JF Coastal_imp said:
So it's preventative . Thanks for the explanation !!
Yep. It's most important if you spend a lot of time at highway speeds. Noise level can reach over 100 dB at 65 mph. Continued exposure to levels above 85 dB can cause hearing loss.
Way back when I first started flying virtually no one used noise reducing headsets in training aircraft (noise levels in the 110 dB range). Just about every long time flight instructor I know has some level of hearing loss. Nowadays most every trainer is equipped with headsets and intercom systems.