Description / Abstract: This document is a resource for civil aviation authorities and the aviation industry when the operation and maintenance of aircraft and the effects of information security threats can affect aircraft safety. It deals with the activities that need to be performed in operation and maintenance of the aircraft related to information security threats.

This document also guidance that is related to operational and commercial effects (i.e. guidance that exceeds the safety-only effects). Thus, it also supports harmonizing security guidance documents among Design Approval Holders (DAH), which is deemed beneficial to DAHs, operators and civil aviation authorities. It is a companion document to DO-326A that supports security in the development and modification part of the airworthiness process.