本航空航天标准确立了主要用于往复式发动机驱动运输飞机的燃料、油和液压仪表的基本最低安全性能标准，其运行可能会使仪表受到第3.3节规定的环境条件的影响。本航空航天标准涵盖两种基本类型的燃料、油和液压仪表，如下所示:I型-直接指示，II型-远程指示。本航空航天标准不适用于安装在发动机上的扭矩计系统。

This Aerospace Standard establishes the essential minimum safe performance standards for fuel, oil and hydraulic pressure instruments primarily for use with reciprocating engine powered transport aircraft, the operation of which may subject the instruments to the environmental conditions specified in Section 3.3. This Aerospace Standard covers two basic types of fuel, oil and hydraulic pressure instruments as follows: Type I - Direct Indicating, Type II - Remote Indicating. This Aerospace Standard does not apply to engine mounted torque meter systems.