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Chegg Decks > Test_2_Hydraulics_deck > Flashcards

Test_2_Hydraulics_deck Flashcards

1
Q

What is the purpose of the utility hydraulic system?

A

To provide hydraulic pressure to operate subsystems for ground operations and some emergencies throughout the helicopter

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2
Q

What are the sub-systems that are operated by the utility hydraulic system?

A
  1. Power Transfer Units2. APU Start system3. Engine Start System4. Cargo Ramp5. Power Steering6. Swivel Locks7. Wheel Brakes8. Center Cargo Hook9. Cargo Winch/Rescue Hoist
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3
Q

Hydraulic Service Module

A

Right side of cabin in ramp areaUsed for adding hydraulic fluid to the utility, No.1 and No.2 flight control hydraulic systems

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4
Q

Utility Reservoir/Cooler assembly

A

Right side in the aft pylonStores and cools fluid for system operation

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5
Q

Utility Reservoir Pressurization Accumulator

A

Aft pylon hydraulics compartment adjacent to the reservoir/coolerMaintains pressure on the reservoir/cooler when system is not operating

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6
Q

Utility System Hand pump

A

Right side of the ramp compartmentUsed to pressurize the APU start accumulator

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7
Q

Electric Pump for the Utility System Hydraulic Accumulator (EPUSHA)

A

Right side of the ramp area aft of the hand pumpUsed to pressurize the APU start accumulator

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8
Q

APU Start Accumulator (Pre-fit pressure 2500-3500 or 3000 psi)

A

Above the maintenance panel in the aft XMSN areaStores fluid under pressure primarily for APU starting1 of 4 sources of pressure

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9
Q

APU Motor/Pump

A

Forward end of the APUProvides system pressure (3350 psi) for engine start, ground checks and can only be used in flight during emergencies1 of 4 sources of pressure

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10
Q

APU Start Module (Pre-fit pressure 2500-3500 or 3000 psi)

A

Right side of the aft ramp compartmentControls the APU motor/pump mode of operation (motor/pump) and APU start accumulator pressure during the APU start sequence

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11
Q

Utility Hydraulic Aft Transmission Driven Pump

A

Right side of the aft transmissionProvides system pressure (3000 psi) when rotors are turning 1 of 4 sources of pressure

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12
Q

Flight Hydraulic Power Transfer Unit (PTU)

A

No.1 located in the FWD pylon areaNo.2 located in the AFT pylon area Provides pressure (3000 psi) to operate flight controls during ground operations and emergenciesMotor side of the PTU is powered by the utility system

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13
Q

Auxiliary Ground Power Unit (AGPU)

A

Connected at the service panel on the right side of the helicopter.Provides 3000 psi of hydraulic pressure1 of 4 sources of pressure

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14
Q

Utility Hydraulic Pressure Control Module

A

Ramp/cabin area on the #1 side of the #8 synchronizing driveshaftProvides a routing point for all pressurized fluid for the entire system.Controls, filters, and monitors fluid pressure for the utility hydraulic system

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15
Q

Utility Hydraulic Return Control Module

A

Ramp/cabin area on the #2 side of the #8 synchronizing driveshaftProvides a collection point of all return fluids for the entire system. Filters return fluid for the utility hydraulic system.Houses the pump fail/fault sensors for the utility hydraulic pump and the APU motor/pump.

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16
Q

Brake Accumulator

A

Forward pylon area on the left hand sideStores pressurized fluid for the brake system. Used to make brake applications during emergency situations/towing procedures.

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17
Q

Power Steering Module

A

Right side of the ramp compartmentRoutes hydraulic fluid to the following components:Power steering actuatorSwivel lock actuatorsWheel centering cams

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18
Q

Utility Hydraulic Control Panels

A

Overhead consoleAllows the crew to operate the subsystems and to isolate leaking subsystems from the rest of the system

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19
Q

Maintenance panel

A

Right side of the ramp compartmentMonitored by the Flight Engineer (FE) during starting, in-flight and shutdown for system pressures, fluid temperatures, fluid levels, filter change lights and pump fail/fault lights.

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20
Q

What are the four sources of pressure for the utility hydraulic system?

A

APU start accumulator (stores 3000 psi of pressure)APU motor/pump (provides 3350 psi for ground operations and some inflight emergencies)Utility Hydraulic pump (provides 3000 psi for normal system operation when rotors are turning and the APU is shut down)Auxiliary Ground Power Unit (AGPU) (provides 3000 psi during some maintenance functions)

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21
Q

When can the fill module be used to add fluid to the hydraulic systems?

A

While the aircraft is shut down, running, or in-flight

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22
Q

What could happen if the fluid level is allowed to go below the sight glass while using the fill module?

