If crewmembers are exposed to 97 dB of noise, what is the maximum time they can be unprotected?

The correct answer is based on the Occupational Safety and Health Administration (OSHA) noise exposure regulations, which outline permissible noise exposure limits. At a noise level of 97 decibels (dB), the maximum allowable exposure time without hearing protection is significantly restricted because prolonged exposure can lead to hearing loss.

According to OSHA guidelines, the permissible exposure limit allows for an 8-hour workday at 90 dB. For every increase of 5 dB, the permissible exposure time is halved. Therefore, at 95 dB, the limit is 4 hours, and at 100 dB, it further reduces to 2 hours.

When evaluating exposure at 97 dB, you would interpolate between 95 dB and 100 dB. Given that 97 dB is halfway between these two values, the permissible time without protection is approximately 30 minutes. This duration reflects a balanced approach to protect crewmembers from the risk of immediate hearing damage while still permitting some exposure for operational necessities.

This understanding emphasizes the importance of monitoring noise levels and adhering to exposure limits to maintain the health and safety of crew members in high-noise environments.