I did a survey on the F100, coz that's what I fly, at the request of management.
Found that the ambient noise levels were in excess of those prescribed by legislation - Health and Safety At Work Act. Passed info to management as per request. Result - Zip, Zero, Nothing, Nought. It would cost money to provide crews with adequate ear protection.
The good news is, if I, or any of my colleagues, lose their hearing the management, having had the problem pointed out, are negligent if they don't take steps to correct the problem. Hugmonster over to you !