A

Air could be pumped into the hydraulic system that is being filled.

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23
Q

What is the purpose of the visual fluid indicator on the hydraulic reservoir?

A

A mechanical means of determining the actual fluid level in the reservoir.Green band provides an accurate fluid level indication.

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24
Q

What should the gauge indication be on the utility reservoir pressurization accumulator during preflight?

A

2500 to 3500 psi

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25
Q

When should a pilot use the utility reservoir depressurization valve?

A

PILOTS DO NOT USE. This valve is for maintenance purposes.

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26
Q

Why should EPUSHA operations not exceed five?

A

To ensure battery power is available to start the APU, multiple uses may deplete the aircraft battery.

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27
Q

What should the pressure indicate during preflight on the APU start accumulator?

A

3000 psi

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28
Q

What is the Emergency Utility Pressure Valve used for and what position should the valve be in during preflight?

A

Allows the APU start accumulator or the hand pump (in some emergencies) to pressurize the utility system.Valve should be in Normal/Close position during preflight

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29
Q

What should the pressure indicate during preflight on the APU start module accumulator?

A

3000 psi

30
Q

When would the APU motor pump be used during flight?

A

Emergencies: should the transmission driven utility pump fail during flight.

31
Q

What component provides the utility hydraulic systems pressure in flight, under normal conditions?

A

Utility Hydraulic Pump (Aft transmission)

32
Q

What provides the utility hydraulic pressure indications to the crew?

A

Pressure Control Module: provided by a pressure transmitter and a pressure switch.Pressure transmitter sends pressure reading to the gauge on the maintenance panel.Pressure switch activates utility hydraulic caution on the electrical panel and MFD Caution Summary when pressure drops below 1800 psi and deactivates the caution when pressure is approaching 2300 psi.

33
Q

What should be checked on the pressure control module during preflight?

A

The visual contamination indicator button.

34
Q

What should be checked on the return control module during preflight?

A

The visual contamination indicator button.

35
Q

What indications are provided on the maintenance panel for the utility hydraulic system?

A

Utility Hydraulic pressure indicatorUtility Hydraulic fluid temperature indicatorUtility Hydraulic Reservoir level indicatorUtility Hydraulic filter change indication lightsPump fault indication lights

36
Q

Identify the 5 accumulators in the Utility Hydraulic system and what the pressure should be for each during preflight.

A

APU Start Accumulator - 3000 psiAPU Start Module - 3000 psiBrake Accumulator - 600-1400 psiPower Steering Accumulator - Utility Reservoir Pressurization Accumulator (URPA)- 2500-3500 psi

37
Q

Which of the 5 accumulators are for emergencies?

A

Brake AccumulatorPower Steering AccumulatorRamp Accumulator

38
Q

What is the purpose of the flight control hydraulic systems?

A

Convert pilot mechanical inputs into hydraulic inputs.

39
Q

How many flight control hydraulic systems does the CH47 have?

A

two

40
Q

Each system can individually provide the fluid pressure to operate one of the pistons on each of the ___ and half of each of the ___.

A

four dual upper boost actuatorsfour integrated lower control actuators (ILCAs)

41
Q

When can the hydraulic fill module be used to add fluid to the hydraulic systems?

A

On the ground or in flight

42
Q

What is the purpose and location of the no.1 and no.2 flight hydraulic reservoir/coolers and fans?

A

Stores and cools fluid for system operationNo.1 located in the FWD pylon areaNo.2 located in the AFT pylon area

43
Q

What is the temperature range of the hydraulic fluid when the hydraulic cooling fans will operate?

A

When hydraulic fluid temp. is between 54 and 63 degrees C.

44
Q

What is the purpose and location of the no.1 and no.2 flight hydraulic power transfer units?

A

Provides the hydraulic pressure to the No.1 and No.2 system during ground operations and rotors are not turning.No.1 located in the FWD pylon areaNo.2 located in the AFT pylon area.

45
Q

What is the purpose and location of the No.1 and No.2 flight hydraulic pumps?

A

Provides the hydraulic pressure to the No.1 and No.2 system once the rotors are turning.No.1 located on the bottom of the FWD transmissionNo.2 located on the left side of the AFT transmission

46
Q

What is the purpose and location of the No.1 and No.2 flight hydraulic power control modules?

A

Filters, monitors, and controls the pressure fluid for the No.1 and No.2 system.No.1 located in the FWD pylon areaNo.2 located in the AFT pylon area

47
Q

The Lower Control Pressure Control Modules reduce pressure from ___ to ___, for the ___ portion of the ILCA and the ___ link portion of the ILCA.

