Tips to Ground an Aircraft While Refueling
Lately, I have received a number of questions concerning grounding or bonding an aircraft during the refueling process.
The reason for using a bonding strap during refueling is that when an electrically, non-conductive fluid like Jet A or 100LL is transferred, these liquids build up static electricity that can arc and cause a fire if not dissipated.
This is like how your body can build up static electricity when you walk across a carpeted floor and then arc when you touch a grounded item.
In the past, we called it grounding and we connected a jumper cable from a ground post to the plane and to the refueler.
But the airlines found that having a ground cable connected to a large airplane in a storm can lead to "electrical" and other problems.
Read the full article here.