What document must individuals performing an annual or 100-hour inspection use?

The correct answer is the inspection checklist from the appendix of 14 CFR Part 43 because this document is specifically mandated for use during annual and 100-hour inspections of aircraft in the United States. The checklist provides a standardized framework that must be followed to ensure compliance with federal regulations regarding maintenance and inspection processes. Utilizing this checklist helps maintain consistency, safety, and thoroughness in inspections, ensuring all required tasks are completed and documented properly.

While a manufacturer's manual can provide valuable information tailored to specific aircraft, it does not substitute the regulatory requirements outlined in 14 CFR Part 43. A personal checklist might be beneficial for personal organization, but it lacks the authority and standardization required by regulations, potentially leading to oversights. Similarly, an approved aviation textbook may contain useful theoretical knowledge but is not designed as a practical tool for conducting regulatory inspections. Thus, the inspection checklist in the appendix of 14 CFR Part 43 is essential for meeting legal mandates and maintaining safety standards in aviation.