Purpose; This document sets forth the characteristics for a 4 MCU integrated digital Air Data and Inertial References System (ADIRS) intended for installation in subsonic commercial transport aircraft. It is envisioned that the ADIRS will incorporate the capabilities of both an air data system and an inertial reference system.

The intent of this document is to provide general and specific design guidance for the development of an ADIRS for airline use. It describes the desired operational capability of the system and the standards necessary to ensure interchangeability