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If the deliberate clack of the trim wheel also goes into the headphones then why are we having a discussion about whether headphones stopped them hearing the deliberate clack of the trimwheel?

My guess is the electronic beeps and boops could be piped into the headsets, but the mechanical clack-clack of the trim wheel is not.

Noise cancelling headphones would still let you something clicking right in front of you. In fact, open-back noise cancelling headphones would be better to wear than something that just muffles the noise if you need to hear your environment but just want to cut out the hum of the engines.

I'd imagine that that would be less common (or at least, they would use headphones with a lesser effect) with commercial jets. They're far enough from the engines that the noise should be pretty tollerable.