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When working at height, safety is paramount—especially when using mobile elevating work platforms (MEWPs). For machines fitted with fibreglass booms, a specialised check known as an Acoustic Emission Test (AET) is required to ensure structural integrity and ongoing compliance.
What Is Acoustic Emission Testing?
Acoustic Emission Testing is a non-destructive testing method used to assess the condition of fibreglass-reinforced plastic (FRP) booms. These booms are commonly found on MEWPs used in electrical, industrial, and utility sectors due to their insulating properties.
The test involves applying and withdrawing a load over pre-determined cycles, while sensitive equipment monitors for acoustic signals—tiny stress-related sounds that can indicate cracks, fibre breaks, or delamination within the boom. These signals aren’t audible to the human ear but can reveal serious internal faults.
Meeting AS/NZS 4748 Requirements
In Aotearoa New Zealand, Acoustic Emission Testing must comply with AS/NZS 4748: Acoustic Emission Testing of Fibreglass Insulated Booms on Elevating Work Platforms. This joint Australian/New Zealand standard sets out the procedures, equipment specifications, and competency requirements for conducting the test correctly.
Testing to this standard ensures:
- The boom remains electrically insulated and structurally sound
- The platform is safe to operate in high-risk environments
- Your organisation meets legal and industry obligations
Why It’s Important
Over time, fibreglass booms are exposed to UV light, mechanical stress, and environmental wear. Even minor internal damage can lead to serious failure if not picked up early. Acoustic Emission Testing provides a proactive way to detect these issues before they become safety risks.
Who Should Carry It Out?
Only qualified and competent professionals with the right equipment and expertise should perform AET. The process requires precision, technical skill, and a thorough understanding of both the material and the standard.
In summary, Acoustic Emission Testing is a critical part of maintaining MEWP safety and compliance. If your equipment includes a fibreglass boom, make sure it’s tested regularly and in line with AS/NZS 4748—because when it comes to working at height, there’s no room for guesswork.