A

3000 psi to 1500 psiBoostExtensible

48
Q

Which portion of the ILCAs is the No.1 side and which is the No.2 side?

A

Upper portion is the No.1 portionLower portion is the No.2 portion

49
Q

What must be done if a JAM indicator is found extended on preflight?

A

Notify maintenance

50
Q

What is the purpose and location of the upper dual boost actuators?

A

One pivoting and swiveling actuator is located in both the FWD and AFT pylon area.Each actuator is mounted to the swashplate and will hydraulically move the swashplate based off of the inputs received from the pilots and/or the DAFCS.

51
Q

Are there any buttons on the upper dual boost actuators that must be checked during preflight?

A

Yes, notify maintenance if the buttons are extended.

52
Q

How can you determine which portion of the reservoir/cooler is the cooler and which part is the reservoir?

A

Upper portion is the cooler (looks like radiator)Lower portion is the reservoir.

53
Q

What should be checked on preflight on the reservoir?

A

Check fluid level with the visual fluid indicator. Check that green band on the back is visible.

54
Q

What is the purpose of the bleed/relief valve on the reservoir?

A

Protects the reservoir from over pressurization and automatically opens to prevent over pressurizing.It also allows for air to be manually bled from the reservoir.

55
Q

What are the two sides of the PTU and what is the difference in each side?

A

Utility Hydraulic Side (motor)Flight Hydraulic Side (pump)The motor side is operated from the utility hydraulic system. It is connected mechanically to the pump side by a shaft. When the PTU is turned on from the cockpit, the motor portion of the PTU will turn, the shaft inside the motor will spin making the pump also spin. The pump can now move the flight hydraulic fluid which will pressurize the flight hydraulic system for ground operations prior to engine start and emergencies.

56
Q

What is the purpose of the PTUs?

A

To pressurize the flight hydraulic system for ground operations prior to engine start and emergencies.

57
Q

When will the flight hydraulic pumps provide hydraulic pressure to the system?

A

Once the engines are started.

58
Q

What are the two drains on the flight hydraulic pumps and the purpose of each?

A

Seal Drain - if the seal on the pump or transmission starts to leak.Case Drain - the condition of the pump can be monitored for an impending failure.

59
Q

What are the buttons on the power control modules that should be checked during preflight?

A

A switch on the return side (one)Buttons on the bottom of each filter (two)

60
Q

How can the proper accumulator pressure on the power control module be checked on preflight?

A

Use chart in checklist.

61
Q

What is the purpose and proper use of the FLT CONTR switch?

A

The switch is used only during the flight control hydraulic check on the run up. The normal position for the switch is BOTH and should remain in that position during flight.

62
Q

What does the HYD 1 FLY CONTR or HYD 2 FLT CONTR caution indicate?

A

The pressure on the respective system is below the normal pressure range.When pressure drops below 1800 psi the caution will become activeThe caution will be inactive when pressure rises above 2300 psi

63
Q

If the HYD FLT CONTR caution is active, what other caution will also be active?

A

AFCS 1 FAIL and/or AFCS 2 FAIL

64
Q

What flight hydraulic indications are on the maintenance panel?

A

Pressure gauges (indications)Temperature gauges (indications)Reservoir levels (No.1 and No.2)Filter change lightsPump fault lights

65
Q

What is the temperature caution range for the flight hydraulic systems?

A

95 to 120* C

66
Q

What is the temperature limit for the flight hydraulic systems?

A

120* C

67
Q

Where (component name on the reservoir) does the maintenance panel receive the reservoir level indication from?

A

Linear Variable Differential Transducer

68
Q

Identify what must be done to check the reservoir level during preflight on the maintenance panel?

A

The switch to the left of the gauge allows the operator to select which reservoir the gauge will indicate the level for.The battery must be connected and the level check button to the far right of the maintenance panel must be pushed in order for the gauge to work.

69
Q

What does the pump fault light on the maintenance panel indicate?

A

The lights indicate an impending failure of the respective pump.

70
Q

What does the WARNING in the operator’s manual about the PTUs state?

A

The power transfer pumps were designed for ground checkout of the flight control system and have the capacity to pressurize the system for gentle maneuvers only.Rapid control inputs must be avoided to preclude upper boost actuator stalling (binding) and/or jam button extensions.Use of the power transfer pumps in flight is restricted to these emergency conditions only.

71
Q

Can the HYD FLT CONTR caution be active without the corresponding AFCS FAIL caution?

A

No, the AFCS 1/2 FAIL cautions are controlled by the same switch that control the #1/#2 HYD FLT CONTR cautions.If the HYD FLT CONTR caution is illuminated, then the corresponding AFCS FAIL will also be illuminated.

Chegg Decks (24 decks)

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