Originally Posted by
Hot and Hi
ANR headsets often don’t work at all with ‘doors open’. I think this is what the OP describes with “copilot window open” etc. The ANR system gets confused by the wind buffeting, and creates an unbearable artefact
noise. I personally had this with the Bose A20. I would assume that this is lesser of a problem when the ANR headset speakers are embedded in a helmet, but can’t speak from experience here.
This is exactly what I experienced with both the Bose A20 and the Zulu 2 in the 412 but not in a 206 or 407 with windows open and air scoops fitted.