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Aerospace Fluid Power - Contamination Classification for Hydraulic Fluids
- Aerospace Standard
Published May 05, 2020 by SAE International in United States
Downloadable datasets availableAnnotation ability available
This SAE Aerospace Standard (AS) defines contamination classes and levels for particulate contamination of hydraulic fluids and includes methods of reporting related data (Appendix A). The contamination levels selected are based on the widely accepted NAS 1638 cleanliness classes. The conversion from NAS 1638 cleanliness class specifications to AS4059 class specifications is defined. The comparison of the NAS 1638 classes to AS4059 classes and levels is provided and are defined and the differences explained (Appendix B). NAS 1638 classes based on weight of particles are not applicable to these classes and are not included. A contamination code has been added to describe the contamination levels of the fluid at the specified particle size ranges.
Revision F of this standard has been prepared to include comments received from the international community, principally to simplify the coding system to either a single number contamination class that is the same as the obsolete NAS 1638 class, or as a contamination code indicating the contamination levels at a number of distinct particle size ranges. Also, normative references to using the obsolete calibration procedure ISO4402 were removed.
Data Sets - Support Documents
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|TABLE 1||MAXIMUM CONTAMINATION LIMITS FOR DIFFERENTIAL PARTICLE COUNTS (PARTICLES/100 ML)|
|TABLE 2||MAXIMUM CONTAMINATION LIMITS FOR CUMULATIVE PARTICLECOUNTS (PARTICLES/100 ML)|
|TABLE 3||EXAMPLE CLASS DETERMINATION USING MICROSCOPIC DIFFERENTIAL PARTICLE COUNTS|
|TABLE 4||EXAMPLE CLASS DETERMINATION USING AUTOMATIC PARTICLE COUNTS|
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A-6C1 Fluids and Contamination Control Committee
A6C1 is responsible for the development of standards, processes, and practices related to Aerospace Fluids and Systems' cleanliness in aerospace engines, hydraulic systems and missiles, and the integration of these components for Commercial and Military air vehicles. The panel provides a forum for government engineers, prime contractors, and suppliers to exchange technical information, regulatory updates, recent technology developments, issues related to system development and in service operation and lessons learned.
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