Purpose: This document sets forth the characteristics of an integrated digital Air Data and Inertial Reference 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 will describe the desired operational capability of the system and the standards necessary to ensure interchangeability.