This paper outlines an appraisal of aircraft design for maintainability as viewed by the Federal Aviation Administration. The basis for FAA's authority in the Act is set forth. The extent of the applicable requirements now in the Federal Air Regulations is traced. Maintenance concepts and examples of adverse air-worthiness situations are described. Controls and procedures employed by FAA to account for maintainability of new designs, including MSG-2, are explained. Maintainability guidelines applicable to new designs are advanced.