In responding to the anonymous poster's load test anxiety, I let the
facts run away from me.

Here is the test question:
You have supported a 1000 lb airplane upside down, and wish to apply a
4g load test.
How much weight do you add to the wings etc.?

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Hands up, all who said 3000 lb.
Correct!
The airframe is already
supporting its own (1g) weight. :-)

Brian W