Airframe Mechanic Certification Sheet Metal Structural Repairs 3

Question 1

When laying out a rivet pattern for a patch repair, the transverse pitch (row spacing) should typically be:

Accepted Answer

0.866 times the longitudinal pitch (for staggered rows)

Answer

For staggered rivet rows, transverse pitch is 0.866 times the longitudinal pitch to maintain proper load distribution.

Question 2

What is 'chem-milling' used for in aircraft sheet metal fabrication?

Accepted Answer

Selectively removing material from sheet metal using chemical etching to reduce weight

Answer

Chem-milling uses controlled chemical etching to precisely remove material from selected areas to reduce weight while maintaining structural integrity.

Question 3

A rivet that has been improperly driven and shows a cracked or split tail should be:

Accepted Answer

Removed and replaced

Answer

A cracked or split rivet tail indicates a faulty installation; the rivet must be drilled out and replaced with a new one.

Question 4

Which aluminum alloy is most commonly used for aircraft skin panels due to its excellent strength-to-weight ratio and corrosion resistance when alclad?

Accepted Answer

2024-T3

Answer

2024-T3 aluminum is the most widely used aircraft skin alloy, offering high strength, good fatigue resistance, and excellent workability when alclad coated.

Question 5

When using a hand squeezer to set rivets, which type of rivet set should be used to avoid damaging the surrounding sheet surface?

Accepted Answer

Either a flat or crowned set depending on rivet head type

Answer

Flat sets are used for universal (round) heads and crowned sets for brazier heads; the correct set prevents marring the surrounding sheet.

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Sheet Metal Structural Repairs 3