FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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What does the number 2 indicate in the aluminum alloy 2024-T36?

The year it was made
The primary alloying agent
The hardness level
The series designation

The correct answer is: The primary alloying agent

In the aluminum alloy designation 2024-T36, the number 2 indicates the primary alloying agent used in the material, which is copper. Aluminum alloy designations follow a specific coding system where the first digit represents the major alloying element or elements. In this case, the number 2 signifies that copper is the primary alloying agent in the 2024 aluminum alloy. This coding system helps to quickly identify the composition of the alloy and its properties.