AC 21-33, Quality Assurance of Software Used in Aircraft or Related Products

his advisory circular (AC) provides an acceptable means, but not the only means, to show compliance with the quality assurance requirements of Federal Aviation Regulations (FAR) Part 21, Certification Procedures for Products and Parts, as applicable to the production of software used in type certificated aircraft or related products (airborne software). This AC also provides supplemental guidance for the establishment of a quality control or inspection ystem to control the development and production of software used in type certifcation aircraft. It supplements AC 21-1, Production Certificates; AC 21-6, Production Under Type Certificate Only; AC 21-20, Supplier Surveillance Procedures; AC 20-115, Radio Technical Commission for Aeronautics Document RTCA/DO-178, and AC 21-303.1, Certification Procedures for Products and Parts.