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KC-130J > Hydraulic System > Flashcards

Hydraulic System Flashcards

1
Q

What are the three hydraulic systems?

A

Utility
Booster
Auxiliary

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2
Q

What does the utility hydraulic system normally supply:

A

wing flaps, main landing gear, nose landing gear, normal brakes, nose wheel steering, aerial refueling reels, and half of the aileron, rudder and elevator control boost system

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3
Q

What does the booster hydraulic system supply:

A

Half of the flight control boost system not powered by the utility hydraulic

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4
Q

What does the auxiliary hydraulic system supply:

A

The auxiliary hydraulic system supplies hydraulic power for cargo door and ramp operation, emergency brake operation, and emergency nose landing gear extension.

The auxiliary hydraulic system also supplies hydraulic power to the utility hyd sys on the ground by connecting the two systems through the ground test valve.

In the case of utility hyd failure in flight, the aux system can be used to operate the inflight refueling system through the utility-auxiliary interconnect valve located in the cargo compartment, on the aft face of the left wheel well bulkhead at fuselage station 617

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5
Q

What are the components of the utility and booster hydraulic systems:

A 
Hydraulic reservoir 
Suction boost pump
Engine-driven hydraulic pump
Shutoff valves
Check valve
Pressure relief valve
Filters
Accumulator
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6
Q

How much fluid does the utility hydraulic system reservoir hold and where is it located

A

5.5 gallons of fluid and is located in the cargo compartment, forward of the left main landing gear wheelwell

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7
Q

The booster hydraulic system reservoir holds how much fluid and where is it located

A

3.1 gallons of fluid and is located in the cargo compartment, forward of the right main landing gear wheelwell

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8
Q

The hydraulic reservoirs are non-___________, ______-fed, hydraulic fluid containers

A

Pressurized

Gravity

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9
Q

Suction boost pumps provide fluid to which systems, provide _ to __ us gallons per minute at pressures __ to __ psi

A

Utility and booster
0 to 20 gallons
70 to 90 psi

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10
Q

The engine driven hydraulic pumps increase pressure to

A

3000 psi

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11
Q

No 1 and 2 engine driven hydraulic pumps supply which system

A

Utility

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12
Q

No 3 and 4 engine driven hydraulic pumps supply which system

A

Booster system

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13
Q

Where are the engine driven hydraulic pumps mounted on the engine ?

A

They are installed on the gearbox mounted accessory drive of each engine

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14
Q

Describe the engine driven hydraulic pumps

A

They are nine-piston, variable-volume type pumps. An internal control mechanism varies output volume with system demand. The flow capacity of each engine depends on engine RPM

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15
Q

What is the purpose of the suction line and pressure line shutoff valves

A

These valves work in unison to isolate the engine driven hydraulic pumps in case of a component failure or an engine shutdown

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16
Q

What is the purpose of check valves.

A

Check valves prevent a reverse flow of hydraulic fluid

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17
Q

How many check valves are there on the utility and booster systems?

A

Utility and booster systems each have six check valves mounted in various locations. The two pump case drain check valves for the two engines used with the utility or booster hydraulic system are mounted to the respective engines. The two isolation check valves are mounted in each dry bay behind the respective engines.

In the booster hydraulic system two check valves are in the reservoir area; the bypass check valve and the priming check valve.

In the utility hydraulic system the bypass check valve is in the reservoir area, however the priming check valve is mounted on the left wing aft beam forward of the life raft liner.

18
Q

What do the pressure relief valves do?

A

Pressure relief valves open to protect the utility and booster hydraulic systems from excessive pressure if an engine driven hydraulic pump fails to regulate pressure

There are two pressure relief valves. One is in the utility and one in the booster system

The relief valve opens at 3,450 psi and reseats at 3,100 psi. They bypass 23 gallons per minute when fully open

19
Q

How many hydraulic filters are there?

A

There are four in each system: one system return filter, one engine pump case drain filter, and two high pressure engine filters

20
Q

What does the system return filter do

A

It removes contaminants from fluids returning to the reservoir

21
Q

What does the engine pump case drain filter do

A

They remove contaminants from the hydraulic fluid returning from the engine driven hydraulic pumps to the reservoirs

22
Q

What do the high pressure engine filters do

A

They remove contaminants from the hydraulic fluid pressurized by the engine driven hydraulic pumps

23
Q

What is the purpose of the accumulators

A

They dampen pressure surges in the pressure lines

24
Q

What is the purpose of the ground test valve

A

The ground test valve allows the auxiliary hydraulic system to be tied to the utility hydraulic system. The auxiliary hydraulic system pressure then operates the utility hydraulic system components.

25
Q

When you pull a fire handle what happens

A

It closes the suction line shutoff valves and pressure line shutoff valves of the utility and booster hydraulic systems in an emergency

26
Q

What happens when you turn off an engine pump switch?

A

In the off position, the switch illuminates OFF and the solenoid-operated shutoff valve in the pressure line closes first, stopping the output fluid flow. The suction line motor-operated shutoff valve closes at a slightly slower speed allowing fluid to fill the lines between the two shutoff valves and isolating the engine driven hydraulic pump from the rest of the system. Hydraulic fluid circulates while the engine driven hydraulic pump continues to run, preventing cavitation.

27
Q

CAUTION: if you activate a soft panel in flight because of a hard panel failure or fault

A

Do not attempt to deactivate the soft panel until the aircraft is back on the ground in a parked configuration

28
Q

What is the normal operating pressure for the utility and booster system

A

2,900 to 3,200 psi

29
Q

What pressure triggers the ACAWS caution UTIL SYS PRESS HI?

A

3,450 psi

30
Q

Which component increases hydraulic system pressure to 3,000 psi?

A

Engine driven hydraulic pumps

31
Q

What are the components of the aux hyd system?

A 
Hydraulic reservoir and hydraulic pump
Hand pump
Filter
Check valve
Ground test valve
32
Q

How much fluid does the aux hyd reservoir hold and describe it

A

It is a non-pressurized, gravity-fed, hydraulic fluid container that holds 5.3 gallons of fluid

33
Q

Describe the aux hyd pump

A

The pump pressurized to 3,000 psi which is electrically-driven, air-cooled, variable volume powered by the 3 phase main ac bus

34
Q

What does the aux hyd hand pump

A

Pressurizes the aux hyd system fluid in the event of hyd pump failure

35
Q

Describe the aux hyd reservoir

A

It is gravity fed and non pressurized

36
Q

What type of filters are used on the aux hyd sys?

A

They are bypass filters, allowing the fluid to bypass the filtration process and either go through the system or return to the hydraulic reservoir

37
Q

What triggers the AUX HYD PMP PRESS LO acaws?

A

The pressure is less than 1,000 psi and the AUX PUMP is on

38
Q

What things are lost when you lose the utility hyd system?

A

Normal landing gear extension and retraction
Nose wheel steering
Normal brake supply
Normal flap extension and retraction
Half of the hyd power supplied to the flight controls
Normal aerial refueling operations; however, the aux system might be used to operate the reels

39
Q

What is lost when you lose the booster hydraulic system?

A

Half of the hydraulic power supplied to the flight controls

40
Q

Aux hyd system failure results in?

A

Cargo door and ramp
Loss of electrically controlled emergency hyd power for
—main landing gear brakes
—extension of the nose landing gear

KC-130J (12 decks)

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