1. 8515-2. The action required by an AD may take what form? 1. Inspection. 2. Part(s) replacement. 3. Design modification. 4. Change in operating procedure(s). 5. Overall change in the content, form and disposition of aircraft maintenance records. A. 1, 2, 3, and/or 4. B. 1, 2, 3, and/or 5. C. 1, 2, 3, 4, and/or 5.