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Old 11th Jun 2023, 20:59
  #83 (permalink)  
RatherBeFlying
 
Join Date: Sep 2001
Location: Toronto
Posts: 2,561
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Time of useful consciousness at 28,000 (last reply to ATC at FL277) is about 3 minutes, which should be enough time to get on a mask. Less than 3 minutes later the pilot failed to respond to ATC. It's a coinflip between medical event or pressurisation failure.

Was the oxygen cylinder open? If not, was it in reach of the pilot? We will in due course hear from the NTSB.
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