What is the decibel level of noise that requires hearing protection in the cockpit?

The decibel level requiring hearing protection in the cockpit is set at 85 dB or greater. This standard is based on research that indicates prolonged exposure to noise levels at or above this threshold can lead to hearing loss. The regulation emphasizes the importance of protecting hearing since many pilots and crew members may spend extended periods of time in environments where noise can accumulate, potentially surpassing this critical level.

The choice of 85 dB aligns with occupational safety guidelines that suggest implementing hearing conservation programs when noise exposure exceeds this limit, ensuring that individuals are equipped with the necessary protective measures to safeguard their auditory health. This threshold marks a proactive approach to hearing conservation in aviation, where noise levels can often be overlooked amidst other operational considerations.