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CH-47 (9.4) > Utility Hydraulics > Flashcards

Utility Hydraulics Flashcards

1
Q

What is the purpose of the utility hydraulic system?

A

To provide hydraulic pressure to operate sub systems for ground operations and some emergencies

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2
Q

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

A
  • Power transfer units
  • APU starting System
  • Engine starter System
  • cargo ramp
  • power steering
  • swivel locks
  • wheel brakes
  • center cargo hook
  • cargo winch

-10, pg. 2-75

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3
Q

What are the 17 major components in the utility hydraulic system?

A
  • Hydraulic service module
  • Utility reservoir/cooler assembly
  • Utility Reservoir pressurization accumulator
  • Utility system hand pump
  • Electric pump for the utility system Hydraulic accumulator(EPUSHA)
  • APU start accumulator
  • APU motor/pump
  • APU start module
  • utility hydraulic aft transmission driven pump
  • PTU’s
  • AGPU (auxiliary ground power unit)
  • utility hydraulic pressure control module
  • utility hydraulic return control module
  • brake accumulator
  • power steering module
  • utility hydraulic control panels
  • maintenance panel
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4
Q

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

A
  • APU start accumulator
  • APU motor/pump
  • utility hydraulic system pump
  • auxiliary ground power unit
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5
Q

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

A

Air could get into the system

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6
Q

When should the pilot use the utility reservoir depressurization Valve?

A

NEVER

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7
Q

To ensure battery power is available to start the APU, the number of EPUSHA operations should not exceed ____.

A
  1. The actual number of operations will depend on battery condition, temperature, and pump condition.

-10, pg. 2-79

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8
Q

When will the APU be used during flight?

A

Only during emergencies

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9
Q

What component provides the utility hydraulic system Pressure In Flight, under normal conditions?

A

Utility hydraulic system aft transmission pump

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10
Q

Identify the five accumulators in the utility hydraulic system

A
  • APU start accumulator
  • APU start module accumulator
  • PWR steering accumulator
  • Brake accumulator
  • Utility reservoir pressurization accumulator
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CH-47 (9.4) (48 decks)

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