Overview
EN ISO 14509-1:2018 (identical to ISO 14509-1:2008, adopted by CEN) defines standardized pass-by measurement procedures for airborne sound emitted by powered recreational craft. The standard applies to craft up to 24 m hull length, including inboards, stern drives, outboard motors and personal watercraft (PWC). It specifies how to obtain reproducible and comparable values for the maximum A-weighted sound pressure level (LpASmax) during a craft passage and provides an optional procedure to determine sound exposure level (LE,A,T). The acoustical test procedures are classified as engineering grade (grade 2).
Key Topics and Technical Requirements
- Scope and applicability: Powered recreational craft up to 24 m, plus specific type tests for stern drives with integral exhaust systems and for outboard motors using a standard craft.
- Measurement quantities: Maximum A-weighted sound pressure level with slow time weighting (LpASmax) and optional A-weighted sound exposure level (LE,A,T).
- Equipment and calibration: References to internationally recognized instrumentation standards (e.g., IEC 61672-1 sound level meters, IEC 60942 calibrators).
- Test site and environmental controls: Requirements for test course layout, acceptable environmental conditions, and background noise corrections to ensure comparability.
- Microphone positions and measurement distance: Defined microphone placement and geometry for pass-by testing to ensure repeatable measurements.
- Operating conditions and test procedure: Specified engine/load conditions, run sequences, and procedures for type tests and monitoring tests.
- Measurement uncertainty and reproducibility: Engineering-grade accuracy with stated reproducibility limits and methods to estimate uncertainty.
- Reporting: Mandatory test report elements and standard craft specifications for type testing.
Applications and Who Uses It
EN ISO 14509-1:2018 is used by:
- Boat and outboard motor manufacturers for type testing and design validation of noise emissions.
- Acoustic test laboratories conducting pass-by noise measurements and certification testing.
- Regulatory bodies and certification authorities verifying compliance with noise emission requirements (aligned with EU Directive 2013/53/EU for noise).
- Naval architects and propulsion system designers optimizing noise performance.
- Environmental and acoustic consultants performing monitoring tests and impact assessments.
Practical uses include product certification, production monitoring, regulatory compliance checks, and design evaluation to reduce airborne noise from recreational craft.
Related Standards
Keywords: EN ISO 14509-1:2018, ISO 14509-1:2008, small craft noise, pass-by measurement procedures, airborne sound, recreational craft, outboard motor noise, stern drive noise, sound exposure level.