Diego84

Hi Mark thanks for all your helpful info about it, how "easy" could be to buy, adapt, and install these system in an aircraft?, the part number or how to find that  specific part is not clear.
I'm flying the 767, and I am also a mechanical engineer with some experience in maintenance, not in my actual company and neither certified, because it was in the Colombian Air Force 10 years ago.
I understand that there is a lot of paper work needed before making a modification to an airplane, but there are some few 767 of the fleet which was converted from PAX to Cargo, and after that conversion they became too noisy even afecting now the communications into the cockpit, especially on high power settings such as takeoff and approach, which are the most safety sensitive ones, but we as crew want to search for better solution, because we already tried to write it on the maintenance logbook, but the answer was that noise is just normal, but it is not, so now we are trying to find best solutions to this issue. 

Thanks in advance for your cooperation

Diego  C
767 Flight Crew