Defines: a) the typical application for a permanently installed sound-monitoring system around an airport; b) performance specifications for instruments, and requirements for their unattended installation and operation, so as to determine continuously monitored sound pressure levels of aircraft sound at selected locations; c) requirements for monitoring the sound of aircraft operations from an airport; d) requirements for the quantities to be determined to describe the sound of aircraft operations; e) requirements for data to be reported and frequency of publication of reports; f) a procedure for determining the expanded uncertainty of the reported data in accordance with ISO/IEC Guide 98-3.