Aircraft Structures & Materials 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 & Materials flashcards as text
What is the primary difference between a truss-type fuselage and a monocoque fuselage?
Answer: Truss-type relies on an internal framework of tubes or beams; monocoque relies on stressed skin
A truss-type fuselage uses welded or bolted tubes/beams for the primary structure with a non-structural skin covering, while monocoque relies on the skin itself to carry loads.
What is the significance of 'limit load' in aircraft structural certification?
Answer: The maximum load expected in service, which the structure must carry without permanent deformation
Limit load is the maximum load anticipated in normal service operations; the structure must sustain limit load without permanent deformation.
What condition is indicated when an aluminum surface shows white, powdery deposits?
Answer: Active aluminum oxide (surface corrosion)
White, powdery deposits on aluminum indicate aluminum oxide forming from active surface corrosion, which must be removed and treated.
Which fastener is most appropriate for joining composite panels where galvanic corrosion with aluminum must be avoided?
Answer: Titanium fasteners
Titanium fasteners are used with carbon fiber composites because titanium is galvanically compatible with carbon fiber, preventing the galvanic corrosion that would occur with aluminum or steel fasteners.
What is the purpose of 'drain holes' in aircraft lower skin panels and fairings?
Answer: To allow moisture to drain out and prevent corrosion-causing water accumulation
Drain holes allow trapped moisture to escape from low points in the structure, preventing corrosive water accumulation in pockets and cavities.
What is 'fatigue failure' in aircraft metals?
Answer: Progressive cracking caused by repeated cyclic stress below the ultimate strength
Fatigue failure is the progressive initiation and growth of cracks in a material subjected to repeated cyclic stresses, eventually leading to fracture at loads well below ultimate strength.
What material is typically used for aircraft firewall construction to contain engine compartment fires?
Answer: Stainless steel or titanium sheet
Firewalls are constructed from stainless steel or titanium because these materials maintain structural integrity at the high temperatures generated by engine compartment fires.