Hydrulic & Pneumatic Power Systems Flashcards

1
Q
  1. What are the three principal categories of hydraulic fluids?
A

Mineral (5606)
Phosphate ester (Skydrol)
Polyalphaolefin (83282)

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2
Q
  1. What is the color of mineral based hydraulic fluid?
A

Red

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3
Q
  1. How do you determine which type of hydraulics fluid to use in a specific system?
A

Aircraft maintenance manual or plate attached to reservoir

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4
Q
  1. What will happen to the seals in a vegetable bees hydraulic system if it is serviced with mineral or phosphate ester based fluids?
A

Seals will swell, break down, & block system

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5
Q
  1. When installing a chevron seal what must be considered?
A

Seal is directional & install with pressure going toward the open side of seal

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6
Q
  1. When hydraulic lines have been disconnected, what precaution should be taken to prevent contamination of the system?
A

Hyd. Lines & fittings should be capped or plugged immediately

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7
Q
  1. What happens to the hydraulic fluid flow if the filter element becomes clogged with foreign matter?
A

Bypass valve routes hydraulic fluid from inlet to outlet port

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8
Q
  1. What is a micro filter?
A

Filter with paper element

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9
Q
  1. Name the filters used in aircraft pneumatic systems?
A

Paper pleated & screen type

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10
Q
  1. Why are some hydraulic reservoirs pressurized?
A

Ensure positive flow to the pumps & high altitudes

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11
Q
  1. What methods are used to pressurize hydraulic reservoirs?
A

Variable displacement pump
Engine bleed air
Hydraulic system pressure on piston in reservoir
Aspirator or Venturi

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12
Q
  1. What are the two types of accumulator housing?
A

Spherical & cylinder

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13
Q
  1. Name three types of hydraulic accumulators?
A

Diaphragm
Bladder
Piston

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14
Q
  1. What is the purpose of a pressure relief valve in a.hydraulic system?
A

Limit amount of pressure within the system

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15
Q
  1. What is the purpose of an unloading valve in a hydraulic system?
A

Provides low pressure path from pump to reservoir when system has not flow requirements

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16
Q
  1. What is the function of a wing flaps overload valve?
A

Prevents structural damage to the flaps from lowering at excessive speeds

17
Q
  1. What is the purpose of the shear-able section in a hydraulic pump?
A

Disconnect the pump from engine so engine can run

18
Q
  1. What are two different types of hydraulic pumps?
A

Hand & power pumps

19
Q
  1. What pump is most suitable for low pressure pneumatic systems?
A

Vane Type pump

20
Q
  1. What protects a direct pressure type hydraulic pressure gauge from pressure surges?
A

Dampening device (small restrictor)

21
Q
  1. What are pneumatic systems used for in aircraft?
A

Operate brakes
Open close doors
Starting
Pump driving
Emergency devices

22
Q
  1. What happens to the air after a pneumatic system is operated?
A

Air is dumped overboard

23
Q
  1. Why should a pneumatic system be purged periodically?
A

Remove contamination, moisture, or oil from components & lines

24
Q
  1. What is the purpose or the relief valve in a pneumatic system?
A

Protects against over pressurization

25
Q
  1. What is the purpose of an accumulator?
A

Prevent hydraulic system shock when under high load demand

26
Q
  1. What would cause a hydraulic filter to go into full bypass mode allowing unfiltered fluid into the system?
A

Clogged filter