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Lieutenant General
It's kind of Funny, at this initial production stage, J20 still doing high attitude testing.
That should be done during design and experimental stage.
If they found high attitude issue , is that means the program going to dial back and the production would be stopped.
It makes No Sense At All for what they doing.
To us observers but not to CAC and the PLAAF. Who knows what equipment or avionics they are testing on the J-20.