Originally Posted by
All Bizniz
Is there really a risk of suffering hearing damage for pilots who don't keep headsets on while flying the Bus, or Guppy?
https://www.gao.gov/assets/690/689099.pdf
Pretty neat chart on page 13, however most of the readings were from the cabins and not cockpits. I believe the old rule of thumb was that if you had to raise your voice to converse then you should be wearing hearing protection.