PPRuNe Forums - View Single Post - Door blows out during ground test on Boeing 777X jet
Old 7th Sep 2019, 06:35
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FlightlessParrot
 
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Originally Posted by BayAreaLondoner
No but the way I read it, they seemed to be tying wing testing to destruction to the door blowing off. Or maybe it is just late and I should re-read it.
I think the piece confuses or combines stress testing and pressure testing, as in this passage:

" During the ultimate load test, the wings are then pulled upward. To pass the test and be certified, the wings must bend without breaking until the load on them reaches at least 150 percent of the normally expected load.

In addition, the skin panels that cover both the wings and the fuselage are pressurized to the maximum stress that would be expected at the edge of any extreme maneuver anticipated in service. The pressure is ratcheted up by pumping air into the cabin."
I don't think that however early you get up in the morning, that passage is going to make sense.
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