Boeing never said the door blew off. Please provide the quote where Boeing said the door flew off.
But that is the issue, many media sources had done the right thing and contacted Boeing for comment/statement regarding the matter, and a Boeing given the opportunity neither confirmed or denied a door blew off. They just gave a lame statement saying something happened which interrupted testing, which gives the impression testing will resume.
Can I also help people understand when a significant failure like this happens after the explosive depressurization of the lower deck, it can result in a failure of other components as the floor is not designed to carry a 10 psi load from a pressurized upper deck and depressurization in the lower deck. One the side of the cabin wall there should be vents to allow air to move from the upper deck to the lower deck without failing the floor.
This is not an interruption of testing, the significant failure is the end of that static airframe. The only way to resume the same testing would be to start again with another static frame which will not happen, and would not be necessary.
Boeing could simply decide not to change any of the structure and just reduce the maximum cabin diff a little and/or maximum cruise altitude, it would only mean a small increase the cabin altitude. By far the simplest way to move forward.
The 777 currently has a maximum altitude of 43100 ft, which is a pressure of 2.34 psi in a standard atmosphere, if it maintains a 8000 ft (10.92 psi is the pressure at 8000 ft in a standard atmosphere) cabin at that altitude, the maximum pressure diff is 10.92-2.34=8.58 psi. The maximum diff if the pressure difference on the surface of the pressure vessel, the pressure difference between 41300 ft and 8000 ft.
150% of 8.58 psi is 12.87, this test failed at 10 psi according to the media reports.
With the 777X they wanted to maintain a maximum cabin of 6000 ft (11.78 psi is the pressure at 6000 ft in a standard atmosphere). So the maximum diff required is 11.78-2.34 =9.44 psi, which is very close to the failure level reported of 10 psi, only around a 6% safety margin.
So in my view the Boeing statement was deliberately misleading. They had been given the opportunity a number of times to get ahead of this, instead have downplayed this to a level which I think is which is generous to call it misleading.
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