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Hydraulic systems questions

How many hydraulic systems are on the airplane? • 3 Independent systems• HYD 1, HYD 2, and HYD 3
What systems use hydraulic power? • Flight controls• Spoilers• Landing gear• Nose wheel steering• Wheel brakes• Thrust reversers
Can hydraulic fluid be transferred between each system? NO
How many hydraulic pumps are on the airplane? • 6 total: 2 EDPs (Engine Driven Pumps) 4 ACMPs (AC Motor Pumps)
What are the basic components of the hydraulic systems? • Reservoir • Pumps• Accumulator
What is the purpose of the accumulator? • Helps to maintain constant pressure by covering transient demands• Helps to avoid pump cavitations
When will ACMP 1 or 2 automatically activate?Ground: • Ground Flaps > 0, and• TL set to T/O, or• Groundspeed > 50 kts
When will ACMP 1 or 2 automatically activate?Flight: • Flight Engine failure or EDP failure Flaps > 0
What are some important items controlled by HYD 2 system? • Landing gear• Nosewheel steering• Inboard brakes
What is the PTU? • Power Transfer Unit• Mechanical pump that uses HYD 1 power to provide HYD 2 pressure
What is the primary purpose of the PTU? • To allow landing gear retraction in the event of an engine 2 or EDP 2 failure
When will the PTU automatically activate? • During takeoff and landing with flaps > 0, if Engine 2 fails, or EDP 2 fails
How is single engine taxi possible if nosewheel steering is on HYD 2? • Releasing the parking brake activates ACMP 2
What is the primary purpose of HYD 3 system? • Back-up for the Flight controls
Why are HYD ACMP 3A & B pump switch positions ON & AUTO respectively? • 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
What, if any, HYD ACMP will function if the RAT is the only power source? • HYD ACMP 3A only
In an electrical emergency what provides hydraulic pressure to flight controls until the RAT comes online? • HYD 3 accumulator• After 8 seconds the RAT will power ACMP 3A
In an electrical emergency can HYD 3 system power requirements overload the RAT? • No. A flow limiter valve is used to reduce flow and limits pump electrical power draw to prevent a RAT stall
Created by: rah170