Matter of interest when do you jump the plank switch etc during the test ? The way we do it down here ( in the Caribbean ) the inspector likes to trip the governor ( then short any governor jaw switches or os switches ) then drive it until the plank switch breaks , only at that point do we jump the plank switch , and drive it a little further until it breaks traction or the drive quits .
I've not had one not break traction yet ...thank god , can imagine that's a ' oh s**T moment right there.!