SN/T 1431.2-2004 进出口低压电器检验规程 家用和类似场所用过电流保护断路器

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【英文标准名称】:Aircraftgroundsupportequipment-Specificrequirements-Part20:electricalgroundpowerunits.
【原文标准名称】:航空器地勤支持设备.具体要求.第20部分:电气接地供电设备
【标准号】:NFL91-002-20-2010
【标准状态】:现行
【国别】:法国
【发布日期】:2010-06-01
【实施或试行日期】:2010-06-05
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:航空工程;航空设备;航空航天运输;航空运输;航空器地面支持设备;控制;控制设备;挤压(事故);定义;地面站;电缆;电能;电插头;电力系统;供能系统(建筑物);一般条件;地面设备;危害;机械卷边连接;安全;安全措施;安全要求;航天运输;规范(验收);指示器;用户信息
【英文主题词】:Aeronauticalengineering;Aeronauticalequipment;Aerospacetransport;Airtransport;Aircraftgroundsupportequipments;Control;Controlequipment;Crushing(accident);Definitions;Earthstations;Electriccables;Electricenergy;Electricplugs;Electricpowersystems;Energysupplysystems(buildings);Generalconditions;Groundequipment;Hazards;Mechanicalcrimping;Safety;Safetymeasures;Safetyrequirements;Spacetransport;Specification(approval);Telltales;Userinformation
【摘要】:
【中国标准分类号】:V56
【国际标准分类号】:49_100
【页数】:33P;A4
【正文语种】:其他


Product Code:SAE J1787
Title:Measurement of the Total Ash Content of Aviation Piston Engine Oils by a Calculation Method
Issuing Committee:E-38, Aviation Piston Engine Fuels And Lubricants
Scope:This SAE Recommended Practice describes an empirical method for determining the theoretical ash content of aviation piston engine lubricating oils by calculating the equivalent weight of metallic oxides formed at 775 掳C based on the metallic elemental concentration.The calculation method of ash determination may be used as an alternate to ASTM D 482 for application to the standards for aviation piston engine lubricating oils.Field of ApplicationThis procedure is recommended for use in the qualification, manufacturing, and quality assurance testing of aviation piston engine lubricating oils where the ash content is limited to a maximum of 0.011%.BackgroundThe ash content as measured by ASTM D 482 has very poor precision and repeatability for lubricants having low ash content. The precision statement for the method states that the reproducibility of a sample in the range of 0.001 to 0.079% ash content is 0.005%. Further, the bias of the test cannot be determined and there is no standard reference material containing a known level of ash for this method. This poor precision has led to numerous problems concerning the actual ash content of products on many occasions. The test method is valuable when run by experienced operators, but can provide dubious information if run under the general conditions stated in the method. For example, to obtain repeatable results, a platinum crucible must always be used in place of the silica or porcelain crucibles listed as equivalent substitutes. Meticulous care and procedural knowledge must be used by experienced operators for the method to be productive.The notes provided in ASTM D 482 also suggest that this method may not be appropriate for oils containing ashless additives or for oils containing certain phosphorous compounds which may now be in use in aviation lubricants. For oils containing additives an alternate method, ASTM D 874, is suggested. However, ASTM D 874 includes additional restrictions and reservattions which question the suitability of that method as an acceptable alternate or replacement for ASTM D 482 for low ash containing lubricating oils.