Flashcards on Aircraft Hydraulic and Pneumatic Systems
Aircraft Hydraulic and Pneumatic Systems: A Student Guide
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Aircraft Hydraulic Systems
20 cards
Card 1
Question: What are the two basic types of hydraulic fluid used in modern aircraft?
Answer: Mineral-base fluid and phosphate-ester-base fluid.
Card 2
Question: What kind of filter is a micronic filter?
Answer: A filter with a special paper element.
Card 3
Question: From where does the main hydraulic pump normally take its fluid?
Answer: From a standpipe in the reservoir.
Card 4
Question: From where does the emergency hydraulic pump take its fluid?
Answer: From the bottom of the reservoir.
Card 5
Question: Why are some hydraulic reservoirs pressurized?
Answer: To ensure fluid is supplied to pump inlets at high altitude where atmospheric pressure is insufficient.
Card 6
Question: What is the difference between an open-center selector valve and a closed-center selector valve?
Answer: Open-center valves are installed in series and allow fluid to flow through the center when idle (acting as pump unloading). Closed-center valves are i
Card 7
Question: What solvent is used to flush a hydraulic system that uses Skydrol (phosphate-ester) fluid?
Answer: Trichloroethylene (TCE).
Card 8
Question: What solvents are used to flush a hydraulic system that uses mineral-base hydraulic fluid?
Answer: Naphtha, Varsol, or Stoddard solvent.
Card 9
Question: What is used to remove phosphate-ester (Skydrol) fluid from aircraft tires?
Answer: Soap and water.
Card 10
Question: What must be done to hydraulic lines that are disconnected during servicing?
Answer: They must be capped with the correct fluid line cap or plug; never use masking tape or other adhesive tape.