Hydraulic and Pneumatic Power Systems Flashcards
What color is mineral based hydraulic fluid?
red
What would cause a hydraulic filter to go into open bypass, allowing unfiltered fluid into the system?
a clogged filter
What is used in some hydraulic systems to supplement the power of the pump when several items are moved at the same time?
an accumulator
What must be accomplished with any accumulator prior to disassembling?
discharge all air or nitrogen
What are three types of hydraulic fluid?
vegetable, mineral, phosphate
What precautions should be taken to minimize contamination during replacement of a hydraulic unit?
clean tools, clean area, plug lines, replace all seals and gaskets
What are sources of hydraulic pressure in aircraft?
hand pump, electric pump, engine driven pump
What are the methods of pressurizing a hydraulic reservoir?
engine bleed air, or hydraulic pressure
What happens to plastic resins, vinyl composites, lacquers, and oil based paints if exposed to a phosphate ester base hydraulic fluid such as “Skydrol”?
melts, destroys, and degrades
What feature is built into a hydraulic pump drive system to prevent engine damage in the event of a pump seizure or overload?
shear shaft
What happens to excessive pressure in a pneumatic system?
it is pumped overboard
What are sources of pneumatic power?
compressor, bleed air, high pressure bottles
For what purposes are pneumatic systems used in some aircraft?
de-icing, actuation, air conditioning, supplemental oxygen
What are different types of accumulators?
diaphragm piston
what is the purpose of a pressure regulator?
to manage the output pressure of the pump
