SLF writes...
OK, I'm not a pilot, but it seems to me that if you are testing something, anything, on an aircraft or on anything else, it has to be a possibility that the thing you are testing will fail to perform as expected. Otherwise, what is the point of carrying out the test in the first place?
It would seem to my simplistic mind that testing the brakes on my freshly repaired car is best not done while approaching a brick wall at 80mph, and that testing the stall protection on an aeroplane is best not done very close to the ground.
Is that an overly simplistic viewpoint?