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
When performing a repair on aircraft skin using a flush patch, the patch material must be:
Answer: The same material type and temper as the original skin
Repair patches must match the original material specification (alloy and temper) to maintain the structural and corrosion properties of the original design.
A 'pilot hole' in sheet metal work is:
Answer: A small-diameter starter hole drilled before final-size drilling
A pilot hole is a small-diameter hole drilled first to guide the final-size drill and improve hole location accuracy.
What does the 'T' designation (such as T3, T4, T6) indicate in aluminum alloy nomenclature?
Answer: The temper (heat treatment condition) of the alloy
The T designation indicates the temper, which describes the specific heat treatment or work-hardening process applied to achieve desired mechanical properties.
During a sheet metal repair, when must a doubler be used in addition to the filler patch?
Answer: Whenever the damaged area exceeds the allowable limits for a simple filler patch
A doubler is required when damage exceeds the limits for a simple filler patch, providing the additional material needed to restore original structural strength.
Fretting corrosion between sheet metal components most commonly occurs due to:
Answer: Slight relative motion between faying surfaces under vibration
Fretting corrosion is caused by microscopic relative motion between tightly fitted surfaces under vibration, which wears away protective oxide layers.
When laying out rivet rows, the transverse pitch (row spacing) should be at minimum:
Answer: 75% of the rivet pitch within the row
Transverse pitch (distance between rows) should be at least 75% of the longitudinal pitch to maintain proper load distribution.
What is the purpose of applying sealant between sheet metal faying surfaces in pressurized areas?
Answer: To prevent cabin air leaks and provide corrosion protection
Sealant on faying surfaces in pressurized areas prevents pressurized air from leaking and also inhibits corrosion by excluding moisture from the joint.