Ground hopping refers to running a power pack prior to installing it. In other words, while it is still sitting on the ground. It is a great way to identify leaks, etc prior to fully installing. It is very common with tracked/armor vehicles. Any time we pulled a pack from one of our howitzers, we would ground hop it prior to reinstalling.
I personally ground hop or run any engine prior to installing it in a vehicle. So much simpler to fix problems while still outside the vehicle, especially if repair requires removal.
Jim Rice
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