Airframe Mechanic Certification Aircraft Structures & Materials 4

Question 1

What is the purpose of a fuselage bulkhead?

Accepted Answer

To carry concentrated loads and maintain fuselage cross-sectional shape

Answer

Bulkheads are strong transverse structural members that carry concentrated loads (such as wing attachment forces) and maintain the fuselage cross-sectional shape.

Question 2

Which composite fiber offers the highest stiffness per unit weight among commonly used aerospace reinforcements?

Accepted Answer

Carbon/graphite fiber

Answer

Carbon/graphite fiber has the highest stiffness-to-weight ratio of common aerospace reinforcements, making it ideal for primary structural applications.

Question 3

What is 'delamination' in composite structures?

Accepted Answer

Separation of layers within the laminate

Answer

Delamination is the separation of individual plies or layers within a composite laminate, often caused by impact, moisture, or manufacturing defects.

Question 4

What heat treatment process is used to increase the hardness and strength of 2024 aluminum after solution heat treatment?

Accepted Answer

Age hardening (precipitation hardening)

Answer

Age hardening (precipitation hardening) allows alloying elements to precipitate within the aluminum matrix over time, increasing strength and hardness.

Question 5

What does the term 'fail-safe' mean in aircraft structural design?

Accepted Answer

If one structural member fails, alternate load paths prevent catastrophic failure

Answer

Fail-safe design ensures that if any single structural element fails, alternative load paths exist to prevent complete structural failure.

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Aircraft Structures & Materials 4