This page provides detailed legal and technical information and links about the two
comprehensive ADS-B mandates within U.S. and EU airspaces that will be effective from 2020.
Only ADS-B MOPS (Minimum Operational Performance Standard) Version 2 transponders with
all required data sets correctly transmitted will be compliant with these mandates.
MOPS version 0 or 1 transponders may send certain data subsets as aircraft position and
position accuracy, but these will not be accepted as compliant equipment by the authorities.
However, third party non aviation certified data providers may opt to use these data, of
course, if the accuracy provided is sufficient for their needs.
Other mandates will apply or are in force in less comprehensive airspaces of Canada, Singapore, Hongkong, Australia, North Sea (helicopter operations), and others. These may have other MOPS requirements.
Besides ADS-B transponder mandates there continue to co-exist Mode-S and/or Mode A/C transponder mandates in most regions of the world.
Also a detailed list of mandated and monitored ADS-B broadcast items can be found here. In general those items are monitored by adsb24.com that can be derived from routine messages of ADS-B transponders.
Data items that are transmitted in extraordinary situations only (Ident feature, TCAS RA,
etc.) are not monitored. The same applies for items that would require verification by
another system (position, altitude, velocity, etc.) or a reliable database (category,
length, width). Once a reliable aircraft database is available some items may be monitored
While we try to keep up with the evolving legal base and many regulatory documents dealing with ADS-B we cannot accept any liability for the correctness and completeness of data presented on this page.
Please report dead links to legal documents with the Contact Form.
|Legal mandate||United States||European Union||Remarks|
|Legislation||14 CFR §91.225> and §91.227||CIR 1207/2011, amended by CIR 2017/386|
|Technical Standard||FAA TSO-C166b||ICAO DOC 9871|
|Equipment Performance Requirements and Test Procedures||RTCA DO-260B (with Corr.1)||EUROCAE ED-102A (with Corr.1)|
|Guidance for the installation and airworthiness approval||FAA AC 20-165B||EASA 2013/031/R and EASA CS-ACNS|
|Acceptable means of compliance||EASA 2008/004/R and AMC 20-24||AMC 20/24 is not current and does not reflect ED-102A|
|Other regulations||EUROCAE ED-161||This document determines the EU requirements for minimum navigational accuracy.|
|Effectivity||January 01, 2020||June 07, 2020|
|Aircraft||All||Aircraft with a maximum certified take-off mass exceeding 5,700 kg (12,500 lbs)
or having a maximum cruising true airspeed (TAS) capability greater than 250 knots
|Airspace||Inside and above certain Class B, C, E airspace. Please read 14 CFR §91.225 for details.||All|
|Item||United States||European Union||Compliance monitored by adsb24.com||Remarks||Transmitted by|
|Position (WGS84)||Position accuracy cannot be verified by adsb24.com at this stage.|
|Geometric Altitude (HAE)|
|TCAS installed||This flag is not provided by ADS-B Version 2, but "TCAS operative" only. However, it may be unlawful to operate without TCAS for certain aircraft categories or within certain airspaces.|
|TCAS Resolution Advisory|
|SSR code 3/A||For EU code A1000 must not be transmitted. Surpression of this code is monitored by adsb24.com.|
|Flight plan ID (Callsign)|
|Emitter category||Must not be A0 or B0. Correlation with aircraft type will be monitored at a later stage.|
|ICAO address (24 bit)|
|Emergency status||Status transmission monitored by adsb24.com.|
|Special Purpose Indicator (Ident)|
|ADS-B in capability (1090ES and UAT)||Capability flags monitored by adsb24.com. Equipage is not mandated.|
|GPS antenna position offset||Transmitted on the ground only. adsb24.com monitors data set validity.|
|Length/width of aircraft/vehicle||Transmitted on the ground only. adsb24.com monitors data set validity.|
|Selected Altitude||adsb24.com monitors data set validity.|
|Barometric Pressure Setting||adsb24.com monitors data set validity.|
|Geometric Vertical Accuracy (GVA)|
|ADS-B Minimum Operational Performance Standard (MOPS)||MUST BE 2. Not transmitted for MOPS 0.|
|Antenna diversity configuration|
|Navigational Integrity Category (NIC)/Radius of Containment (RC)||<0.2 NM (equals NIC>=7)||NIC>=5 | RC<= 1 NM(1) or NIC>=6 | RC<= 0.6 NM(2)||(1)For airspaces with 5 NM minimum separation. (2)For airspaces with 3 NM minimum separation.|
|Navigational Accuracy Category for Position (NACp)||0.05 NM (equals NACp>=8)||NACp>=7 | <=0.1 NM|
|Navigational Accuracy Category for Velocity (NACv)||<10 m/s (equals NACv>=1)||NACv>=1 | <=10 m/s|
|System Design Assurance (SDA)||2 (equals <1 x 10-5)||2 (equals <1 x 10-5)|
|System Integrity Level (SIL)||3 (equals <1 x 10-7)||3 (equals <1 x 10-7)|
U.S. mandate by FAA
EU mandate by EASA
Monitored by adsb24.com
Subject to fee
Available from ADS-B MOPS Version 0 transmissions
Available from ADS-B MOPS Version 1 transmissions
Available from ADS-B MOPS Version 2 transmissions
Available from Mode-S ELS replies
Available from Mode-S EHS replies