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Hydraulics Flashcards

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1
Q

What is the rated pressure for the primary hydraulic system?

A

870psi

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2
Q

What is located under the screw on the filler cap of the primary hydraulic reservoir?

A

100 micron screen for filtering large objects

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3
Q

Where is the primary hydraulic system reservoir located?

A

Forward right area of the transmission deck

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3
Q

Where does the primary hydraulic system supply pressure to?

A

Upper bodies of the main rotor flight control servos and the right body of the tail rotor control servo

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4
Q

What is the capacity of the primary hydraulic reservoir?

A

1 gallon

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5
Q

What are the functions of the primary regulation manifold?

A

-Apply external hydraulic power
-Warn of filter stoppage
-Prevent backflow to the pump via check valve
-Regulate and maintain system pressure
-Monitor pressure lower than 145psi
-To visually indicate pressure from 400psi to 1120psi

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5
Q

What is the primary hydraulic gear driven pump driven by?

A

The right accessory drive of the MGB

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5
Q

What provides hydraulic pressure to the primary hydraulic system?

A

Gear driven pump

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5
Q

How does the primary regulation manifold warn of filter stoppage?

A

Via 10 micron pop-button type clogging indicator filter. Located at the bottom forward section.

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6
Q

What psi does the the clogging indicator filter extend? (for generation manifold)

A

7 bars/102psi

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6
Q

How does the primary regulation manifold regulate and maintain pressure?

A

By allowing pressure exceeding 870psi to flow back to return.

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6
Q

How does the primary regulation manifold monitor for pressure lower than 145psi?

A

Via the primary hydraulic pressure transmitter

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7
Q

What is the FLUID capacity of the secondary hydraulic system reservoir?

A

2.1 gallons

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8
Q

What systems does the secondary hydraulic system supply with hydraulic pressure? What pressure?

A

-Rescue hoist (3000psi)
-Landing gear actuators (2000psi)
-Wheel brakes (875psi)
-Lower body of the main servos (870psi)
-Left side of the tail rotor servo (870psi)
-Deck lock probe system (2000psi)

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8
Q

How does the primary hydraulic system monitor pressure lower than 145psi?

A

Opening and closing the primary hydraulic transmitter. The transmitter has an electrical switch and will have an associated EICAS message PRI SERVO
P

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9
Q

What is the function of the primary hydraulic system distribution manifold?

A

provide pressure and return of hydraulic fluid to the upper body of the main flight control servos

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9
Q

What are the functions of the secondary hydraulic system reservoir?

A

-Filter large objects when servicing
-Warn of filter bypass
-Vent to atmosphere
-Energize utility solenoid and deenergize TAIL ROTOR SERVO UNIT CUTTOFF SOLENOID VALVE

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9
Q

How does the primary hydraulic regulation manifold visually indicate pressure, and what range?

A

Via the hydraulic pressure transmitter, and 400psi to 1120psi

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10
Q

What is another function of the primary hydraulic system distribution manifold?

A

Provide pressure relief by bypassing hydraulic pressure in excess of 80 bars (1,160 psi) to return to the reservoir.

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11
Q

Where is the secondary hydraulic reservoir located?

A

Left side under removable air inlet cowling

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11
Q

What is the TOTAL capacity of the secondary hydraulic reservoir?

A

3.2 gallons

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12
Q

How does the secondary hydraulic system filter objects when servicing?

A

100 micron filter

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12
Q

How does the secondary hydraulic system reservoir filter return fluid?

A

3-micron filter

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13
Q

When the level in the reservoir falls below _____, the low-level probe will deenergize the hydraulic control relay.

