Federal Aviation Administration FAA FARs (Title 14 of the Code of Federal Regulations) define a “major alteration” as “an alteration not listed in the aircraft, aircraft engine, or propeller specifications 1) that might appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting airworthiness; or 2) that is not done…

 Accountable Directorate: The aircraft certification directorate with final authority, accountability, and responsibility for type certification programs, the development of airworthiness standards, and development and standardization of technical policy for an assigned product and a specific part of Title 14 of the Code of Federal Regulations (14 CFR). Aircraft Certification Office (ACO): The aircraft certification directorate’s…