Airframe Mechanic Certification Sheet Metal Structures 3

Question 1

When selecting a replacement rivet after removing a damaged rivet, what size rivet should typically be used if the hole is not damaged?

Accepted Answer

Same diameter and same length as the original

Answer

If the hole is undamaged, the replacement rivet should be the same diameter and appropriate driven length as the original specification.

Question 2

Which alclad aluminum alloy sheet is most commonly used for aircraft skin applications due to its high strength-to-weight ratio?

Accepted Answer

2024-T3

Answer

2024-T3 alclad is the most common aircraft skin material, offering high strength combined with the corrosion protection of the pure aluminum cladding.

Question 3

A scratch or gouge in aluminum skin that does not penetrate more than 10% of the sheet thickness is typically classified as:

Accepted Answer

Negligible damage requiring no repair

Answer

Scratches not exceeding 10% of sheet thickness are generally classified as negligible damage and require only cleaning and protective treatment.

Question 4

When riveting near a formed flange or edge, which direction should the bucking bar force be applied relative to the rivet shank?

Accepted Answer

Parallel to the rivet shank (axially)

Answer

The bucking bar must be held perpendicular to the sheet surface and aligned axially with the rivet shank to form a properly shaped driven head.

Question 5

What is the primary advantage of using a flush (countersunk) rivet on external aircraft skin?

Accepted Answer

It reduces aerodynamic drag by maintaining a smooth surface

Answer

Flush rivets create a smooth aerodynamic surface by seating the head level with the skin, reducing drag compared to protruding head rivets.

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Sheet Metal Structures 3