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It is a regulation, that when one pilot leaves the cockpit, then the remaining pilot has to donn the mask and breath from it.
originally posted by: Talliostro
Well thanks Zaphod for the info, that at least answers my question why this investigation seems to be different. France has other procedures and protocols in place when investigating plane crashes than other countries.
And I do wonder about the mention of the Oxygen-Mask too. Why would anyone put that thing on, when there is no emergency in the cockpit?