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 scab patch repair on aircraft skin, the patch material should be:
Answer: The same material and temper as the original skin
Patch material must match the original skin in alloy, temper, and thickness to ensure compatible strength and fatigue characteristics.
Which tool is used to measure the diameter of a drilled hole to ensure it is the correct size for the rivet being installed?
Answer: Pin gauges or 'go/no-go' gauges
Pin gauges (go/no-go gauges) quickly verify that drilled holes fall within the acceptable tolerance range for the specified rivet diameter.
What is the function of a 'joggle' in a sheet metal repair or splice?
Answer: To allow one sheet to overlap another while maintaining a flush outer surface
A joggle is an offset formed in sheet metal so that a lap joint can be made flush on the outer surface without a protruding step.
When removing a solid shank rivet, the drill bit diameter used should be:
Answer: Slightly smaller than the rivet shank diameter to avoid enlarging the hole
Drilling slightly smaller than the shank diameter allows the rivet head to be punched off cleanly without enlarging the hole for the replacement rivet.
Which class of fit is required for structural rivet holes in primary aircraft structure?
Answer: Close tolerance fit (±0.001" of nominal)
Structural rivet holes require a close tolerance fit so the rivet fills the hole properly when driven, ensuring maximum bearing strength.
A 'tension head' (100° countersunk) rivet is used instead of a universal head rivet primarily when:
Answer: A flush surface is required on the exterior skin for aerodynamic smoothness
Flush (countersunk) rivets are used on exterior aerodynamic surfaces to minimize drag by maintaining a smooth, unbroken skin surface.
What is the minimum number of rivets required in a single rivet row for a repair splice on primary aircraft structure according to AC 43.13-1B?
Answer: Three rivets per side of the splice
AC 43.13-1B requires at least three rivets per side of the splice in any single row to ensure adequate load transfer in primary structure repairs.