 3A
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In an electrical emergency can HYD 3 system power requirements overload the RAT?
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No A flow limiter valve is used to reduce flow and limits pump electrical power draw to prevent a RAT stall
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What would you expect the FADEC to do with the hydraulic system 1 or 2 in the event of an engine flameout?
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It depressurized the respective engine driven pump so as to facilitate engine windmill rpm (reduces torque for a restart)
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What is used as a back up for the engine driven pump?
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The AC electric hydraulic pump.
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What is the primary power source for hydraulic system 3?
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The electric hydraulic pump 3A.
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What is electric hydraulic pump 3B used for, and when does it operate?
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As a backup for electric hydraulic pump 3A, and is activated whenever the hydraulic pump selector knob is in AUTO and the electric pump 3A fails.
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Which flight controls do hydraulic system 3 control?
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R.H. Outboard Elevator Lower Rudder L.H. & R.H. Outboard Alieron
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