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30 Cards in this Set
- Front
- Back
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What is the primary use for MIL-H-46170 hydraulic fluid?
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Preservative hydraulic fluid.
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What is the temperature range of MIL-H-83282 hydraulic fluid?
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–40°F to +275°F.
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Where do you annotate that you have mixed hydraulic fluid in a particular aircraft?
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Aircraft logbook.
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What is the maximum acceptable Navy Standard Class hydraulic fluid particulate for naval aircraft?
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Navy Standard Class 5.
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What manuals specify how aircraft hydraulic fluid sampling is conducted?
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Applicable MIM’s or MRC’s.
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What are the four approved lubricants to be used on O-ring seals?
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MIL-H-5606, MIL-H-83282, MIL-H-46170, and MIL-G-81322.
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What type of contamination is most often found in aircraft hydraulic systems?
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Particulate contamination.
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What unit of measurement is used for particulate matter?
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Microns.
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Oxidation of hydraulic fluid can produce what type of contaminants?
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Organic solid contamination.
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Most metallic contamination in a hydraulic system is produced by what component?
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Hydraulic pumps.
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The presence of air in a hydraulic system has what effect?
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Air causes a spongy response during system operation.
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What two factors determine if a sampling point is adequate?
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Its mechanical features and its location in the system.
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The internal porting of the sample point should not impede the passage of particulate matter up to what size?
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500 microns.
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What is the primary contamination measurement method used at all levels of maintenance?
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Patch test.
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When is the best time to take a hydraulic fluid sample?
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Immediately after flight and before shut down.
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Before taking a hydraulic fluid sample from a hydraulic test stand, you must recirculate the fluid for how long?
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5 minutes.
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How many samples should you take from each sampling point?
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Two.
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When sampling hydraulic fluid, what size test filter should you use?
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47-mm filter.
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An aircraft’s hydraulic systems should be operated a minimum of how many complete cycles while undergoing recirculation cleaning?
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15 cycles.
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Hydraulic test stands used for system flushing must be equipped with a 3-micron absolute filter and have an internal reservoir that holds how many gallons?
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16 gallons.
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Whenever possible, purging operations should be accomplished at what activity?
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NADEP (Naval Aviation Depot).
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Considering maintenance man-hours and material requirements, what is the most effective decontamination method?
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Recirculation.
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What component is used to provide a means of quickly disconnecting a line without the loss of hydraulic fluid?
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Quick-disconnect coupling.
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When the quick-disconnect coupling is disconnected, what component prevents the loss of fluid and entrance of air?
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A spring in each half closes the valve.
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A hydraulic seal that is used between two stationary items is referred to by what name?
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A gasket.
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High-operating pressures require what components to be used with O-rings?
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Backup rings.
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A damaged O-ring storage envelope should be repaired with what type of tape?
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Moisture proof, pressure-sensitive tape.
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Tools used for installing and removing O-rings should be made from what material?
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Soft metal.
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What is the shelf life of Teflon® backup rings?
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Teflon® backup rings do not have a shelf life.
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What is the purpose of a wiper in an exposed piston shaft installation?
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To clean and lubricate.
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