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AIRFRAME 08

Hydraulic & Pneumatic Power Systems

QuestionAnswer
What are three types of hydraulic fluids? Minerals, polyalphaolefins, and phosphate esters
What color is mineral base hydraulic fluid? Red
What happens to plastic resins, vinyl compositions, lacquers, and oil base paints if exposed to a phosphate ester base hydraulic fluid such as Skydrol? The material will be damaged, softened and or peeled
What feature is built into a hydraulic pump-drive system to prevent engine damage in the event of pump seizure or overload? A shear section in the pump-drive shaft
What precautions should be taken to maximize contamination during replacement of hydraulic unit? All lines should be plugged or capped after disconnecting
What would cause hydraulic filter to go into open bypass, allowing unfiltered fluid into the system? A clogged filter
How does a gear-type power pump operate? Two meshed gears revolved in a housing and are driven by a power unit. Fluid is trapped and pressurized as the gears turn
What are two types of engine-driven hydraulic pumps? Constant-delivery and variable delivery
What is the purpose of a pressure relief valve? To limit the amount of pressure, thereby preventing failure of the system components
What is the purpose of a pressure regulator? To manage the output of the pump to maintain system pressure and allow pump to turn with out resistance
What is used in some hydraulic systems to supplement the power pump when several units are operated at the same time? An accumulator
What are the different types of accumulators? Spherical and cylindrical
For what purposes are pneumatic systems used in some aircraft? To operate brakes, doors, drive pumps, and engine starting
What are sources of pneumatic power? Storage bottles, vane-type pumps, and turbine engine compressors
What happens to excessive pressure in a pneumatic system? A relief valve will bleed it to the atmosphere
What is the purpose of restrictors that are used in aircraft pneumatic systems? To control the rate of airflow
Why should pneumatic systems be purged periodically? To remove contamination and moisture
What must be accomplished with any accumulator prior to disassembling? Make sure the air or preload has been discharged
Created by: Chisum
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