Whistle test?

It means that as you work with any of your systems, someone could randomly blow a whistle and at that instant you have to let go of whatever is in your hands and put your body weight into the system. If you stay put, you pass the test, and if you plummet, you fail the test.
 
Picture and old assembly line factory or foundry when the shift ending steam whistle blows and all the workers clear out in seconds, dropping everything.
Alternatively- look Ma no hands!
 

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