Originally Posted by
FlyerJosh
The Citation is the loudest jet cockpit that I've been in so far. (Louder than the CRJ or ERJ or 737 based on my experiences). The sound noise at FL400 is about the equivalent of the CRJ at 10000' and 300 KIAS, due to the big bleed air ducts that provide windshield deice/anti-ice.
you need to get into one of the standup citations, (650,excell,ect) much quieter.