During an annual inspection, which document is considered approved data?

The airworthiness limitations section is considered approved data during an annual inspection because it contains critical maintenance and operational requirements that directly impact the aircraft's safety and compliance with regulatory standards. This section outlines the specific limitations, necessary inspections, and mandatory replacement times for components within the aircraft, ensuring that it remains airworthy. The contents of the airworthiness limitations are required to be adhered to as part of regulatory compliance under the Federal Aviation Administration (FAA) standards.

Other documents, while they may contain useful information for maintenance, do not carry the same regulatory weight as approved data. The structural repair manual provides guidelines for repairs but is not universally seen as approved data. The Technical Data Document and Inspection Procedures Manual provide helpful procedures or standards, yet they do not specifically define airworthiness limitations. Therefore, the airworthiness limitations section stands out as the key document embodying approved data necessary for an annual inspection.