AIR81B: Hydrocarbon-Based Hydraulic Fluid Properties - SAE International
Browse Standards AIR81B
Historical REVISED 2000-12-01

Hydrocarbon-Based Hydraulic Fluid Properties AIR81B

This document discusses the relative merits of the properties of hydrocarbon-based hydraulic fluid in relation to the fluid formulation, aerospace hydraulic system design and the related materials compatibility. In some cases, numerical limits are suggested, but, in general, the effect of a property is noted qualitatively.
The properties of the fluid must be considered in the design of a hydraulic system, but it is possible to design a system to be less sensitive, or more robust, to a particular fluid property. For this reason, the property of the hydraulic fluid must be weighed for each individual hydraulic system, taking into account the system's basic design, function and environment, as well as the fluid toxicity and disposal issues. Besides the hydraulic system itself, ground handling and servicing needs of the system must also be considered.
The only absolute characteristic of a hydraulic fluid is that it be a liquid throughout the range of use. All other fluid properties must be considered in hydraulic system design. See MIL-HDBK-118.
Phosphate ester-based hydraulic fluids, not covered in this document, have some unique properties which need to be considered separately. See AS1241 for information on phosphate ester-based hydraulic fluids.
AIR81D
2016-04-20
Latest
Stabilized
AIR81
2011-08-10
Historical
Reaffirmed
AIR81C
2011-02-08
Historical
Revised
AIR81B
2000-12-01
Historical
Revised
AIR81A
1995-03-01
Historical
Revised

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