scope:

PURPOSE.

This notice provides guidelines to Aircraft Certification Office (ACO) engineers and Designated Engineering Representatives (DER) regarding the application of RTCA/DO-178B, "Software Considerations in Airborne Systems and Equipment Certification," for approval of airborne systems and equipment designed to contain user-modifiable software components. These guidelines are applicable to the approval of airborne systems and equipment and the software aspects of those systems related to type Certificates (TC), supplemental type certificates (STC), amended supplemental type certificates (ASTC), amended type certificates (ATC), and Technical Standard Order Authorizations (TSOA). This notice is for guidance purposes only and is supplemental to document DO-178B.