AMT Airframe Structures 2 — Questions and Answers
Question 1: What type of stress acts perpendicular to the cross-section of a structural member and tends to pull it apart?
- Shear stress
- Torsional stress
- Tensile stress (Correct answer)
- Compressive stress
Correct answer: Tensile stress
Tensile stress acts perpendicular to a cross-section and tends to elongate or pull apart the material.
Question 2: In a semi-monocoque fuselage, which structural members primarily carry bending loads along the fuselage length?
- Frames and formers
- Longerons and stringers (Correct answer)
- Skin panels
- Bulkheads
Correct answer: Longerons and stringers
Longerons and stringers run longitudinally and are the primary members resisting bending loads in a semi-monocoque structure.
Question 3: What is the purpose of a "weep hole" in an aircraft wing structure?
- To reduce aerodynamic drag
- To allow moisture drainage and prevent corrosion (Correct answer)
- To provide access for fuel line routing
- To vent fuel tank pressure
Correct answer: To allow moisture drainage and prevent corrosion
Weep holes allow accumulated moisture to drain from structural cavities, preventing corrosion buildup.
Question 4: When inspecting a composite structure for delamination, which non-destructive testing method uses sound wave reflections?
- Eddy current inspection
- Magnetic particle inspection
- Ultrasonic inspection (Correct answer)
- Dye penetrant inspection
Correct answer: Ultrasonic inspection
Ultrasonic inspection uses high-frequency sound waves that reflect off internal defects like delamination in composite structures.
Question 5: A wing rib that does NOT extend the full depth of the wing and is used to maintain airfoil shape between main ribs is called a:
- Main rib
- False rib (Correct answer)
- Compression rib
- Drag rib
Correct answer: False rib
A false rib (or nose rib/auxiliary rib) spans only the leading edge area and helps maintain airfoil contour between full-depth ribs.
Question 6: Which aircraft skin fastening method creates the strongest and most permanent structural joint?
- Sheet metal screws
- Hi-Lok fasteners
- Rivets (Correct answer)
- Bonding with structural adhesive
Correct answer: Rivets
Solid shank rivets, when properly installed, create a permanent high-strength structural joint widely used in aircraft construction.
Question 7: What structural component transfers wing bending loads into the fuselage at the wing root?
- Drag strut
- Wing spar carry-through (Correct answer)
- Empennage attach fitting
- Aileron bellcrank
Correct answer: Wing spar carry-through
The spar carry-through (or center section) bridges the two wing spars through the fuselage, transferring bending loads across the wing root.
AMT Airframe Structures 2
What type of stress acts perpendicular to the cross-section of a structural member and tends to pull it apart?