This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist. This document was developed by the SAE AS-1B5 CLARA Task Group to explain and document background information and decisions with associated rationale made in development of the CLARA Interface Control Document (ICD), AIR5682. This rationale document is published separately to preserve information that is not required or provided in the ICD but may be important to users.