AC 43.13-1 5-28


a. Demagnetization. Demagnetize between

successive magnetization of the same

part, to allow finding defects in all directions,

and whenever the residual magnetism interferes

with the interpretation of the indications.

Also, demagnetize all parts and materials after

completion of magnetic particle examination.

Test all parts at several locations and parts for

residual magnetism of complex configuration

at all significant changes in geometry. Repeat

demagnetization if there is any appreciable deflection

of the field indicator needle.

(1) AC method. Hold the part in the

AC demagnetizing coils and then move the

part slowly and steadily through the coils and

approximately 3 to 4 feet past the coils. Repeat

this process until the part loses its residual

magnetism. Rotate and tumble parts of complex

configuration as they are passed through

the coils.

(2) DC method. Place the part in the

same relative position as when magnetized and

apply reversing DC current. Gradually reduce

the current to zero and repeat the process until

the residual magnetic field is depleted.





You can make a loop of heavy insulated wire

"john smith" wrote in message
...
| Degaussing an airframe is not quite the same as degaussing
a magnetic
| tape or CRT.
| I have "heard" of people doing it with a 110VAC line and a
100W light
| bulb for a load.