本文件已被宣布为“非现行”。因此，建议本文件不适用于新设计。“非现行”指的是那些以前被广泛引用的文件，并且在一些现有设计中可能会继续需要这些文件。本航空标准规定了主要用于往复式发动机驱动民用运输机的皮托静态型最大允许空速仪表的基本最低安全要求，其运行可能会使仪表受到第3段中规定的环境条件的影响。 3.本航空标准涵盖了最大允许空速仪表的基本类型，这些仪表连续指示指示的空速和不超过650节的最大允许空速。

This document has been declared “NONCURRENT”. It is recommended, therefore, that this document not be specified for new designs. “NONCURRENT” refers to those documents which have previously been widely referenced and may continue to be required on some existing designs.This Aeronautical Standard establishes the essential minimum safe requirements for pitot-static type of Maximum Allowable Airspeed Instruments primarily for use in reciprocating engine powered civil transport aircraft, the operation of which may subject the instruments to the instruments to the environmental conditions specified in paragraph 3.3. This Aeronautical Standard covers the basic types of maximum allowable airspeed instruments which give a continuous indication of both indicated air speed and maximum allowable airspeed not exceeding 650 knots.