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Standard

Secondary Filters for Fluid System Reliability

2004-12-01
HISTORICAL
AIR4057A
This SAE Aerospace Information Report (AIR) discusses the design choices and engineering trade-offs available to the system designer in the efficient selection and application of Last-Chance filters in contrast to main or primary system filters.
Standard

Secondary Filters for Fluid System Reliability

2012-09-24
CURRENT
AIR4057B
This SAE Aerospace Information Report (AIR) discusses the design choices and engineering trade-offs available to the system designer in the efficient selection and application of Last-Chance filters in contrast to main or primary system filters.
Standard

SECONDARY FILTERS FOR FLUID SYSTEM RELIABILITY

1994-05-01
HISTORICAL
AIR4057
It discusses the design choices and engineering trade-offs available to the system designer in the efficient selection and application of Last-Chance filters in contrast to main or primary system filters.
Standard

PROCEDURE FOR THE DETERMINATION OF PARTICULATE CONTAMINATION OF HYDRAULIC FLUIDS BY THE PARTICLE COUNT METHOD

1991-11-01
HISTORICAL
ARP598
This test describes a self-checking procedure for the determination of particulate contaminant five microns or greater in size in hydraulic fluids by the particle count method. A maximum variation of two to one (±33% of the average of two runs) in results should be expected for replicate counts on the same sample, providing that the procedure is followed closely and the precautions presented on pages 10 and 11 of the procedure, regarding manipulation, check samples and self-checking aspects, are observed.
Standard

PROCEDURE FOR THE DETERMINATION OF PARTICULATE CONTAMINATION OF AIR IN DUST CONTROLLED SPACES BY THE PARTICLE COUNT METHOD

1962-08-30
HISTORICAL
ARP743
This test describes a self-checking procedure for the determination of particulate contaminant five microns or greater in size in air by the particle count method. A maximum variation of two to one (±33% of the average of two runs) in results should be expected for replicate counts on the same sample, providing that the procedure is followed closely and the precautions presented regarding check samples and self-checking aspects are observed.
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

Methods for Evaluating Cryogenic Filters

2002-03-23
HISTORICAL
ARP900A
The purpose of this test procedure is to present test methods that can be utilized to evaluate the filtration and operating characteristics of filters that will be utilized in a cryogenic system. The methods presented herein are intended to supplement standard filter testing specifications to allow evaluation of filter performance characteristics in areas that could be affected by extreme low temperatures. The test methods can be utilized to evaluate filters up to and including 60 gpm (230 lpm) capacity. If higher flow rate filters are to be evaluated in accordance with the test methods presented herein, it will be necessary to increase the system flow capacity and the size of effluent sampling system.
Standard

Methods for Evaluating Cryogenic Filters

2011-12-19
HISTORICAL
ARP900B
The purpose of this document is to present test methods that can be utilized to evaluate the filtration and operating characteristics of filters that will be utilized in a cryogenic system. The methods presented herein are intended to supplement standard filter testing specifications to allow evaluation of filter performance characteristics in areas that could be affected by extreme low temperatures. The test methods can be utilized to evaluate filters for particle sizes equal to or greater than 5.0 μm and flows up to and including 60 gpm (230 L/min) capacity. If higher flow rate filters are to be evaluated in accordance with the test methods presented herein, it will be necessary to increase the system flow capacity and the size of effluent sampling system from those recommended in this document.
Standard

Methods for Evaluating Cryogenic Filters

2019-12-03
CURRENT
ARP900C
The purpose of this document is to present test methods that can be utilized to evaluate the filtration and operating characteristics of filters that will be utilized in a cryogenic system. The methods presented herein are intended to supplement standard filter testing specifications to allow evaluation of filter performance characteristics in areas that could be affected by extreme low temperatures.
Standard

METHODS FOR EVALUATING CRYOGENIC FILTERS

1975-07-01
HISTORICAL
ARP900
The purpose of this test procedure is to present test methods that can be utilized to evaluate the filtration and operating characteristics of filters that will be utilized in a cryogenic system. The methods presented herein are intended to supplement standard filter testing specifications to allow evaluation of filter performance characteristics in areas that could be affected by extreme low temperatures. The test methods can be utilized to evaluate filters up to and including 60 GPM (330 liters per minute) capacity. If higher flow rate filters are to be evaluated in accordance with the test methods presented herein, it will be necessary to increase the system flow capacity and the size of effluent sampling system.
Standard

Liquid Filter Ratings, Parameters and Tests

2021-04-29
CURRENT
AIR887C
This SAE Aerospace Information Report (AIR) identifies and explains the meaning of various ratings and terms used to describe the physical characteristics of liquid filter elements. The significance of various filter parameters is discussed. In addition, a number of filter test methods are briefly described. This AIR and the data presented are only applicable where the system liquid wets the filter elements.
Standard

LIQUID FILTER RATINGS, PARAMETERS AND TESTS

1993-02-03
HISTORICAL
AIR887B
This SAE Aerospace Information Report (AIR) identifies and explains the meaning of various ratings and terms used to describe the physical characteristics of liquid filter elements. The significance of various filter parameters is discussed. In addition, a number of filter test methods is briefly described. This AIR and the data presented are only applicable to filters in which the system liquid wets the filter elements. This document includes equivalent metric units (in parentheses) as referenced information.
Standard

LIQUID FILTER RATINGS, PARAMETERS AND TESTS

2011-08-10
HISTORICAL
AIR887A
This AIR identifies and explains the meaning of various ratings and terms used to describe the physical characteristics of liquid filter elements. The significance of various filter parameters are discussed. In addition, a number of filter test methods are briefly described. This AIR and the data presented are only applicable to filters in which the system liquid wets the filter elements.
Standard

LIQUID FILTER RATINGS

1968-05-31
HISTORICAL
AIR887
This AIR explains the meaning of "ABSOLUTE" and "NOMINAL" ratings which are used to describe liquid filter element physical characteristics. A set of standard filter ratings and methods of determination to further describe an element performance are also included. These data are only applicable to a system in which the system liquid wets the filter element.
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