本SAE航空航天标准（AS）涵盖用于远程指示发动机转速的转速表仪表（转速指示器、0-110%转速和0-120%转速指示器以及发电机）。本航空航天标准确立了转速表仪器的基本最低安全性能标准，主要用于涡轮驱动的亚音速运输机，其运行可能会使仪器处于第3.3节规定的环境条件下。

This SAE Aerospace Standard (AS) covers tachometer instruments (RPM indicator, 0-110 percent RPM and 0-120 percent RPM indicators and generator) for remote indication of engine speed.This Aerospace Standard establishes the essential minimum safe performance standards for Tachometer Instruments primarily for use on turbine-powered subsonic transport aircraft, the operation of which may subject the instruments to the environmental conditions specified in Section 3.3.