本文件已被宣布为“稳定”，不再接受货币定期审查。用户负责验证参考资料和持续适用性或技术要求。新技术可能存在。民用或军用旋翼机相对较小空间内的内部噪声来自外部和内部噪声源。可能需要进行车内噪声测量，以制定或评估声学处理设计，从而为乘员和乘客提供必要的舒适度。本文件描述了统一测量、分析和报告旋翼机内部声压级的推荐方法和程序。 由于旋翼机在显著不同的飞行条件下运行，因此，在人员占用的旋翼机机舱内进行满意的噪声测量可能需要不同于其他类型飞机（ARP1323）规定的测试技术。本ArP的建议适用于磁带上声学数据的记录以及记录数据的后续处理和分析。

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.The interior noise within the relatively small space of civilian or military rotorcraft results from exterior and interior noise sources. Interior noise measurements may be required in order to develop or evaluate acoustical treatment designs that will provide a necessary degree of crew and passenger comfort. This document describes recommended methods and procedures for uniform measurement, analysis and reporting of sound pressure levels in the interior of rotorcraft. Satisfactory measurements of noise in personnel-occupied rotorcraft cabins may require test techniques different from those prescribed for other types of aircraft (ARP1323) because rotorcraft operate under significantly different flight conditions. Recommendations of this ArP apply to the recording of acoustical data on magnetic tape and the subsequent processing and analysis of the recorded data.