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Standard

A Methodology for Assessing Inlet Swirl Distortion
2022-03-07
CURRENT
AIR5686
This Aerospace Information Report (AIR) addresses the subject of aircraft inlet-swirl distortion. A structured methodology for characterizing steady-state swirl distortion in terms of swirl descriptors and for correlating the swirl descriptors with loss in stability pressure ratio is presented. The methodology is to be considered in conjunction with other SAE inlet distortion methodologies. In particular, the combined effects of swirl and total-pressure distortion on stability margin are considered. However, dynamic swirl, i.e., time-variant swirl, is not considered. The implementation of the swirl assessment methodology is shown through both computational and experimental examples. Different types of swirl distortion encountered in various engine installations and operations are described, and case studies which highlight the impact of swirl on engine stability are provided. Supplemental material is included in the appendices.
Standard

A Review of Literature on the Relationship Between Gas Turbine Engine Lubricants and Aircraft Cabin Air Quality
2016-09-12
CURRENT
AIR5784
There has been a recent upsurge in interest from the media concerning the quality of the environment within aircraft cabins and cockpits especially in the commercial world1-4. This has included (although by no means been limited to) the air quality, with particular reference to the alleged effects of contamination from the aircraft turbine lubricant. Possible exposure to ‘organophosphates’ (OPs) from the oil has raised special concerns from cabin crew. Such is the concern that government organisations around the world, including Australia, USA and UK, have set up committees to investigate the cabin air quality issue. Concern was also voiced in the aviation lubricants world at the way in which OP additives in turbine lubricants were being blamed in some reports for the symptoms being experienced by air crew and passengers. SAE Committee E-34 therefore decided that it should gather as much available information on the subject as possible.
Standard

A Review of Literature on the Relationship Between Gas Turbine Engine Lubricants and Aircraft Cabin Air Quality
2021-03-25
WIP
AIR5784A
There has been a recent upsurge in interest from the media concerning the quality of the environment within aircraft cabins and cockpits especially in the commercial world. This has included (although by no means been limited to) the air quality, with particular reference to the alleged effects of contamination from the aircraft turbine lubricant. Possible exposure to 'organophosphates' (OPs) from the oil has raised special concerns from cabin crew. Such is the concern that government organisations around the world, including Australia, USA and UK, have set up committees to investigate the cabin air quality issue. Concern was also voiced in the aviation lubricants world at the way in which OP additives in turbine lubricants were being blamed in some reports for the symptoms being experienced by air crew and passengers. SAE Committee E-34 therefore decided that it should gather as much available information on the subject as possible.
Standard

ACOUSTIC EMISSION TEST METHODS
1991-03-01
HISTORICAL
J1242_199103
The scope of this SAE Information Report is to supply the user with sufficient information so that he may decide whether acoustic emission test methods apply to his particular inspection problem. Detailed technical information can be obtained by referring to Section 2.
Standard

AEROSPACE - DYNAMIC TEST METHOD FOR DETERMINING THE RELATIVE DEGREE OF CLEANLINESS OF THE DOWNSTREAM SIDE OF FILTER ELEMENTS
1996-05-01
HISTORICAL
ARP599B
This SAE Aerospace Recommended Practice (ARP) describes a procedure for determining the insoluble contamination level of the downstream side of filter elements. Results of this procedure represent the particulate released from the tested filter element under the prevailing conditions of the test. The results may be used for comparative evaluation of the effectiveness of various cleaning methods or the cleanliness of elements after cleaning or as received from manufacturers.
Standard

AEROSPACE - HYDRAULIC SYSTEM FLUID CONTAMINATION - LOCATION OF SAMPLING POINTS
1989-10-01
HISTORICAL
ARP4268
The scope of this Aerospace Recommended Practice (ARP) covers where, when, and how often to sample hydraulic system fluid on aerospace vehicles for particulate contamination measurements. The measurement of hydraulic fluid particulate contamination is of concern to the aerospace community because of the critical importance of hydraulic equipment reliability. Contamination is always present in the system fluid, even in new unused fluid. Contamination must be below a level that will not adversely affect system operation. This ARP draws from aerospace industry experience and practice to establish criteria for fluid contamination sampling recommendations in aerospace vehicle hydraulic systems. Fluid samples can then be subjected to measurement of particulate contamination and of other harmful contaminants such as chlorinated solvents and water.
Standard

AEROSPACE INFORMATION REPORT FOR CONTINUOUS FLOW OXYGEN HOSE DISCONNECT FITTINGS
1991-09-01
HISTORICAL
AIR1358
This AIR indicates those dimensions, deemed critical by the manufacturer, which are required to be adhered to so that proper mating of the disconnect hose fitting with the correct disconnect be accomplished. The dimensions are critical, but not necessarily complete, in defining these fittings since there are other criteria which must also be met.
Standard

AEROSPACE-CLEANLINESS CLASSIFICATION FOR HYDRAULIC FLUIDS
1990-03-30
HISTORICAL
AS4059A
This SAE Aerospace Standard 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

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

AEROSPACE-CLEANLINESS CLASSIFICATION FOR HYDRAULIC FLUIDS
1988-06-14
HISTORICAL
AS4059
This SAE Aerospace Standard 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

AEROSPACE-PARTICLE COUNT DATA CONVERSION AND EXTRAPOLATION
1993-03-02
HISTORICAL
AIR877A
This Aerospace Information Report (AIR) describes a mathematical model that can be used to analyze particle count data. Particle counts that 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

AIR CONDITIONING, HELICOPTER, GENERAL REQUIREMENTS FOR
1970-10-26
HISTORICAL
ARP292B
These recommendations are written to cover the general requirements of helicopter air conditioning and are sub-divided as follows: (1) Air Conditioning System - Dealing with the general design aspects. (2) Air Conditioning Equipment - Design requirements for satisfactory system function and performance. (3) Air Conditioning System Design Requirements -General information for use of those concerned in meeting requirements contained herein.
Standard

AIRCRAFT GAS TURBINE ENGINE EXHAUST SMOKE MEASUREMENT
1970-05-01
HISTORICAL
ARP1179
The purpose of this Aerospace Recommended Practice is to standardize test equipment and procedures for the measurement of smoke emission from aircraft gas turbine engines. The procedures included are for determining and reporting the amount of smoke emission. This document is divided into the following sections: 1 Definitions and Terminology 2 Equipment 3 Test Procedures 4 Information and Data to be Recorded 5 Data Reduction and Analysis 6 Presentation of Results
Standard

AIRCRAFT GAS TURBINE ENGINE EXHAUST SMOKE MEASUREMENT
1970-05-04
HISTORICAL
ARP1179A
This Aerospace Recommended Practice (ARP) standardizes test equipment and procedures for the measurement of smoke emission from aircraft gas turbine engines. The procedures included are for determining and reporting the amount of smoke emission. Tests have indicated that the practically achieveable precision of the smoke number is within ±3 when the system is properly used as outlined herein. This procedure is not intended for in-flight testing, nor does it apply to afterburning engines. This ARP is divided into the following sections: 2 Definitions and Terminology 3 Equipment 4 Test Procedures 5 Information and Data to be Recorded 6 Data Reduction and Analysis 7 Presentation of Results 8 Comments
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