Section 147.23 - Quality control system(a) Each certificated aviation maintenance technician school must-(1) Be accredited within the meaning of 20 U.S.C. 1001(a)(5) ; or(2) Establish and maintain a quality control system that meets the requirements specified in paragraph (b) of this section, and is approved by the Administrator.(b) The quality control system specified in paragraph (a)(2) of this section must provide procedures for recordkeeping, assessment, issuing credit, issuing of final course grades, attendance, ensuring sufficient number of instructors, granting of graduation documentation, and corrective action for addressing deficiencies.