Airplane Sheet Metal Circular Patch Template

A rounded or several sided patch is preferable over a square patch.

Airplane sheet metal circular patch template.

Learn how to bend sheet metal so you. 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. 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. Most frequently expensive sheet metal bending tools called brakes are used to bend sheet metal but you can also complete this task without one.

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. Bending sheet metal by hand is a manageable task if the piece of sheet metal is small and thin enough to handle. Another excellent source is aircraft sheet metal published by jeppesen. Airplane airplane materials and construction.

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

For reasons of availability low weight and prior manufacturing experience most early aircraft were of wood and fabric construction. So i will draw a line 1 4 from the small hole and inward from the outline of the patch i drew. Make a template using paper. The reader should be familiar working with sheet metal and riveting.

Cut out a circular patch from a sheet of aluminum that is the same thickness and the original aircraft skin. I used a piece of pvc pipe a vice mount miniature metal break and body hammer kit. Keep the weight to a minimum prem mahendranathan. Basic principles of sheet metal repair.

Cutout the corners into oval or circular shape. When repair of a damaged part is possible first study the part carefully to fully understand its purpose or function. You will often find a crack developing in an area such as an engine cowling. The patch plate should have a cross sectional area equal to or.

The primary objective of aircraft repair is to restore damaged parts to their original condition. 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. Knowledge comes from learning all of the factors that affect good. This is a very common problem on sheet metal airplanes.