Originally Posted by
encore
Maybe they depressurized the airplane as part of a smoke removal procedure.
Our smoke evac check list procedure says set cabin alt to 10,000 ft. No masks needed for that.
I'm not trying to be critical of the pilot. I just try to learn something every day. I want to do it right if it happens to me. If Boeing or Airbus thought it was a good idea they would put it in the procedure.