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Real world attenuation of foam earplugs- smith

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  • 1.RAAF Institute of Aviation Medicine Real-world attenuation of foam earplugs. Dr Adrian Smith RAAF Institute of Aviation Medicine

2. RAAF Institute of Aviation Medicine Noise-induced hearing loss Common occupational hazard Across industries Global Costs Australia, 24% of OH&S claims in last 10 yrs $$: compensation $$: lost productivity In Australia, $11 billion each year 3. RAAF Institute of Aviation Medicine 4. RAAF Institute of Aviation Medicine 5. RAAF Institute of Aviation Medicine 6. Measured noise Factory attenuation data Calculated at-ear noise exposure 7. Roll earplug into a crease-free cylinder. Pull Back ear by reaching over head with free hand, gently pull top of ear up and out. Insert earplug deep into ear canal. Hold until it fully expands. Visual check. The earplug should not be visible from the front. Acoustic check. Earplugs should block enough noise that covering your ears does not result in a significant difference. 8. But Most earplug users do not receive formal training to insert earplugs. Start of training. These are earplugs. t them in your ear when you are around loud noise. End of training. 9. This is how deep to insert earplugs! 10. Aim Document real-world attenuation of foam earplugs. Determine whether training improves attenuation. 11. Method 43 aircrew, attending AVMED for training Asked to insert earplugs as normal. Blinded to purpose of the study Not coached or corrected Technique recorded Attenuation measured One-on-one training, plus 10-sec video clips 12. Demographics Aircrew Pilots, 24 (56%) Non-pilots, 19 (44%) Experience Junior (1-100 hr), 53% Experienced (101-1500 hr), 28% Very experienced (>1500 hr), 19% 13. ANSI S12.6-1997 Earplugs inserted under direct vision of a trained audiologist. Earplugs inserted by nave wearers, following manufacturers instructions. AS1270:2002 Optimum protection Typical protection of an informed user 14. I S12.6-1997 Optimum performance, inserted under direct control of trained audiologist. NRR 32 dB 270:2002 Typical performance achievable by 80% of informed users. SLC80 25 dB s study. Performance of typical population of users. SLC801 18 dB 15. What about those with formal training? 16. * 17. After training 18. Importance of technique 19. ** * * p

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