Which document must reflect that an installation meets FAA airworthiness standards?

The correct answer is based on the necessity for documentation to demonstrate compliance with FAA airworthiness standards. Installation records are specifically required to reflect that any new parts or modifications made to an aircraft have been installed in accordance with FAA standards and guidelines. These records serve as a permanent record of the installation process and provide detailed information about how and when the installation occurred, as well as demonstrating that the installation was certified in accordance with relevant regulations.

By attaching the installation records to the aircraft, it ensures traceability and accountability for the modifications or installations that have been conducted, which is crucial for maintaining the overall airworthiness of the aircraft. This is essential because it provides future maintenance personnel, inspectors, and the FAA with necessary information to verify that all installations meet safety and performance standards.

While other documents like the operation manual, maintenance record, and airworthiness certificate play important roles in the aircraft's regulatory framework, they do not specifically serve the purpose of documenting that an installation complies with the airworthiness standards at the time it was completed.