Free A&P Airframe Structures & Systems Questions and Answers

Question 1

What is the primary function of an aircraft's wing spar?

Accepted Answer

To carry the majority of the bending & torsional loads.

Answer

The wing spar is a principal structural member running spanwise through the wing, acting as its backbone. Its primary function is to withstand and transmit the significant bending forces (due to lift and weight) and torsional loads (twisting forces) experienced by the wing during flight, ensuring the aircraft's structural integrity.

Question 2

Which material is commonly used in modern aircraft primary structures due to its high strength-to-weight ratio?

Accepted Answer

Carbon fiber reinforced polymer (CFRP)

Answer

Carbon fiber reinforced polymer (CFRP) is widely used in modern aircraft primary structures due to its exceptional strength-to-weight ratio and stiffness. Its lightweight yet robust properties contribute significantly to improved fuel efficiency and enhanced performance compared to traditional metallic materials like aluminum.

Question 3

What is the purpose of a doubler in aircraft structural repair?

Accepted Answer

To add extra strength & distribute loads.

Answer

In aircraft structural repair, a doubler is a piece of material, typically metal, that is riveted or bonded over a damaged or weakened area. Its purpose is to reinforce the structure, restore its original strength, and effectively distribute stress loads away from the compromised section, preventing further failure.

Question 4

Which type of corrosion appears as thread-like lines under paint on aluminum surfaces?

Accepted Answer

Filiform corrosion

Answer

Filiform corrosion is a distinctive type of corrosion that appears as thread-like filaments growing under a protective coating, typically paint, on aluminum or magnesium surfaces. It initiates at small defects in the coating and propagates as a result of differential aeration cells, often resembling fine worms.

Question 5

What is the correct sequence for installing a rivet in structural repair?

Accepted Answer

Drill hole → Insert rivet → Buck tail → Inspect

Answer

The correct sequence for installing a rivet ensures a strong and proper connection in structural repair. First, a precise hole is drilled, then the rivet is inserted into the hole. Next, the "buck tail" is formed by deforming the rivet's shank, creating a secure joint, and finally, the installation is inspected for quality and integrity.

A&P - Certified Aircraft Mechanic Practice Test

A&P - Certified Aircraft Mechanic Practice Test

Free A&P Airframe Structures & Systems Questions and Answers