Originally Posted by
B727223Fan
I once observed a DC-9 being de- magnitized due to a lightening strike. The airplane was placed on jacks and a very large oval shaped coil mounted on a movable frame was moved over the fuselage several times from the nose to the wing leading edges. I did not get to observe the complete job and did not see how the aft fuselage was dealt with.
I can tell you from experience it is also very important to use Non- Magnetic Fasteners in areas where they are specified in Manuals and drawings.
If you think that was a big coil consider that the US navy demagnetizes entire ships.
Long time ago heard about a discussion of whether computer disk cartrides were safe inside a ship undergoing the process, consensus was they were but they did take backups on shore during the process.
No affect on the disks, think about all the steel surrounding them deep in the hull.