Skip to page content
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.

The latest general information on the Coronavirus (COVID-19) is available on For FAA-specific COVID-19 resources, please visit
United States Department of TransportationUnited States Department of Transportation

Automatic Dependent Surveillance - Broadcast (ADS-B)

Automatic Dependent Surveillance – Broadcast (ADS-B)

Automatic Dependent Surveillance–Broadcast (ADS–B) is an advanced surveillance technology that combines an aircraft’s positioning source, aircraft avionics, and a ground infrastructure to create an accurate surveillance interface between aircraft and ATC. ADS–B is a performance–based surveillance technology that is more precise than radar and consists of two different services: ADS–B Out and ADS–B In.

Contact Us

ADS-B Out works by broadcasting information about an aircraft's GPS location, altitude, ground speed and other data to ground stations and other aircraft, once per second. ADS-B Out airspace and equipment requirements are contained in 14 CFR § 91.225 and the equipment performance requirements are contained in §91.227. ADS-B In provides operators of properly equipped aircraft with weather and traffic position information delivered directly to the cockpit.

Here you can find links to ADS-B regulations and guidance, as well as detailed information on the airspace and equipment requirements and capabilities.

Number Title
§ 91.225 Automatic Dependent Surveillance-Broadcast (ADS-B) Out Equipment and Use
§ 91.227 Automatic Dependent Surveillance-Broadcast (ADS-B) Out Equipment Performance Requirements
Advisory Circulars (AC)
Number Title
90-114B Automatic Dependent Surveillance-Broadcast Operations

Note: The FAA does not require an authorization to conduct ADS-B Out operations in the airspace specified in § 91.225 (U.S. airspace). Additionally, there is no authorization required to use ADS-B In for basic traffic situational awareness. However, an authorization is required to conduct the more advanced operations using ADS-B In, such as CDTI Assisted Visual Separation (CAVS), and In-Trail Procedure. You will find information and links to guidance material here.

OpSpec A354 – To conduct ADS-B In-Trail Procedure, the Operator must request and be issued OpSpec A354.

OpSpec A355 – To conduct CDTI Assisted Visual Separation (CAVS) using ADS-B IN, the Operator must request and be issued OpSpec A355. To expedite the process, the A355 Operator Application Checklist (CAVS) should be used.

FAA Internal Guidance
Number Title
Order 8900.1, Vol.3, Ch.18, § 3 (A354) OpSpec/MSpec/LOA A354–Automatic Dependent Surveillance-Broadcast (ADS-B) In-Trail Procedure (ITP)
Order 8900.1, Vol.3, Ch.18, § 3 (A355) OpSpec/MSpec/LOA A355–Automatic Dependent Surveillance-Broadcast (ADS-B) In Operations
Operations Specifications Application Checklists
Number Title
A355 CDTI Assisted Visual Separation (CAVS) Using ADS-B In (PDF)

For more information, please visit NextGen Equip ADS-B.

Page last modified: