Sheet Metal Structural Repairs 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 Structural Repairs flashcards as text
When performing a sheet metal repair, the minimum edge distance for a rivet from the edge of the sheet is typically:
Answer: 1.5 times the rivet diameter
Minimum edge distance is 1.5 times the rivet diameter to prevent sheet splitting or edge tearout.
Which type of corrosion appears as a white or gray powdery deposit on aluminum aircraft skin?
Answer: Surface oxidation (white corrosion)
White or gray powdery deposits on aluminum are characteristic of surface oxidation, the most common and easily treated form of aluminum corrosion.
A 'stop-drill' is used in sheet metal repair to:
Answer: Halt crack propagation by removing the stress concentration at the crack tip
Stop-drilling places a hole at the end of a crack to redistribute stress and prevent the crack from continuing to grow.
What is the purpose of using a dimpling operation in sheet metal work?
Answer: To create a countersunk recess in thin sheets that cannot be machine countersunk
Dimpling forms a countersunk recess in sheet metal that is too thin to machine countersink, allowing flush rivet installation.
When sizing a rivet for a sheet metal repair, the correct rivet diameter should be:
Answer: 3 times the thickness of the thickest sheet
Rivet diameter should be approximately 3 times the thickness of the thickest sheet being joined for optimal strength.
Which repair method is used when the damage to an aircraft skin panel is too extensive for a patch but the surrounding structure is still sound?
Answer: Section replacement
Section replacement removes the entire damaged section and replaces it with new material when damage is too extensive for patching.
What document must be consulted before performing any structural repair on a certificated aircraft?
Answer: The aircraft's structural repair manual (SRM) or AC 43.13-1B
The Structural Repair Manual (SRM) or AC 43.13-1B must be consulted to ensure all repairs meet approved data and airworthiness standards.