What Are Manufacturer Manuals? Manufacturer manuals are official technical documents issued by aircraft and component manufacturers. These manuals provide approved instructions for maintaining, inspecting, repairing, and overhauling aircraft and their components. Manufacturer manuals provide approved procedures and limits essential for safe and compliant aircraft maintenance In aviation maintenance, manufacturer manuals are the primary and mandatory source of information used by engineers and technicians to ensure safe, compliant, and reliable aircraft operations. Official Documents Issued by Manufacturers Manufacturer manuals are produced by: Aircraft manufacturers (e.g., Boeing, Airbus) Engine manufacturers Component manufacturers These documents are developed during the design and certification phase of the aircraft or component and are approved by aviation authorities such as the FAA and EASA . Provide Approved Maintenance Instructions One of the ...