Ever see the guys on the aircraft carrier ground the hovering hellicopter before touching it? The helo static shock (especially in inclimit weather) can knock them down if they don't first.
One of the airplanes I used to fly was a twin Cessna. In continuous moderate rain it would glow green at the base of the windshield. If you put your hand on the dash within about 6" of the base it would zap you. It would build then discharge at the dash. We had static discharge wicks on the airplane. It would be interesting to see how bad it would have been without them.
The composite aiplanes are the worst. The metal can can conduct the electricity giving it an avinew for discharge. The composite airplanes have to have a wire mesh in them if they are to be flown in inclimate weather. If not the discharges can damage everything from electronics to body pannels.
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