Importance of Physical and Chemical Properties of Aircraft Hydraulic Fluids

Standard:
Revised:
  • 2011-02-08
 
  • HISTORICAL Access the latest revision: AIR81D
Publisher:
  • SAE International
Pages:
11
Scope:

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.

Rationale:

The update implements multifold revisions to the document. The title was changed to describe better the content of the document, which discusses the significance and relevance of aircraft hydraulic fluid properties, rather than being an compilation of typical fluid properties. Scope was extended to include phosphate ester hydraulic fluids used in commercial aircraft. Referenced test methods and property descriptions were updated, where appropriate. Sections that did not relate to physical and chemical properties of aircraft hydraulic fluids were deleted.

History:
Standard Published Revision Status
AIR81D 2016-04-20 Latest Stabilized
2011-08-10 Historical Reaffirmed
2011-02-08 Historical Revised
2000-12-01 Historical Revised
1995-03-01 Historical Revised
AKA:
  • SAE AIR 81
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