该编码系统旨在提供一种方便的方法，用于识别不用于飞机的各种管道、管道、液压软管类型和软管配件，并在图纸或其他图片媒体不易获得的地方传输与其相关的技术或工程信息。该规范一直保持灵活性，允许扩展到涵盖新的配件类别或样式，如果需要，还可以包括其他材料。该系统还与自动数据处理设备兼容。 本规范无意取代既定的识别系统或方法。因此，应用最能满足用户要求的代码应该是用户的特权。

This coding system is intended to provide a convenient means of identifying the various tube, pipe, hydraulic hose type, and hose fittings not intended for use in aircraft and of transmitting technical or engineering information relating to them wherever drawings or other pictorial media may not be readily available. The code has been kept flexible to permit expansion to cover new fitting categories or styles and, if the need develops, the inclusion of additional materials. The system is also compatible with automatic data processing equipment. It is not intended that this code should supersede established systems or means of identification. Therefore, it should be the prerogative of the user to apply the code which best satisfies his requirements.