Sheet Metal 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 Sheet Metal Structures flashcards as text
A cracked sheet metal skin panel that extends to within one rivet pitch of a stringer attachment must be repaired by:
Answer: Replacing the damaged skin section and using the stringer as part of the repair boundary
When a crack extends near structural members, the repair design must incorporate those members as boundaries and cannot rely on stop-drilling alone.
What information is found on a sheet metal part's material callout such as '2024-T3 ALCLAD .040'?
Answer: Alloy, temper, cladding type, and sheet thickness in inches
The callout '2024-T3 ALCLAD .040' specifies the aluminum alloy (2024), temper (T3), that it has alclad corrosion-resistant cladding, and the sheet thickness is 0.040 inches.
When inspecting a riveted skin splice for serviceability, which condition would require immediate repair?
Answer: A crack emanating from a rivet hole
A crack emanating from a rivet hole is a critical defect that requires immediate repair because it will grow under fatigue loading.
The 'neutral axis' of a sheet metal bend is important because:
Answer: It is the layer that experiences neither compression nor tension and has no change in length
The neutral axis is the theoretical line within the material that is neither stretched nor compressed during bending, and its location determines bend allowance.
Which rivet installation defect is called a 'clinched' rivet?
Answer: A rivet whose shank has bent over instead of forming a proper shop head
A clinched rivet occurs when the shank bends sideways rather than mushrooming outward, resulting in a bent shank and poor joint quality.
What is the correct procedure when a drilled rivet hole is found to be oversize beyond acceptable limits?
Answer: Install a rivet of the next larger diameter, using the SRM for the next standard oversize
An oversize hole must be filled with a rivet of the next standard oversize diameter as specified in the Structural Repair Manual.
Stress corrosion cracking in high-strength aluminum alloys is most likely to initiate when:
Answer: Sustained tensile stress acts on the material in a corrosive environment
Stress corrosion cracking requires the simultaneous combination of sustained tensile stress and a corrosive environment to initiate and propagate.