本文件已被宣布“稳定”，不再接受货币定期审查。用户负责验证参考文件和持续适用性或技术要求。可能存在新技术。本航空航天信息报告（AIR）描述了计算机场附近喷气式和螺旋桨驱动飞机运行产生的地面位置声暴露水平的程序。这些程序假设每架涉及的飞机都有参考噪声和性能数据。程序的基本要素是计算任何特定飞机在执行任何指定操作时平均产生的a加权声暴露水平（SEL）的方法。 给出了计算单个飞机运行的声暴露级和一系列不同飞机运行累积效应产生的平均声级的程序，通常表示为在适当的长时间段内平均的昼夜平均声级（DNL）。使用本手册中推荐的程序计算等平均声级轮廓的主要目的是协助机场周围的土地利用规划。等声级的轮廓可以通过连接线穿过恒定声级的各个点来构建。虽然该AIR的程序描述了机场附近任何点的声级计算，但等高线的计算程序是计算机- 取决于程序，不属于此AIR的一部分。

This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist.This Aerospace Information Report (AIR) describes procedures for calculating sound exposure levels at ground locations resulting from operations of jet and propeller driven airplanes in the vicinity of an airport. The procedures assume that reference noise and performance data are available for each airplane involved. The fundamental element of the procedures is a method for calculating the A-weighted sound exposure level (SEL) that would be produced, on average, by any specific airplane when performing any specified operation. Procedures are given for calculating sound exposure levels for individual airplane operations and for the average sound level produced by the cumulative effect of a series of different airplane operations, normally expressed in terms of day-night average sound level (DNL) averaged over an appropriate long time period. The principal purpose of using the procedures recommended in this AIR to calculate contours of equal average sound levels is to assist in land-use planning around airports. Contours of equal sound level may be constructed by connecting lines through individual points of constant sound level. While the procedures of this AIR describes the computation of sound levels at any point in the vicinity of an airport, the procedure for calculation of contours is computer-program dependent and is not a part of this AIR.