AMT Sheet Metal Structural Repair 3

Question 1

Which repair method restores the greatest percentage of original strength in a damaged aircraft skin panel?

Accepted Answer

Flush patch repair

Answer

A flush patch (insert patch) restores close to 100% of original strength because it maintains the original skin thickness and aerodynamic surface.

Question 2

What is the correct sequence for laying out rivet holes in a sheet metal repair pattern?

Accepted Answer

Mark rivet locations, drill patch, cleco, drill structure

Answer

Rivet holes are laid out on the patch first, drilled, then the patch is clecoed to the structure and used as a template to drill the structure.

Question 3

Which type of corrosion is most likely to occur between aluminum aircraft skin and a steel fastener?

Accepted Answer

Galvanic corrosion

Answer

Galvanic corrosion occurs when dissimilar metals (aluminum and steel) are in electrical contact in the presence of an electrolyte.

Question 4

What is the purpose of using a cleco fastener during a sheet metal repair?

Accepted Answer

To temporarily hold parts in alignment while drilling and riveting

Answer

Clecos are temporary spring-loaded fasteners used to hold sheets in position while remaining holes are drilled and rivets installed.

Question 5

When cutting a repair patch from aluminum sheet stock, the corners of rectangular patches should be:

Accepted Answer

Clipped or radiused to reduce stress concentration

Answer

Square corners on repair patches create stress concentrations that can initiate cracks, so corners must be radiused or clipped.

(AMT) Aviation Maintenance Technician Practice Test