A&P Sheet Metal Structural Repair Questions and Answers

Question 1

A technician is repairing a longitudinal crack in a stressed aircraft skin panel. The first step is to stop-drill the ends of the crack. What is the primary reason for this action?

Accepted Answer

To relieve stress concentrations at the crack tips and prevent further propagation.

Answer

To create a starting point for sawing out the damaged section.

Answer

To provide an anchor point for the crack patching compound.

Answer

To allow for the insertion of inspection equipment to determine crack depth.

Question 2

When performing a sheet metal repair, a technician must select the proper rivet length. The general rule for determining the length of a solid shank rivet is that it should be equal to the total thickness of the material being joined plus what additional amount?

Accepted Answer

1.5 times the rivet's diameter

Answer

1.0 times the rivet's diameter

Answer

0.5 times the rivet's diameter

Answer

2.0 times the rivet's diameter

Question 3

A repair on an aluminum alloy skin panel requires making a 90-degree bend. Which of the following terms describes the amount of material that must be added to the sum of the two leg lengths to determine the total flat pattern length?

Accepted Answer

Bend allowance

Answer

Setback

Answer

Bend deduction

Answer

K-Factor

Question 4

A technician needs to find approved repair procedures for a damaged main structural member on a specific large aircraft. Which of the following documents should be consulted first?

Accepted Answer

The manufacturer's Structural Repair Manual (SRM)

Answer

AC 43.13-1B

Answer

The aircraft's flight manual

Answer

The Illustrated Parts Catalog (IPC)

Question 5

Certain aluminum alloy rivets, such as 2017 and 2024, are heat-treated and then stored at low temperatures before use. What is the purpose of this quenching and refrigeration process?

Accepted Answer

To keep them in a softened, workable state (annealed) for driving.

Answer

To increase their shear strength permanently.

Answer

To improve their electrical conductivity for bonding.

Answer

To pre-harden them so they can be driven with less force.

Question 6

When installing a repair patch over a damaged area, what is the generally accepted minimum edge distance for a single row of rivets, measured from the center of the rivet hole to the nearest edge of the sheet?

Accepted Answer

2.0 times the rivet diameter

Answer

1.0 times the rivet diameter

Answer

3.0 times the rivet diameter

Answer

4.0 times the rivet diameter