Which publication might be consulted for maintaining an older aircraft without a maintenance manual?

The best publication to consult for maintaining an older aircraft without a maintenance manual is AC 43.13-1B or its latest revision. This advisory circular provides guidance and acceptable practices for aircraft maintenance and alteration, specifically addressing situations where a manufacturer's maintenance manual may not be available.

AC 43.13-1B covers a wide range of topics on maintenance procedures, materials, and techniques and serves as a resource for mechanics tasked with ensuring that older aircraft remain airworthy and compliant with safety standards. The information found in this publication is particularly valuable for mechanics working on aging aircraft where documentation may not be readily accessible.

Other options, while related to aviation regulations, don't serve the same purpose for direct maintenance guidance like AC 43.13-1B does. FAR Part 43, Appendix D outlines the scope and performance of maintenance, but it lacks the specific maintenance practices and details needed for older aircraft without dedicated manuals. FAR Part 25 pertains to airworthiness standards for transport category airplanes and isn't applicable to maintenance practices for older models, and FAR Part 91 is focused on general operating and flight rules rather than maintenance procedures.