What does the "AD" in AD 2117 represent in terms of rivet material?

The designation "AD" in AD 2117 refers to "Aluminum Alloy Designation." In aircraft manufacturing and repair, understanding the material specifications is crucial for ensuring structural integrity, especially in areas subjected to high stress or requiring weight management. The designation system helps identify the specific alloy and its properties.

For example, 2117 is a specific type of aluminum alloy that is often used in aircraft manufacturing due to its favorable characteristics, such as good strength and resistance to corrosion. Knowing that "AD" indicates the aluminum alloy designation allows technicians and engineers to select the appropriate rivets that meet the design requirements and maintain the safety and performance standards of the aircraft.

Understanding the correct designation also helps differentiate from other possible interpretations, such as those that might refer to organizational acronyms or unrelated parameters that do not pertain to the material properties essential for structural repair.