@Popo Jijo, If I'm following your signature correctly it goes: UGA, Miami Dolphins.... Mazda?
I can't give you any hard data on decibles, but anecdotally with a helmet and ear plugs, the noise level is very manageable and doesn't make me uncomfortable. I wear foamies under my helmet instead of CEPs. With the foamies it's quiet enough and they don't impede me from hearing the radios or any of the litany of tones/voices the jet has. Someone else may be able to give you a number but double hearing protection is a must.
The engines aren't as loud as you may think, all the sound is behind you. I feel like the air moving over the cockpit and the wings is louder than the motors.
However, after spending 1500 hours in a helo...I can't hear shit anyway. It's definitely not that loud.
The Army has taken a novel approach to hearing loss.... They arent qualifying it as disability anymore. Boeing has also published a paper saying that our hearing protection in the 64 is inadiquate due to the frequency of the sound not just the dB level. The back seaters head is 5 feet from a Transmission, 2 engines, and 2 nose gear boxes that make a whole lot of high pitch racket. Ive had to take my helmet off a few times in flight for issues.... dont ever want to do that again.
These are out of the Army Aero Medical Manual.
View attachment 14242 View attachment 14243
Yeah, look at those H-60 numbers!