In parts of Zarya, astronauts could be subjected to a perceived noise level of 72.5 decibels ( dBA ).
2.
In parts of Zarya, astronauts could be subjected to a perceived noise level of 72 . 5 decibels ( dBA ).
3.
Installed on the King Air, the quiet propellers reduce the perceived noise levels enough to allow the airplanes to operate out of European airports with the most stringent noise requirements.