I was just wondering if at all there was any legal regulatory requirement(s) to be met before a flight deck crew oxygen mask was approved for use in the cockpit. Such as maybe the time taken to don, the 'sealing off' capability etc etc.
I do know of some older jet airplanes that had a maximum time to don requirement of 5 seconds. Wonder if this is still true for the newer airplanes say the 777/380's.
Also wondering if this requirement would differ from airplane to airplane even though the mask manufacturer remains the same.
Feel free to chip in. I'm on the wrong side of the fence this time....
