本AS涵盖了亚音速和超音速马赫数计仪器，当连接到静态（Ps）和总（Pt）或冲击（Pt Ps）源时，压力提供马赫数指示。这些仪器被称为A型。这也包括伺服操作的中继器或数字显示仪器，当连接到空气数据计算机的马赫数传感器的适当电气输出时，这些仪器指示马赫数。这些仪器被称为B型。本航空航天标准（as）规定了主要用于标准和环境条件下飞机的马赫数计仪器的最低安全性能标准。

This AS covers subsonic and supersonic Mach meter instruments which, when connected to sources of static (Ps), and total (Pt), or impact (Pt-Ps), pressure provide indication of Mach number. These instruments are known as Type A. This AS also covers servo-operated repeater or digital display instruments which indicate Mach number when connected to the appropriate electrical output of a Mach transducer of Air Data Computer. These instruments are known as Type B.This Aerospace Standard (AS) specifies the minimum safe performance standards for Mach Meter instruments primarily intended for use in aircraft under standard and environmental conditions.