FAA AC 25.1309-1B PDF

Purpose.

This AC describes acceptable means, but not the only means, for showing compliance with 14 CFR 25.1309, Equipment, systems, and installations. These means are intended to provide guidance to supplement the engineering and operational judgment that form the basis of any showing of compliance. The contents of this document do not have the force and effect of law and are not meant to bind the public in any way. This document is intended only to provide clarity to the public regarding existing requirements under the law or agency policies.

Revision B of this AC contains guidance based on rule changes to § 25.1309. This revision also improves upon the materials published in AC 25.1309-1A by providing more substantive guidance on safety analysis methods. It also implements Congressional instruction1 to emphasize clear applicant documentation of certain technical details and failure modes, and pilot response times to them.