Aircraft Structures Flashcards
7 cards from real Airframe Mechanic Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Aircraft Structures flashcards as text
What type of stress acts perpendicular to the cross-section of a structural member and tends to pull it apart?
Answer: Tension
Tension is a pulling force that acts perpendicular to the cross-section and tends to elongate or pull a structural member apart.
In a semi-monocoque fuselage, which structural members run longitudinally and carry primary bending loads?
Answer: Stringers
Stringers run longitudinally along the fuselage and carry primary bending and axial loads in a semi-monocoque structure.
What is the primary purpose of a wing's main spar?
Answer: Carry bending and shear loads from lift
The main spar is the primary load-carrying member of the wing, designed to resist bending and shear forces generated by lift.
Which aluminum alloy series is most commonly used in aircraft primary structure due to its high strength-to-weight ratio?
Answer: 2024 series
2024-T3 aluminum alloy is widely used in aircraft primary structure because of its excellent strength-to-weight ratio and fatigue resistance.
A crack found running parallel to the length of a fuselage stringer is most likely caused by which type of stress?
Answer: Hoop stress
Hoop (circumferential) stress from pressurization acts perpendicular to the fuselage axis, causing cracks that run parallel to longitudinal members.
What document defines the allowable damage limits and repair procedures for a specific aircraft structure?
Answer: Structural Repair Manual (SRM)
The Structural Repair Manual (SRM) provides manufacturer-approved damage limits, inspection criteria, and repair procedures for the airframe.
In aircraft construction, what is the function of a gusset plate?
Answer: Reinforce joints between structural members
Gusset plates are triangular or shaped reinforcing plates used to strengthen joints and distribute loads between intersecting structural members.