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Standard

A Current Assessment of Combining Distortion Types

2019-07-22
WIP
AIR9975
This document will address techniques or methods that have been used within the industry to address the problem of engine stability margin accounting when combinations of distortion types exist in an aircraft installation. Its focus is combining temperature, planar wave, and swirl distortion with time-variant spatial total pressure distortion. Example methodologies will be presented along with example cases where co-existing distortions have been evaluated. It will also address the areas where the industries' knowledge base is lacking (experimental data or computational methods) and the future work that is needed for methodology development in these areas. This document is viewed to be updated every five years as more information (data either experimentally or analytically) becomes available.
Standard

A GUIDE TO AIRCRAFT TURBINE ENGINE VIBRATION MONITORING SYSTEMS

1992-03-10
HISTORICAL
AIR1839A
This Aerospace Information Report (AIR) is a general overview of typical airborne vibration monitoring (AVM) systems with an emphasis on system hardware design considerations. It describes AVM systems currently in use. The purpose of this AIR is to provide information and guidance for the selection, installation, and use of AVM systems and their elements. This AIR is not intended as a legal document but only as a technical guide.
Standard

A Guide to Aircraft Turbine Engine Vibration Monitoring Systems

2001-07-01
HISTORICAL
AIR1839B
This SAE Aerospace Information Report (AIR) is a general overview of typical airborne engine vibration monitoring (EVM) systems with an emphasis on system design considerations. It describes EVM systems currently in use and future trends in EVM development.
Standard

A Guide to Aircraft Turbine Engine Vibration Monitoring Systems

2008-02-16
HISTORICAL
AIR1839C
This Aerospace Information Report (AIR) is a general overview of typical airborne engine vibration monitoring (EVM) systems applicable to fixed or rotary wing aircraft applications, with an emphasis on system design considerations. It describes EVM systems currently in use and future trends in EVM development. The broader scope of Health and Usage Monitoring Systems, (HUMS ) is covered in SAE documents AS5391, AS5392, AS5393, AS5394, AS5395, AIR4174.
Standard

A Guide to Aircraft Turbine Engine Vibration Monitoring Systems

2015-12-20
CURRENT
ARP1839
This Aerospace Recommended Practice (ARP) is a general overview of typical airborne engine vibration monitoring (EVM) systems applicable to fixed or rotary wing aircraft applications, with an emphasis on system design considerations. It describes EVM systems currently in use and future trends in EVM development. The broader scope of Health and Usage Monitoring Systems, (HUMS) is covered in SAE documents AS5391, AS5392, AS5393, AS5394, AS5395, AIR4174. This ARP also contains the essential elements of AS8054 which remain relevant and which have not been incorporated into Original Equipment Manufacturers (OEM) specifications.
Standard

A Guide to the Development of a Ground Station for Engine Condition Monitoring

2005-02-16
HISTORICAL
AIR4175A
An effective GSS is vital to the successful implementation of an EMS and is a fundamental part of the total monitoring system design, including asset management. Unlike the on-board part of the EMS which principally uses real time data to indicate when engine maintenance is required, a GSS can offer much greater processing power to comprehensively analyze and manipulate EMS data for both maintenance and logistics purposes. This document reviews the main EMS functions and discusses the operating requirements used to determine the basis design of a GSS, including the interfaces with other maintenance or logistic systems. A brief discussion is also included on some of the more recent advances in GSS technology that have been specifically developed to provide more effective diagnostic capabilities for gas turbine engines.
Standard

A Methodology for Assessing Inlet Swirl Distortion

2010-10-25
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 Power Usage Metric For Rotorcraft Power Train Transmissions

2014-09-30
WIP
AIR6334
This SAE Aerospace Information Report (AIR) examines the need for and the application of a power train usage metric that can be used to more accurately determine the TBO for helicopter transmissions. It provides a formula for the translation of the recorded torque history into mechanical usage. It provides examples of this process and recommends a way forward. This document of the SAE HM-1 IVHM Committee is not intended as a legal document and does not provide detailed implementation steps, but does address general implementation concerns and potential benefits.
Standard

A/C Compressor Oil Separator Effectiveness Test Standard

2019-07-15
CURRENT
J3112_201907
This SAE Standard establishes the test conditions and reporting method for quantifying refrigerant circuit oil circulation rate (OCR) reduction effectiveness of mobile air conditioning compressors using R-134a and R-1234yf refrigerants that include oil separators and/or other design features for the purpose of reducing the OCR in the refrigerant circuit. This standard and the OCR values it produces are not intended to make judgement on suitability of OCR values with regard to compressor durability.
Standard

A/C Compressor Oil Separator Effectiveness Test Standard

2017-03-07
HISTORICAL
J3112_201703
This SAE Standard establishes the test conditions and reporting method for quantifying refrigerant circuit oil circulation rate (OCR) reduction effectiveness of mobile air conditioning compressors using R-134a and R-1234yf refrigerants that include oil separators and/or other design features for the purpose of reducing the OCR in the refrigerant circuit.
Standard

ABRASIVE WEAR

1966-08-01
HISTORICAL
J965_196608
An enormous economic loss, as well as a waste of natural resources, is incurred world-wide as a result of wear of components and tools. Any effort expended in an attempt to reduce this loss is indeed worthwhile. The purpose of this SAE Information Report is to present the current state of knowledge of abrasive wear. This report, therefore, covers wear, or the undesired removal of metal by mechanical action, caused by abrasive particles in contact with the surface. It does not concern metal-to-metal wear or wear in the presence of an abrasive free lubricant. Abrasive wear occurs when hard particles, such as rocks, sand, or fragments of certain hard metals, slide or roll under pressure across a surface. This action tends to cut grooves across the metal surface, much like a cutting tool. Abrasive wear is of considerable importance in any part moving in relation to an abrasive.
Standard

ACOUSTICAL AND THERMAL MATERIALS TEST PROCEDURE

1989-10-01
HISTORICAL
J1324_198910
This SAE Recommended Practice provides test methods for determining the characteristics of acoustical and thermal materials. Where applicable, methods of test developed by SAE and ASTM have been referenced.
Standard

AEROSPACE FUEL SYSTEM SPECIFICATIONS AND STANDARDS

1976-03-01
HISTORICAL
AIR1408
This report lists military and industry specifications and standards which are commonly used in aerospace gas turbine fuel systems. It is intended as a supplement to specifications MIL-F-3863, MIL-F-17874 and MIL-F-8615. Revisions and amendments which are current for these specifications and standards are not listed.
Standard

AIR CONDITIONING OF SUBSONIC AIRCRAFT AT HIGH ALTITUDE

1984-03-01
CURRENT
AIR795A
This report is limited to the special problems of air quantity, purity, movement, pressure, temperature, and humidity which arise from the requirements of the human body during high altitude flight, together with the associated aircraft design problems.
Standard

AIRCRAFT ELECTRICAL HEATING SYSTEMS

1965-01-10
HISTORICAL
AIR860
It is intended that the scope of this information report be limited to electrical heating of passenger, crew, and cargo compartments only.
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