ISO 14509-1:2008
Small craft -- Airborne sound emitted by powered recreational craft -- Part 1: Pass-by measurement procedures
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It also specifies standard craft based type tests for stern drives with integral exhaust systems and for outboard motors. It also specifies the procedure to be followed if, in addition to the maximum sound pressure level, the determination of the sound exposure level is desired.
The accuracy grade of the acoustical test procedures specified in ISO 14509-1:2008 is engineering grade (grade 2).