Search Results

Standard

Aerospace Microscopic Sizing and Counting of Particulate Contamination for Fluid Power Systems

2024-01-09

CURRENT

AS598A

This SAE Aerospace Standard (AS) defines the materials, apparatus and procedure for microscopic sizing and counting of particulate contamination of fluid power systems by membrane filtration using microscopic counting.

Standard

Fluid Properties

2021-07-20

CURRENT

AIR1116C

This report summarizes data relative to liquid fluids and their properties which are of interest to Aerospace Fluid Power technologists.

Standard

Procedure for the Determination of Particulate Contamination in Hydraulic Fluids by the Control Filter Gravimetric Procedure

2020-12-03

CURRENT

ARP785B

This ARP describes a gravimetric method for the determination of particulate contaminant in hydraulic fluids by the control filter technique. NOTE: With this method, detectable contamination levels down to 0.2 mg (7.0 × 10-6 ounces) per sample can be obtained with a standard deviation of ±0.1 mg (±3.5 × 10-6 ounces).

Standard

Degradation Limits of MIL-PRF-5606, MIL-PRF-83282, and MIL-PRF-87257 Hydraulic Fluids Used in Hydraulic Test Stands

2020-10-14

CURRENT

AIR810E

This SAE Aerospace Information Report (AIR) presents data on normally accepted changes in physical properties and contamination levels for MIL-PRF-5606, MIL-PRF-83282, and MIL-PRF-87257 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.

Standard

Filter Element Cleaning Methods

2020-10-09

CURRENT

AIR787B

This SAE Aerospace Information Report (AIR) provides technical information to assist the development of specific cleaning methods for those filter elements which are designated as "cleanable" and cannot be cleaned by simple and obvious procedures.

Standard

Filter Patch Testing Procedures for Aerospace Hydraulic Non-Rotating Equipment

2019-07-15

CURRENT

ARP1302A

This SAE Aerospace Recommended Practice (ARP) provides a procedure for obtaining filter patch test samples from the following types of aerospace non-rotating hydraulic equipment: Mechanical/Hydraulic Units Electro/Hydraulic Units Pneumatic/Hydraulic Units

Standard

Importance of Physical and Chemical Properties of Aircraft Hydraulic Fluids

2016-04-20

HISTORICAL

AIR81D

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.

Standard

Fluid Properties

2013-06-18

HISTORICAL

AIR1116B

This report summarizes data relative to liquid fluids and their properties which are of interest to Aerospace Fluid Power technologists.

Standard

Degradation Limits of Hydrocarbon-Based Hydraulic Fluids, MIL-PRF-5606, MIL-PRF-83282, and MIL-PRF-87257 Used in Hydraulic Test Stands

2013-04-22

HISTORICAL

AIR810D

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.

Standard

Importance of Physical and Chemical Properties of Aircraft Hydraulic Fluids

2011-02-08

HISTORICAL

AIR81C

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.

Standard

Fluid Properties

2007-11-29

HISTORICAL

AIR1116A

This report summarizes data relative to liquid fluids and their properties which are of interest to Aerospace Fluid Power technologists.

Standard

Aircraft Air Compressor Lubricating Oil

2002-12-16

CURRENT

ARP664

Standard

Hydrocarbon-Based Hydraulic Fluid Properties

2000-12-01

HISTORICAL

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.

Standard

Aerospace Fluid Power - Cleanliness Classification for Hydraulic Fluids

2000-08-01

HISTORICAL

AS4059C

This SAE Aerospace Standard (AS) defines cleanliness levels for particulate contamination of hydraulic fluids and includes methods of reporting data relating to the contamination levels. The contamination levels selected are an extension of the widely accepted NAS 1638 cleanliness levels.

Standard

HYDROCARBON-BASED HYDRAULIC FLUID PROPERTIES

1995-03-01

HISTORICAL

AIR81A

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.

Standard

AEROSPACE-CLEANLINESS CLASSIFICATION FOR HYDRAULIC FLUIDS

1995-03-01

HISTORICAL

AS4059B

This SAE Aerospace Standard (AS) defines cleanliness levels for particulate contamination of hydraulic fluids and includes methods of reporting data relating to the contamination levels. The contamination levels selected are an extension and simplification of the widely accepted NAS 1638.

Standard

PARTICLE COUNT DATA CONVERSION AND EXTRAPOLATION

1993-01-01

HISTORICAL

AIR877

This report describes a mathematical model which can be used to analyze particle count data. Particle counts which fit the model can be graphically displayed. converted from one counting size-frequency range to another, and extrapolated to estimate counts beyond the measured range. Derivation, applications and calculations are described.

Standard

FLUID PROPERTIES

1992-07-01

HISTORICAL

AIR1116

This report summarizes data relative to liquid fluids and their properties which are of interest to Aerospace Fluid Power technologists.

Standard

PROCEDURE FOR CALIBRATION AND VERIFICATION OF A LIQUIDBORNE PARTICLE COUNTER: AN ABSOLUTE STANDARD

1991-11-01

HISTORICAL

ARP1192B

This aerospace recommended practice describes procedures for establishing a calibration curve for use with an automatic liquidborne particle counter (APC) and verifying the sizing and counting accuracy of the instrument.

Standard

FILTER PATCH TESTING PROCEDURES FOR AEROSPACE HYDRAULIC NON-ROTATING EQUIPMENT

1991-11-01

HISTORICAL

ARP1302

These recommendations are written to cover the subject of obtaining filter patch test samples from aerospace hydraulic equipment of the categories shown below. The same procedure shall apply regardless of the unit category.