Airframe Mechanic Certification Sheet Metal Structural Repairs 4

Question 1

When performing a scab patch repair on aircraft skin, the patch material should be:

Accepted Answer

The same material and temper as the original skin

Answer

Patch material must match the original skin in alloy, temper, and thickness to ensure compatible strength and fatigue characteristics.

Question 2

Which tool is used to measure the diameter of a drilled hole to ensure it is the correct size for the rivet being installed?

Accepted Answer

Pin gauges or 'go/no-go' gauges

Answer

Pin gauges (go/no-go gauges) quickly verify that drilled holes fall within the acceptable tolerance range for the specified rivet diameter.

Question 3

What is the function of a 'joggle' in a sheet metal repair or splice?

Accepted Answer

To allow one sheet to overlap another while maintaining a flush outer surface

Answer

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.

Question 4

When removing a solid shank rivet, the drill bit diameter used should be:

Accepted Answer

Slightly smaller than the rivet shank diameter to avoid enlarging the hole

Answer

Drilling slightly smaller than the shank diameter allows the rivet head to be punched off cleanly without enlarging the hole for the replacement rivet.

Question 5

Which class of fit is required for structural rivet holes in primary aircraft structure?

Accepted Answer

Close tolerance fit (±0.001" of nominal)

Answer

Structural rivet holes require a close tolerance fit so the rivet fills the hole properly when driven, ensuring maximum bearing strength.

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Practice Test

Airframe Mechanic Certification Sheet Metal Structural Repairs 4