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Ch-47 academics exam 2 > Utility hydraulics > Flashcards

Utility hydraulics Flashcards

1
Q
  1. What is the purpose of the utility hydraulic system?
A

primarily used for ground operations

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2
Q
  1. What are the sub-systems that are operated by the utility hydraulic system?
A

Power xfer unit, APU start system, ENG start system, Cargo ramp, power steering, swivel locks, wheel brakes, center cargo hook, cargo winch/rescue hoist

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3
Q

(1) Hydraulic service module.

A

near ramp on #2 side. used to refill hydraulic system.

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4
Q

(2) Utility Reservoir/Cooler assembly.

A

aft pylon hydraulic compartment, cools hydraulic fluid

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5
Q

(3) Utility Reservoir Pressurization Accumulator. (Pre-flt pressure 2500-3500 or 3000 psi)

A

maintains pressure on utility reservoir/cooler assembly next to utility reservoir

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6
Q

(4) Utility System Hand pump.

A

next to ramp #2 side, used to re-pressurize start accumulator

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7
Q

(5) Electric Pump for the Utility System Hydraulic Accumulator (EPUSHA).

A

next to system hand pump, electrically recharges start accumulator

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8
Q

(6) APU Start Accumulator. (Pre-flt pressure 2500-3500 or 3000 psi)

A

2 side above ramp, used to hold hydraulic pressure to start APU

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9
Q

(7) Auxiliary Power Unit (APU) Motor/Pump.

A

On the APU to start turbine and above 90% work as a pump to create pressure

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10
Q

(8) APU Start Module. (Pre-flt pressure 2500-3500 or 3000 psi)

A

2 side above ramp, Stops the start accumulator from discharging

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11
Q

(9) Utility Hydraulic Aft Transmission Driven Pump.

A

located of aft transmission, main pump to provide pressure to hydraulic system

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12
Q

(10) Flight Hydraulic Power Transfer Unit (PTU).

A

located in forward and aft pylon, provide pressure for flight control hydraulic system.

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13
Q

(11) Auxiliary Ground Power Unit (AGPU).

A

not on the aircraft, provides pressure and electricity as needed

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14
Q

(12) Utility Hydraulic Pressure Control Module.

A

on #1 side above ramp, controls where hydraulic pressure is sent and filters fluid also monitors pressure

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15
Q

(13) Utility Hydraulic Return control module.

A

2 side above ram, filters return fluid and gathers fluid from systems

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16
Q

(14) Brake Accumulator

A

forward pylon, holds pressure emergency brake applications

17
Q

(15) Power Steering Module.

A

2 side on wall near ramp, for emergency swivel lock operation

18
Q

(16) Utility Hydraulic Control Panels.

A

located on overhead console, used to control pressure to subsystems (check for systems)

19
Q

(17) Maintenance panel.

A

2 side on wall next to ramp, shows system information for all hydraulic systems

20
Q
  1. What are the four sources of pressure for the utility hydraulic system?
A

APU start accumulator, APU motor pump, Utility hydraulic system pump, AGPU

21
Q
  1. When can the fill module be used to add fluid to the hydraulic systems?
A

on ground or in flight

22
Q
  1. What could happen if the fluid level is allowed to go below the sight glass while using the fill module?
A

you will start pumping air into the hydraulic system

23
Q
  1. What is the purpose of the visual fluid indicator on the hydraulic reservoir?
A

to let you know if you need to add fluid to the system

24
Q
  1. What should the gauge indication be on the utility reservoir pressurization accumulator be during pre-flt?
A

in the green band

25
Q
  1. When should a pilot use the utility reservoir depressurization valve?
A

never

26
Q
  1. Why should EPUSHA operations not exceed five?
A

it will kill the battery

27
Q
  1. What should the pressure indicate during pre-flt on the APU start accumulator?
A

3,000 PSI

28
Q
  1. What is the Emergency Utility Pressure Valve used for and what position should the valve be in during pre-flt?
A

NORMAL, allows the APU start accumulator or hand pump to pressurize system

29
Q
  1. What should the pressure indicate during pre-flt on the APU start module accumulator?
A

approx. 3,000 PSI

30
Q
  1. When would the APU motor pump be used during flight?
A

when the transmission driven utility pump fail during flight

31
Q
  1. What component provides the utility hydraulic systems pressure in flight, under normal conditions?
A

utility hydraulic pump

32
Q
  1. What provides the utility hydraulic pressure indications to the crew?
A

the pressure control module

33
Q
  1. What should be checked on the pressure control module during pre-flt?
A

general condition and security

34
Q
  1. What should be checked on the return control module during pre-flt?
A

general condition and security

35
Q
  1. What indications are provided on the maintenance panel for the utility hydraulic system?
A

pressure, temp, reservoir level, filter change, pump fault

Ch-47 academics exam 2 (6 decks)

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