Electromagnetic Dent Removal - Cessna 510 Mustang Structural Repair Manual

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General

This procedure outlines the requirements and procedures for use of the Electromagnetic Dent Removal (EDR) process on

Cessna airplanes.

EDR may be used for removal and repair of dents on thin gauge sheet metal surfaces where access to both sides of the

damaged area is limited or inaccessible.

Qualification

Individuals or organizations performing Electromagnetic Dent Removal (EDR) on Cessna Airplanes, must be Cessna

approved/authorized service facilities, or the process must be performed by an approved EDR provider. Exceptions to

either of these criteria must be approved by Cessna Aircraft Company. Cessna approved providers of EDR are listed in

the qualified providers list.

Table 201. Qualified Providers List

Process Definition

EDR - The EDR process utilizes the principle of magnetic tension, which is generated by electromagnetic fields.

(1) The required electromagnetic fields are generated by capacitor discharge through a flux concentrator coil, which is

placed against the damaged area. This initial phase of the dent removal cycle is known as the "slow bank" action.

(2) A second capacitor discharge known as the "fast bank" action causes the instantaneous collapse of the magnetic

field on the front of the concave surface of the dent. With this field eliminated, the magnetic field on the rear or convex

surface pushes the metal to the face of the flux concentrator coil, removing the dent.

(3) The movement of metal stops upon striking the face of the flux concentrator coil reducing chance of "overpull".

Process Characteristics

Dents can be removed without rear surface access, eliminating the need for removal and replacement of airplane

components as required for conventional hand forming.

Bonded aluminum structures without rear surface access can be repaired by dent removal of the face sheet along with

straightening of the honeycomb core.

C. Completely portable repairs can be accomplished on the airplane.

D. The process is fast, repairs can be accomplished in minutes.

Avionics are not affected. (Refer to limitations paragraph.)

There are no residual magnetic fields in the repaired part.

G. The process can be used on fueled airplane in areas other than fuel cells.

The process can be used on painted surfaces.

The process leaves no "footprint" - subsequent blending is not required.

Limitations

Process Limitations:

(1) This process is not intended for removing dents in areas which contain protruding head fasteners, skin joints or other

protrusions, which prevent the flux concentrator coil from being in full contact with the metal surface surrounding the

dent.

(2) This process is not intended for removing dents from bonded structures with nonmetallic honeycomb core as it will

result in pulling the face sheet past the original plane, resulting in a convex surface

(3) This process is not intended for removing dents from bonded structure where a debonding condition between skin

and honeycomb core exists, as it causes a convex surface.

Retain printed data for historical reference only. For future maintenance, use only current data.