Aircraft Sheet Metal Patch Repair Procedure

Basic airframe repair subcourse number al0992 edition a us army aviation logistics school fort eustis virginia 23604 5439 4 credit hours edition date.

Aircraft sheet metal patch repair procedure.

The user has determined that it is appropriate to the product being repaired. Cut out a circular patch from a sheet of aluminum that is the same thickness and the original aircraft skin. The doubler should be of a. Sometimes the experience to achieve the desirable results can be costly.

Fabricate a doubler of the same material but one size thicker than the part being repaired. Stop drill the crack ends with a no. Maximum rivet diameter is three times the thickness of the thickest sheet to be riveted. Principal requirements in repair of structures inspection of the damage and accurate estimate of the type of repair required important steps in repairing structural damage.

Aircraft sheet metal work prem mahendranathan structural repair. The patch plate should have a cross sectional area equal to or greater than that of the original damage. Attach the doubler to the part with clamps and drill holes. Removal of rivet heads with a cold chisel and hammer is not recommended because skin damage and distorted rivet holes will probably result.

The resources and approved data vary by aircraft and operation but generally include the manufacturer s structural repair manual maintenance manual and ac. The art of sheet metal repair. If the rivet is too long the formed head will be too large or the rivet may bend or. Maintain the original strength.

Supported metal skin support the sheet metal on the inside with a bucking bar. Minimum rivet diameter is equal to the thickness of the thickest sheet to be riveted. The primary objective of aircraft repair is to restore damaged parts to their original condition. September 1994 subcourse overview this subcourse is designed to provide you with a general familiarization of the airframe of today s aircraft and repair procedures.

Maintain the original strength. Place a splice where the member is. The repair data may also be used as approved data and the ac chapter page and paragraph listed in block 8 of faa form 337 when. Control parts wing covering or similar parts of the aircraft.

The proper length of rivet is an important part of the repair. In spect rivet joints adjacent to damaged structure for partial failure by removing one or more. When repair of a damaged part is possible first study the part carefully to fully understand its purpose or function. Debur the outer edge of the patch.

Basic principles of sheet metal repair. It is directly applicable to the repair being made.