Airplane Sheet Metal Circular Patch Template

Use advisory circular ac43 13 1b as a reference to determine proper rivet layout for the patch.

Airplane sheet metal circular patch template.

Another excellent source is aircraft sheet metal published by jeppesen. I used a piece of pvc pipe a vice mount miniature metal break and body hammer kit. Cutout the corners into oval or circular shape. A rounded or several sided patch is preferable over a square patch.

For reasons of availability low weight and prior manufacturing experience most early aircraft were of wood and fabric construction. At the lower speeds then obtainable streamlining was not a primary consideration and many wires struts braces and other devices were used to provide the necessary structural strength. Bending sheet metal by hand is a manageable task if the piece of sheet metal is small and thin enough to handle. 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.

If you re not sure how to approach a repair get the assistance of a qualified aviation sheet metal mechanic. I then used the templates to trace out the patch panels on some sheet metal. Cut out a circular patch from a sheet of aluminum that is the same thickness and the original aircraft skin. So i will draw a line 1 4 from the small hole and inward from the outline of the patch i drew.

The patch plate should have a cross sectional area equal to or. The reader should be familiar working with sheet metal and riveting. You will often find a crack developing in an area such as an engine cowling. When repair of a damaged part is possible first study the part carefully to fully understand its purpose or function.

Knowledge comes from learning all of the factors that affect good. Maintain the original strength. After slicing the patches out with a cutoff wheel next came the bending hammer and dolly session until the patches matched the holes and fit snug and flush into the flanged seat. In all cases your primary reference for all repairs is faa advisory circular 43 13 1b acceptable methods techniques and practices aircraft inspection and repair.

This is a very common problem on sheet metal airplanes. Basic principles of sheet metal repair. The two main qualities that all of the highly skilled sheet metal workers i have worked with possess are knowledge and patience. Maintain the original strength.

Learn how to bend sheet metal so you. Airplane airplane materials and construction. Make a template using paper. Select the appropriate material.