规定了方案的模具要求，以通过适当的标记指示飞机和航天器系统中刚性管组件的功能或内容，但不包括航空发动机中的刚性管组件，但在其断点处直接连接到机身系统的刚性管组件除外。如果需要，这些要求也适用于软管组件。该方案的目的是提供正常维护所需的最低标识。

Lays down die requirements for a scheme to indicate, by appropriate marking, the functions or contents of rigid pipe assemblies in aircraft and spacecraft systems, but excluding those in aero-engines with the exception of those which connect directly to the airframe systems at their break points. These requirements may also be applied to hose assemblies, if desired. The purpose of the scheme is to provide the minimum identification necessary for normal maintenance purposes.