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。本ARP中建议的主要测量程序包括在稳态巡航条件下记录飞机内部的声压信号，并在飞行至倍频程（或三分之一倍频程）声压级后进行分析。或者，声压信号的频谱分析可以直接在飞机上进行。尽管与主要测量程序相比灵活性较低，但替代程序的优点是可立即获得频带或频率加权声压级，这些声压级与根据ISO 5129中的程序测量的声压级一致。 鉴于可能的测量范围，本ARP提供了从麦克风到读出设备的完整系统的电声性能要求。只要整个测量系统符合要求，就可以选择测量系统的各个部件。本ARP的建议并不旨在满足飞机设计或开发的严格要求。此外，在测量位置和测试程序可能存在特殊限制的情况下，它们可能不直接适用于直升机或通用航空飞机内部的声压级测量。给出了测量直升机内部声压级的具体建议。

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 primary measurement procedure recommended in this ARP includes the recording of sound pressure signals in the interior of an airplane during steady state cruise conditions with analysis after the flight into octave band (or one-third octave band) sound pressure levels. Alternatively, spectral analyses of the sound pressure signals may be performed directly on board an airplane. Though less flexible than the primary measurement procedure, the alternative procedure offers the advantage of immediate availability of frequency band or frequency weighted sound pressure levels that are consistent with those measured in accordance with the procedures in ISO 5129. In view of the range of possible measurement this ARP provides electroacoustical performance requirements for a complete system from a microphone to the readout device. Various individual components of a measurement system may be selected so long as the total measurement system complies with the requirements. Recommendations of this ARP are not intended to satisfy the stringent requirements for airplane design or development. Also, they may not be directly applicable to measurements of sound pressure levels in the interior of helicopters or general aviation airplanes where special constraints on measurement locations and test procedures may exist. Specific recommendations for measurement of interior sound pressure levels in helicopters are given.