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34 Cards in this Set
- Front
- Back
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How many hydraulic systems are on the aircraft
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3 independent systems
HYD SYST 1 HYD SYST 2 HYD SYST 3 |
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What systems use hydraulic power
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Flight controls
Spoilers Landing Gear Nose Wheel Steering Wheel Brakes Thrust Reversers |
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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 engine driven 4 ACMP's |
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What are the basic components of the hydraulic system
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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 a constant pressure
Helps to avoid pump cavitations |
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When will the ACMP 1 or 2 activate
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Ground:
Flaps >0 and TL set to T/O or GS >50 knots Flight: -Engine failure or engine driven pump failure -Flaps >0 |
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What are some important items controlled by HYD SYST 2
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Landing gear
Nose wheel steering Inboard Brakes |
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What is the PTU
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Power transfer unit
It is a mechanical pump that uses power from HYD SYST 1 and pressure from HYD SYST 2 to allow gear retraction and extension in the event of an engine 2 or engine driven 2 pump failure. |
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When will the PTU automatically activate
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During takeoff or landing with flaps >0 if engine 2 or engine driven 2 pump fails
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How is a single engine taxi possible if the nose wheel steering is on HYD SYST 2
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By releasing the Emergency parking brake ACMP activates
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What is the primary purpose of Hydrulic system 3
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Backup system for the flight controls
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Why are HYD SYST 3A and 3B ON and AUTO
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3A is primary and has no automation
3B is a backup and automatically activates if 3A fails |
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What hydraulic ACMP will activate if the RAT is the only source of electrical power
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Hydraulic ACMP 3A only
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In an electrical emergency what provides hydraulic pressure to the flight controls until the RAT come 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 SYST 3 power requirements overload the RAT
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No, a flow limiter valve and pump unloader valver are used to reduce flow and limit pump electrical power draw to prevent the rat from stalling
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During a windmill start how is the enginge driven hydraulic pump affected
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Pressure is reduced
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How many PSI is the hydraulic system
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3000 PSI
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Where are the engine driven hydraulic pumps located
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Accessory gear box of each engine
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What hydraulic system is the emergency parking brake located on
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1 and 2
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Describe the PBIT tests
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Upon power up the system will accomplish:
3 minute PBIT test to test electrics (Higher level functions, etc) A 1 minute PBIT test will then occur to test the hydraulics |
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What is the normal and backup pumps for each system
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System 1 and 2 primary is the engine driven pump and backup is the AC pumps.
System 3, 3A is the primary and 3B is the backup |
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What does the ON position do on the HYD systems pump knob do
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Overrides the system logic and turns on the respective electric pump
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What hydraulic fluid does the PTU use
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System 2
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When the RAT is deployed how does that affect flap operation
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They operate at half speed
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What systems use HYD system 1
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G ground spoiler panel 2
E Elevator L outboard T thrust reverser eng 1 M multifunction spoilers 3&4 O Outboard brake R rudder upper actuator E emergency parking brake |
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What systems use HYD system 2
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G ground spoilers panel 1
I inboard brakes M multifunction spoilers 5 E elevator L&R inboard T thrust reverser engine 2 A aileron L&R inboard L landing gear N nosewheel steering E emergency parking brake |
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What systems use HYD system 3
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E elevator R outboard
A aileron L&R outboard R rudder lower actuator |
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What would you expect the FADEC to do with HYD SYST 1 & 2 in the event of an engine flameout
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It depressurizes the respective engine driven pump so as to facilitate engine windmill rpm (reduce torque for a restart)
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Explain how the two dediated valves in hydraulic system 3 work during an electrical emergency
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The pump unloader and flow limiter valves are both designed to reduce the amount of electricity used by HYD SYST 3 electric pump A so as to not stall the RAT
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What provides hydraulic pressure from system 3 during an electrical emergency
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Initially, the accumulator provides the pressure until the RAT is deployed and the AC ESS BUS is powered. At that time the system goes back to HYD SYST 3 ELEC pump 3A (B as a backup)
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How many accumulators does each hydraulic system have
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Hydraulic system 1 and 2=2
Hydraulic system 3=1 |
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When will the PTU operate
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During takeoff and landing with the selector knob in AUTO, flaps not set to 0,and if engine 2 or the engine driven hydraulic pump fails
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During a single engine taxi releasing the emerg. parking brake will automatically activate what hydraulic pump
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ACMP 2, allowing nose wheel steering and inboard brakes
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