SMM, current would be induced in the airframe which would cancel original wire B-field, thus shielding the heli electrical system. Since 60Hz wavelength is ~500km (assuming electricity v=~0.1c), induced current is limited to neutralising B-field difference across airframe.
Induced currents are certainly a problem when welding steel frames, the requirement being to disconnect all electrical system components from harness. I imagine the MD500 riveted alumininium frame is closely inspected for arc damage from the charge currents though.
Mart
Last edited by Graviman; 28th Apr 2007 at 05:42.
Reason: Added bit about wavelength, and quick tidy up.