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29 Cards in this Set
- Front
- Back
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How are aircraft hydraulic systems designed?
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To produce and maintain a given pressure over the entire range of required fluid flow rates
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What is the pressure used in most Navy high performance aircraft?
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3,000psi
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What is the primary use of hydraulic fluids in aircraft hydraulic systems
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To transmit power, but they must perform other functions.
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How is hydraulic fluid contamination defined?
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As nay foreign material or substance whose presence in the fluid is capable of adversely afftecting the system performance or reliability.
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What is the principal hydraulic fluid used in military aircraft?
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MIL-H-83828.
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Where are hydraulic fluids MIL-H-5606, MIL-H-83282, and MIL-H-81019 used?
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In automatic pilots, shock absorbers, brakes, control mechanisms, servo control systems, and other hydraulic systems using seal materials compatible with petroleum-based fluids.
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What is the primary use for hydraulic fluid MIL-H-46170?
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As a preservative fluid for hydraulic systems and components storage.
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Why are hydraulic fluids dyed red?
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So it can be distinguished from incompatible fluids.
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What constitutes the hydraulic fluid MIL-H-83282?
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A synthetic hydrocarbon base that contains additives to provide the required viscosity and anti-wear characteristics, which inhibit oxidation and corrosion.
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What is the temperature range of MIL-H-83282
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-40 degrees F to +275 degrees F.
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How much does the flash point, fire point, and spontaneous ignition temperature of MIL-H-83282 exceed that of MIL-H-5606
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More than 200 degrees F.
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Why was the oxidation inhibiter added to hydraulic fluid?
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To reduce the amount of oxidation that occurs in petroleum-based fluid when they are subjected to high pressure and high temperature, and to minimize corrosion of metal parts due to oxidation and resulting acids.
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What type of hydraulic fluid is used in aircraft when extremely low surrounding temperatures are expected?
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MIL-H-81019.
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When is hydraulic fluid MIL-H-81019 interchangeable with hydraulic fluid MIL-H-5606 and MIL-H- 83282?
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In extreme emergencies.
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What is the temperature range of MIL-H-81019?
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-90 degrees F to +120 degrees F.
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What is the primary use of MIL-H-81019?
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As a preservative fluid for hydraulic systems and components.
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What fluid is also used as a testing medium in stationary test stands that have a temperature range between -40 degrees F to +275 degrees F?
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MIL-H-4617.
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When mixing or combining hydraulic fluids, where is the information annotated when this is done?
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In the aircraft logbook or S/E logs and records
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What is the major cause of hydraulic system and component failure in Navy and Marine corps aircraft and related support equipment (SE)?
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Hydraulic contamination
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The Hydraulic Contamination Control Program is defined in what manual?
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Naval Aviation Maintenance Program and OPNAVIST 4790.2 series.
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What has been established to define and control hydraulic contamination levels?
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Contamination measurement standards and acceptability limits.
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What is the maximum acceptable Navy Standard Class hydraulic fluid particulate level for naval aircraft and related support equipment?
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Class 5 for naval aircraft and Class 3 for related SE.
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What manuals specify how aircraft hydraulic fluid sampling is conducted?
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THe applicable maintenance instruction manual, maintenance requirement cards, and rework specification.
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How is the contamination level of a particular system determined?
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By analysis of a fluid sample drawn from the system, and analysis, is accomplished at all levels of maintenance through the use of Contamination Analysis Kit 57L414.
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What is ensured by hydraulic fluid contamination controls?
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The cleanliness and purity of fluid sample drawn from the system, and analysis is accomplished at all levels of maintenance through the use of Contamination Analysis Kit 57L414.
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What is ensured by hydraulic fluid contamination controls?
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The cleanliness and purity of fluid in the hydraulic system.
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When is fluid sampling and analysis performed?
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Periodically or anytime hydraulic contamination is suspected.
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When is replacement of aircraft hydraulic system filter elements accomplished?
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On a scheduled or conditional basis depending upon the requirements of the specific system.
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Why is a differential pressure flow check and bubble point test performed?
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To properly evaluate the condition of a cleanable filter element, and to verify that the element , and to verfy that the element is good before it is installed in a system or component.
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