Skip to page content

USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Site Notification

Site Notification

United States Department of TransportationUnited States Department of Transportation

AC 20-156 - Aviation Databus Assurance

Document Information

Aviation Databus Assurance
Date issued
Office of Primary Responsibility
a. This advisory circular (AC) is for aircraft and aircraft engine manufacturers anddesigners. We provide a means to gain Federal Aviation Administration (FAA) approval of your aviation databus by showing the databus design performs its intended function and satisfies the applicable airworthiness requirements when installed on an aircraft or aircraft engine. b. This AC is not mandatory and does not constitute a regulation. This AC describes anacceptable means, but is not the only means, to gain databus certification. However, if you use the means described, you must follow it in all important respects.