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43 Cards in this Set
- Front
- Back
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What is the normal and alternates pump for hydraulic system 1
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Normal=engine driven
Backup=Electrical |
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What is the normal and alternates pump for hydraulic system 2
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Normal=Engine
Backup=Electrical |
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What is the normal and alternates pump for hydraulic system 3
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Normal=Electrical A
Backup=Electrical B |
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Can we disable the engine driven hydraulic pump
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Yes, by using the guarded engine pump shutoff
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What does the ON position do on the hydraulic systems 1 & 2 ELEC PUMP knob
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Operate the electric pump continusly
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What does the AUTO position do on hydraulic systems 1 & 2 ELEC PUMP knob
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Operate the electric pump automatically
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Hydraulic system 2 powers the nose wheel steering. How then can we do a single engine taxi with just the #1 engine operating
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Releasing the emergency parking brake will cause the #2 system electric pump to come on, which will also supply a full set of brakes
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Hydraulic system 3 has two electric pumps with two control knobs. Electric pump B control knob has an AUTO position with the electric pump and A does not. Why
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Electric pump B acts as a backup in the auto position and will come on automatically if electric pump fails.
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How can you turn on the PTU
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By putting the knob to ON
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With the PTU control know in the AUTO position when will the PTU turn on
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When the engine driven hydraulic pump in system 2 fails and the gear is selected up or down
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What hydraulic fluid does the PTU use
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It uses the hydraulic power from system 1 to pressurize the fluid in system 2
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Where would you find the status of the entire hydraulic system
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MFD Hydraulic system synoptic page
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What systems use Hydraulic system 1
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1.Elevator-Left hand outboard
2.Rudder-Upper actuator 3.Thrust reverser-Eng 1 4.Mulit function spoilers-Left and RT panels 3 and 4 4.Ground spoilers-Left and right panel 2 5.Out board brakes Emergency parking brake |
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What systems use Hydraulic system 2
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1.Elevator-left and right inboard
2.Ailerons-Left and right inboard 3.Thrust reverser-Engine 2 4.Multi function spoilers-left and right panels 5 5.Ground spoilers-left and right panel 1 6.inboard brakes 7.Nose wheel steering 8.Landing gear 9.Emergency parking brake |
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What systems use hydraulic system 3
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1.Elevator-rt hand outboard
2.Rudder-lower actuator 3.Ailerons-left and right outboard |
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What would you expect the FADEC to do with hydraulic system 1 and 2 in the event of an engine flameout
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The FADEC logic would depressurize the respective engine driven hydraulic pump in order to reduce torque loads on the engine to help facilitate a windmill start
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Explain how the two dedicated valves in hydraulic system 3 work during an electrical emergency
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Pump Unloader Valve-Reduces the discharge pressure of hydraulic pump A in system 3 during its start up. This reduces pump torwue and reduces electrical powere required to start the pump
Flow Limiter Valve-Reduces the amount of flow provided by electric pump A in system 3. This limits the electrical power that the pump can draw and prevent the hydraulic pump from stalling the RAT |
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What are the two dedicated valves in hydraulic system 3
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Pump Unloader Valve
Flow Limiter Valve |
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What provides hydraulic power for system 3 during an electrical emergency
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The system 3 accumulator will provide hydraulic power to the associated flight controls from the beginning of RAT deployment until the AC ESS BUS powers the ACMP 3A
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How many hydraulic systems does the 170 have
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3 independent
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How many pounds of pressure does the engine driven hydraulic pumps provide
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3000 PSIG @ 19.0 GPM
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How many hydraulic pumps does the 170 havE
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2 engine driven
4 electric |
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How many pounds of pressure does the electric pumps provide
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2700 PSIG @ 3.7 GPM
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What type pumps are located in hydraulic system 3
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Electic pump A-Normal
Electric pump B-Backup |
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What powers electric pump on hydraulic system 1
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AC BUS 2
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What powers the electric pump on hydraulic system 2
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AC BUS 1
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What powers the electric pump on hydraulic system 3 pump A and pump B
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Pump A=AC ESS BUS
Pump B=AC BUS 2 |
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When will the PTU come on if in AUTO mode
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Failure of the engine driven pump in hydraulic system 2 and the gear raised or lowered
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Where are the accumulators and what do they do
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All three systems and they prevent pump cavitation
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Where are the engine driven pumps of hydraulic system 1 and 2 loacted
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On the respective 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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What hydraulic system is the landing gear located on
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2
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What hydraulic system is the nose wheel steering located on
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2
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How will hydraulic system 3 receive power with an AC electrical failure
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RAT will power hydraulic system 3A pump
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How does the PBIT test work for the hydraulic system
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Upon AC power up an electronic PBIT test will be performed for 3 minutes followed by a 1 minute hydraulic PBIT test for the flight controls
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How long are the electronic and hydraulic flight control PBIT test good for
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20 hours
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During take off what hydraulic pumps are on
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Both engine driven pumps and if the flaps are out of the 0 detent hydraulic system 1 and 2 electric pumps
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When will the electric pumps for hydraulic system 1 and 2 turn off after takeoff
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When flaps have been retracted
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What is the purpose of the flow limiter valve
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To reduce fluid flow so the RAT can spin up faster. When RAT is spun up system will return to normal pressure
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When will hydraulic system 1,2, or 2 shutdown automatically
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Temp above 125 degrees
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What pumps are used during climb,cruise,and descent
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Engine driven 1,2 and Electric 2 A
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How long after landing will the electric pump fro system 1 and 2 remain on for
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1 minute
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During cold winter operstions when is a hydraulic system warm up required
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First flight of the day if temps overnight below 18 C
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