Airspace

You must be equipped with ADS-B Out to fly in most controlled airspace.

If you fly in this airspace you must be equipped with ADS-B
Airspace Altitude
Class A All
Class B Generally, from surface to 10,000 feet mean sea level (MSL) including the airspace from portions of Class Bravo that extend beyond the Mode C Veil up to 10,000 feet MSL (e.g. LAX, LAS, PHX)
Class C Generally, from surface up to 4,000 feet MSL including the airspace above the horizontal boundary up to 10,000 feet MSL
Class E At and above 10,000 feet MSL over the 48 states and DC, excluding airspace at and below 2,500 feet AGL
Over the Gulf of Mexico at and above 3,000 feet MSL within 12 nautical miles of the coastline of the United States
Mode C Veil Airspace within a 30 NM radius of any airport listed in Appendix D, Section 1 of Part 91 (e.g. SEA, CLE, PHX) from the surface up to 10,000 feet MSL

Any airspace that requires the use of a Transponder, described in 14 CFR 91.215, also requires aircraft to be equipped with a Version 2 ADS-B Out system. This can be either a 1090ES ADS-B system that meets the performance requirements of Technical Standard Order TSO-C166b, or a UAT ADS-B system that meets the performance requirements of TSO-C154c. Please note: The only the systems that meet the performance requirements of TSO-C166b or TSO-154c, or later versions — often referred to as 'Version 2' — comply with 91.225.

For aircraft operating at and above FL180 (18,000 feet MSL) or to receive ADS-B services outside the United States, you must be equipped with a Mode-S transponder-based ADS-B transmitter. For aircraft operating below 18,000 feet and within the United States ADS-B rule airspace, you must be equipped with either a Mode-S transponder-based ADS-B transmitter or with UAT equipment.

graphical depiction of airspace requirements

Click image to view larger

ADS-B Airspace and Coverage Map

Download the Equip ADS-B Google Earth map (KMZ) to look at the location of ADS-B rule airspace at your home base and where you fly. Pan and zoom to different locations and turn on the various capabilities the map includes:

  • 3-dimensional depictions of rule airspace and airports
  • Overlays of ADS-B surveillance coverage — airspace where ATC can see aircraft transmitting ADS-B Out information at altitudes of 500', 1,500', 3,000', 5,000' and 10,000' AGL

Need help? Watch the Google Earth Demo video and take a look at the instructions (PDF) for how to download and view the Equip ADS-B Google Earth map.

Do you need to equip?

Take a look at our decision flowchart.

Do you use a temporary unique call sign?

Call sign and ADS-B transmitter must match. Learn more

Nobody likes a mismatch. Flight plan call sign must match ADS-B transmitted call sign. Make checking your call sign ID part of your preflight checklist.

Last updated: Tuesday, January 17, 2023