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Aerospace Hydraulic Fluids Physical Properties

A-6C3 Fluids Committee
  • Aerospace Standard
  • AIR1362D
  • Current
Published 2018-08-16 by SAE International in United States
This SAE Aerospace Information Report (AIR) presents data on hydraulic fluids which are of interest to detail designers of hydraulic systems and components for aerospace flight vehicles. The data pertains to fluids conforming to the following specifications: MIL-PRF-5606 MIL-H-8446 MIL-PRF-27601 (canceled) MIL-PRF-27601 has been canceled without replacement and the data presented herein is for information purposes only. MIL-PRF-83282 MIL-H-53119 MIL-PRF-87257 AS1241 Type IV, Classes 1 and 2, and Type V
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Air in Aircraft Hydraulic Systems

A-6C3 Fluids Committee
  • Aerospace Standard
  • AIR5829
  • Current
Published 2018-01-19 by SAE International in United States
This SAE Aerospace Information Report (AIR) discusses the forms that air may take in aircraft hydraulic systems. Further, the effects of the various air forms on system operation are addressed. Recommended system design to prevent air effects and maintenance procedures to prevent and remove air are provided. Nitrogen leakage from accumulators is also a source of gas in hydraulic systems and may compose a portion of the “air” in the hydraulic system. The term “air” in this report does not differentiate between a gas composed strictly of normal atmospheric air or one that includes a mixture of additional nitrogen as well. The discussions of the report apply equally with any proportions of atmospheric air and nitrogen in the system.
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Aerospace Hydraulic Fluids Physical Properties

A-6C3 Fluids Committee
  • Aerospace Standard
  • AIR1362C
  • Historical
Published 2016-11-01 by SAE International in United States
This SAE Aerospace Information Report (AIR) presents data on hydraulic fluids which are of interest to detail designers of hydraulic systems and components for aerospace flight vehicles. The data pertains to fluids conforming to the following specifications: MIL-PRF-5606 MIL-H-8446 MIL-PRF-27601 (canceled) MIL-PRF-27601 has been canceled without replacement and the data presented herein is for information purposes only. MIL-PRF-83282 MIL-H-53119 MIL-PRF-87257 AS1241 Type IV, Classes 1 and 2, and Type V
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Fire Resistant Phosphate Ester Hydraulic Fluid for Aircraft

A-6C3 Fluids Committee
  • Aerospace Standard
  • AS1241D
  • Current
Published 2016-09-16 by SAE International in United States
This document establishes the requirements for physical and chemical properties and the minimum tests to evaluate suitability of phosphate ester hydraulic fluids for use in aircraft systems where fire resistance is required. Additional tests may be specified by the qualifying agency to demonstrate compliance with their specific requirements. The "qualifying agency" will be defined herein to be the airframe manufacturer submitting certification approval for use of the fluid in a specific model airplane. Fluids meeting the requirements of this specification may be approved by a qualifying agency for use on specific airplane models. Data used to show compliance to this specification can be used by the qualifying agency to show compliance to the applicable regulations for the appropriate certifying authority; e.g., FAA, EASA, etc.
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Importance of Physical and Chemical Properties of Aircraft Hydraulic Fluids

A-6C3 Fluids Committee
  • Aerospace Standard
  • AIR81D
  • Current
Published 2016-04-20 by SAE International in United States
This document discusses the relative merits of the physical and chemical properties of hydraulic fluids in relation to the aerospace hydraulic system design, and the related materials compatibility. The discussion in this report applies both to hydrocarbon and phosphate ester based aircraft hydraulic fluids. In some cases, numerical limits are suggested, but, in general, the significance and effect of a property is noted qualitatively.
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Aerospace - Chlorinated Solvent Contamination of MIL-H-5606/MIL-H-83282 Vehicle Hydraulic Systems

A-6C3 Fluids Committee
  • Aerospace Standard
  • AIR4713A
  • Current
Published 2013-06-18 by SAE International in United States
Although there is controversy regarding the chemical form of chlorine and its relation to harmful effects in the hydraulic fluid (i.e., chloride ions versus organic chloro-compounds versus total chlorine in all forms), it is generally agreed that total chlorine content should be measured and controlled. In the near future, the ban on the manufacture of chlorinated solvents, out of concern for depletion of the ozone layer, may in itself diminish or eliminate chlorine contamination related aircraft malfunctions. It is generally accepted that hydraulic fluid contamination should be held to a minimum under all conditions. The benefits of low contamination levels are improved performance, lower maintenance due to lower wear, corrosion and erosion, longer fluid life, longer component life, etc. Contaminants can be classified into two general types: those that are insoluble and those that are soluble in the hydraulic fluid. The insoluble solid type is most common and is usually referred to as particulate matter. Its measurement and removal have been the subject of much investigation and standardization which is well documented in technical literature.…
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Compendium of Gas Properties

A-6C3 Fluids Committee
  • Aerospace Standard
  • AIR4093A
  • Current
Published 2013-06-18 by SAE International in United States
No Abstract Available.
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Fluid Properties

A-6C3 Fluids Committee
  • Aerospace Standard
  • AIR1116B
  • Current
Published 2013-06-18 by SAE International in United States
This report summarizes data relative to liquid fluids and their properties which are of interest to Aerospace Fluid Power technologists.
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Degradation Limits of Hydrocarbon-Based Hydraulic Fluids, MIL-PRF-5606, MIL-PRF-83282, and MIL-PRF-87257 Used in Hydraulic Test Stands

A-6C3 Fluids Committee
  • Aerospace Standard
  • AIR810D
  • Current
Published 2013-04-22 by SAE International in United States
This SAE Aerospace Information Report (AIR) presents data on normally accepted changes in physical properties and contamination levels for military hydraulic fluids used in hydraulic test stands. This information is of importance to all users of hydraulic test stands to assure the performance data obtained on these test stands for specific components will not be adversely affected by excessive changes in fluid properties or contamination levels. The data pertains to fluids conforming to specifications MIL-PRF-5606, MIL-PRF-83282, and MIL-PRF-87257. The guidelines incorporated in the AIR are the general consensus values of knowledgeable professionals. However, the experience and judgment of engineers and operators responsible for the equipment must be relied upon to determine when the hydraulic fluid is to be replaced.
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Importance of Physical and Chemical Properties of Aircraft Hydraulic Fluids

A-6C3 Fluids Committee
  • Aerospace Standard
  • AIR81
  • Historical
Published 2011-08-10 by SAE International in United States

This report discusses the characteristics of hydraulic fluids and evaluates their importance, not only from the standpoint of fluid formulation, but also in their effect on aero-space hydraulic system design and the materials used in the components of the system. In some cases numerical parameter limits are suggested, but, in general, the effect of a parameter is the basic consideration.