Airplane Sheet Metal Circular Patch Template

Basic principles of sheet metal repair.

Airplane sheet metal circular patch template.

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. This is a very common problem on sheet metal airplanes. Most frequently expensive sheet metal bending tools called brakes are used to bend sheet metal but you can also complete this task without one. 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.

So i will draw a line 1 4 from the small hole and inward from the outline of the patch i drew. Cut out a circular patch from a sheet of aluminum that is the same thickness and the original aircraft skin. The two main qualities that all of the highly skilled sheet metal workers i have worked with possess are knowledge and patience. If you re not sure how to approach a repair get the assistance of a qualified aviation sheet metal mechanic.

Select the appropriate material. I then used the templates to trace out the patch panels on some sheet metal. Maintain the original strength. For reasons of availability low weight and prior manufacturing experience most early aircraft were of wood and fabric construction.

Knowledge comes from learning all of the factors that affect good. The primary objective of aircraft repair is to restore damaged parts to their original condition. 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. Use advisory circular ac43 13 1b as a reference to determine proper rivet layout for the patch.

Airplane airplane materials and construction. Keep the weight to a minimum prem mahendranathan. The reader should be familiar working with sheet metal and riveting. Learn how to bend sheet metal so you.

Another excellent source is aircraft sheet metal published by jeppesen. The patch plate should have a cross sectional area equal to or. I used a piece of pvc pipe a vice mount miniature metal break and body hammer kit. A rounded or several sided patch is preferable over a square patch.

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