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Hal -
They make masks with mic's in them. Flew with them for many years; wearing them for hours. I'd personally have it very close and definitely plugged. A demand regulator would be best and that way you would have oxygen flow only when you breath in.
John Schroeder
I know that someone out there has a great idea for hiding the masks away,
but yet are totally accessible (especially for the pilot) in the event of a decompression.
Some additional questions:
Are the masks permanently plugged in?
Do you fly with the mask "at the ready" when at high altitude?
How would you communicate and breath O2 at the same time? (I've tried the headset mic up close to the mask - you can't break the squelch).
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