本推荐规程规定了高性能控制电机转速表发电机的目标，该发电机将与航空和相关设备一起使用，安装在防护罩内或完全安装在飞机外壳内，从而使其仅受到热、冷、冲击、振动和湿度等内部气候条件的影响。本文件不包括尺寸大于23的控制电机转速计发电机。

This recommended practice establishes objectives for high performance control motor tachometer generators to be used with aeronautical and associated equipment in protective enclosures or completely within the shell of the aircraft so that they are subjected only to the internal climatic conditions of heat, cold, shock, vibration, and humidity. Control motor tachometer generators larger than size 23 are not covered in this document.