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On the SOFIA aircraft, the aircraft is designed to fly at very high altitudes (higher than what can be achieved by regular 747), with a cargo door open.
https://upload.wikimedia.org/wikipedia/commons/8/8a/SOFIA_ED10-0182-01_full.jpg
I know that oxygen mask are a standard feature for most airliners but:
How is the aircraft designed to handle this situation ?
What about redundancy ?
If there is supplemental oxygen, is it really without adverse effects ?
pic credits wikimedia
From the picture I can see a bulk head forward of the telescope area. This modified 747SP might have a re-positioned bulk head then. Anything forward of the telescope would be pressurized.
This source confirms, bulk head was moved from the aft to be ahead of the telescope.