A

1.05 gallons

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13
What function does the 3-micron filter incorporate to ensure hydraulic fluid returns to the secondary system?
Bypass function
14
How does the secondary hydraulic system reservoir warn of impending filter bypass?
Pop button type clogging indicator
14
What psi is clogging indicator calibrated to open at? (secondary regulation manifold)
29psi/2bars differential pressure
15
What is the red clogging indicator calibrated to extend at on the secondary hydraulic reservoir?
22psi/1.5bars differential pressure
15
How does the secondary hydraulic system reservoir deenergize the tail rotor servo unit cutoff solenoid valve?
The low level probe, mounted from the top of the reservoir
16
What does the hydraulic control relay do?
Energizes isolation valve and deenergize the TAIL ROTOR SERVO UNIT CUTOFF SOLENOID VALVE, triggering an alarm
17
The secondary hydraulic pump maintains a regulated pressure of ____ psi.
3047psi
17
What is the normal flow rate for the secondary hydraulic pump?
7 gallons per minute @ 4500rpm
17
How does the generation manifold warn of impending filter stoppage?
Pop-button type clogging indicator
17
What are the functions of generation manifold?
-Apply external hydraulic power -Prevent backflow to the hydraulic pump when applying external hydraulic power via check valve -Warn of impending filter stoppage -Allow pressure to flow back to the return line in the event of a system high-pressure malfunction. -Sense high pressure and low pressure conditions
17
The red clogging indicator is calibrated to extend at ______ differential pressure. (for generation manifold)
102 psi differential pressure
17
How does the generation manifold allow pressure to flow back to the return line?
Via pressure relief valve
18
What pressure does the relief valve in the generation manifold allow pressure through to the return line?
Psi over 3627
19
How does the generation manifold sense high pressure and low pressure conditions in the secondary system?
Via the dual pressure switch
19
The pressure switch turns on the SEC HYD HI message when system pressure increases to ____________.
3,482 +145 psi
19
What is the function of the pressure transmitter?
Provide an electrical signal of hydraulic pressure to the HYD PRESS SEC/HYD PRESS PRI vertical scale indicator in the CAAS MFD
19
What is the function of the secondary hydraulic pressure switch?
Indicate low pressure in the secondary hydraulic system
19
How does the secondary hydraulic pressure switch function?
By remaining closed with no pressure in the system, opening when pressure increases above 435psi, and closing again IF pressure decreases below 145psi
19
What is the function of the secondary distribution manifold?
Provides pressure and returns hydraulic fluid to the lower bodies of the flight control servos
19
What are the functions of the secondary regulation manifold?
-Reduce pressure from 3047psi to 2031psi -Reduce pressure from 3047psi to 870psi -Prevent backflow from 2031psi supply line via check valves -Isolate the entire 2031psi hydraulic pressure system via utility cutoff solenoid -Isolate the entire 870psi hydraulic pressure system via tail rotor control solenoid isolation valve -Limit flow from a little over 7gpm to a little over 2gpm -Allow pressure over 1305psi to flow back to return to the system reservoir.
19
What systems does the 2031psi hydraulic system service?
Landing gear/brake system, TALON system
19
What are the two main isolation valves in the hydraulic system, and what are they powered by?
3047psi to 2031psi and 3047psi to 870psi, and they are powered by 28VDC
19
Where are the controls for the two main isolation valves?
Overhead control in cockpit and low level probe in the engine compartment
19
Where is the secondary hydraulic regulation manifold?
Near avionics rack, weirdly enough
19
Where is the flow limiter located?
Just before the 3047psi to 870psi pressure reducing valve
19
What is the function of the electric hydraulic pump?
Pressurization of the lower body of the main flight control servo and LH tail rotor servo, as well as charging of the brake accumulator
19
What can the electric pump be used for?
Charging brake accumulator and minimally test flight controls
19
The electric hydraulic pump has a thermal switch that opens when its temperature exceeds ______ degrees F.
392 degrees
20
How heavy of an load can the hoist lift?
600lbs
20
How fast can the hoist reel up?
200ft per minute
21
What is the usable length of the hoist cable?
210ft to 245ft depending on maintenance
22
At what load does the reactive clutch pay out cable, and under what circumstance?
1500lb +-300lbs regardless of circumstance
22
What is the breaking strength of the hoist cable?
3200lbs
23
The ____ controlled, ____ actuated landing gear system consists of what?
Electrically, hydraulically, two main landing gear assemblies, a dual wheel nose gear assembly, and an actuating system
23
Electrical power to the landing gear system is provided by ____.
28VDC
23
The nose and main landing gear cannot be retracted unless _____.
The nosewheels are centered
24
What is one of the main functions of the WOW switch?
Prevent landing gear retraction while weight is on wheels
24
How is hydraulic fluid routed through the landing gear system?
Routes 2031psi through the normal/emergency valve, then through the landing gear solenoid valve to the actuators
25
What is the main function of the uplock/downlock microswitches?
Provide control of the lights on the landing gear indicator and termination control of the extension/retraction solenoids on the selector valve
25
What is the blue light, where is it mounted, and what does it mean?
Externally mounted light mounted forward of the nose gear that alerts ground crew that all wheels are down and locked
26
What is the yellow block, and where is it displayed?
Indicates gear is in motion, and it is mounted above landing gear monitoring panel
27
What does pulling the emergency extension handle do?
Manually moves the normal emergency valve to the emergency position, discharging nitrogen to the down-side of the landing gear actuators
28
How do you know if landing gear is up or down?
For up, green lights extinguished and yellow bar extinguished. For down, green arrows illuminated and yellow bar extinguished.
29
What is the function of the brake control valve?
Regulate any pressure over 798psi-870psi
30
What does the parking brake do to lock the brakes?
Traps pressure in the braking system
30
How much pressure does the parking brake accumulator maintain, and how many braking cycles is it functional for?
2021psi for 20 braking cycles
31
What psi does the TALON system operate with?
2031psi
32
What prevents the talon probe from extending on deck?
WOW switches
32
How many different ways are there to extend landing gear?
1. With the lever 2. Emergency extension lever 3. Flagged safety pin and actuator pin 4. Nitrogen T fitting
32
How many different ways are there to tell the position of landing gear?
1. Green arrows illuminated or not 2. Yellow bar for in transit 3. LDG LOCK advisory 4. Visually from A/C 5. Blue light indicated landing gear down
32
What pressure is supplied to the wheel brake system?
875psi | While 20131psi IS sent to the system, it is further reduced to 875
33
What is the purpose of the toe brake cylinders?
They deliver variable pressure to the brake control valve depending on pilot inputs
33
What are all the inputs to the brake control valve?
1. All four toe brake cylinders 2. Parking brake handle 3. Return to the hydraulic reservoir (not technically and input but whatever) 4. 2031psi supply 5. Wheel brake lines
34
What does the PARKING BRAKE EICAS message indicate?
The position of the handle, not actual brake pressure
35
What kind of message is the LDG lock?
Advisory
36
What else does the emergency extension handle do other than provide emergency extension of landing gear?
Shuts off electrical power to the landing gear solenoid valve and sends hydraulic fluid back to reservoir.
37
Does any of this matter?
Yes. Get qualified, go to college and get another job. Can't stay in one place too long.
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