ETSO-C199 A1

• ED Decision 2020/011/R found in: CS-ETSO Amdt 17 - European Technical Standard Orders (Oct 2026)

#### ETSO-C199 A1 *ED Decision 2020/011/R* ##### Traffic Awareness Beacon System (TABS) **1 Applicability** This ETSO provides the requirements for the applicable equipment class defined by this ETSO which traffic awareness beacon systems (TABSs) that are designed and manufactured on or after the date of this ETSO must meet in order to be identified with the applicable ETSO marking. TABS devices are distinctly different from other transponders. TABS devices are intended for voluntary equipage on aircraft that are exempted from carrying a transponder or automatic dependent surveillance — broadcast (ADS-B) equipment, such as gliders, balloons and aircraft without electrical systems. TABS devices do not meet the transponder or ADS-B requirements defined in [Commission Implementing Regulation (EU) No 1207/2011](https://eur-lex.europa.eu/eli/reg_impl/2011/1207/oj) of 22 November 2011 laying down requirements for the performance and the interoperability of surveillance for the single European sky. TABS equipment built to the minimum requirements of this ETSO will enable an aircraft to be visible to other aircraft equipped with: — a Traffic Advisory System (TAS) as defined in ETSO-C147(); — a Traffic Alert and Collision Avoidance System I (TCAS I) as defined in ETSO-C118(); — a Traffic Alert and Collision Avoidance System II, (TCAS II), as defined in ETSO-C119d; — ADS-B IN capability as defined in ETSO-C154c, ETSO-C166b (), and ETSO-C195b. **2 Procedures** 2.1 General The applicable procedures are detailed in CS-ETSO, [Subpart A](#_DxCrossRefBm920220672). 2.2 Specific None. **3 Technical conditions** 3.1 Basic 3.1.1 Minimum Performance Standard TABS requirements are derived from existing transponder and ADS-B requirements. Equipment that only meets the minimum TABS requirements will provide the capability to be seen by other aircraft equipped with traffic advisory systems, but may not support its detection by ground surveillance systems that rely on full transponder functionality. A designer who builds equipment to meet this ETSO may decide to incorporate more capability than what is outlined in this ETSO, as long as it meets the applicable requirements in the referenced standards (e.g. EUROCAE ED-73E, MOPS for Secondary Surveillance Radar Mode S Transponders, as amended by [Appendix 1 to ETSO-C112e](#_DxCrossRefBm920220811)). TABS functionality is divided into four categories: the transponder function, the altitude source function, the ADS-B OUT function, and the position source function. A Class A TABS: — includes the transponder, altitude source, and ADS-B OUT functionality; refer to subparagraphs (a), (b), and (c) below; — consists of a Class A device, or an ETSO-C112e and an ETSO-C166b-compliant device. A Class B TABS: — includes the Global Navigation Satellite System (GNSS) position source functionality; refer to subparagraph (d) below; — consists of a Class B device, or an ETSO-C129a (cancelled), ETSO-C145c or later revision, ETSO-C146c or later revision, or an ETSO‑C196b-compliant GPS. A TABS may include an ADS-B IN function, but it is not required. If it is implemented, the ADS-B IN function shall meet the performance specified in ETSO-C195b as well as ETSO-C154c, or ETSO‑C166b, or all three. A TABS is intended to make the aircraft a valid TIS-B and ADS-R client. (a) The transponder functionality must meet a subset of the requirements in document RTCA document DO-181E, MOPS for Air Traffic Control Radar Beacon System/Mode Select (ATCRBS/Mode S) Airborne Equipment, dated 17 March 2011, Section 2, for a Level 2, Class 2 transponder as amended by [Appendix 1](#_DxCrossRefBm920220940). (b) The altitude source functionality must meet the requirements of ETSO-C88a or later revision, Automatic Pressure Altitude Reporting Code Generating Equipment, dated 5 August 2016. (c) The ADS-B OUT function must meet a subset of the requirements found in document EUROCAE ED-102A, Minimum Operational Performance Standards for 1090 MHz Extended Squitter Automatic Dependent Surveillance — Broadcast (ADS-B) and Traffic Information Services —Broadcast (TIS-B), dated December 2009, including Corrigendum-1, Section 2, dated January 2012, Class B0 as amended by Appendix 1. The system must be built such that it transmits Navigation Integrity Code (NIC), Navigation Accuracy Category for Position (NACp), Navigation Accuracy Category for Velocity (NACv), Geometric Vertical Accuracy (GVA), and Safety Integrity Level (SIL) values that are appropriate for the GNSS receiver used. (d) The position source function must use a GNSS receiver that meets the requirements defined in Appendix 1. The intent of this ETSO is to allow the use of commercially available GNSS position sources. The receiver must be capable of using SBAS-provided corrections and health messages, as defined in Appendix 1, in order to provide a means to prevent the TABS from transmitting false or misleading information. The receiver may continue to provide position when outside of SBAS coverage or when using unmonitored satellites. TABS Class B position sources may not be used for certified navigation equipment. 3.1.2 Environmental Standard See CS-ETSO, Subpart A, paragraph 2.1. For Class A equipment, demonstrate the required performance under the test conditions specified in RTCA document DO-181E Section 2.3 and EUROCAE ED-102A, including Corrigendum-1, Section 2.3, dated January 2012. For Class B equipment, demonstrate the required performance under the test conditions specified in [Appendix 3](#_DxCrossRefBm920220939). 3.1.3 Software See CS-ETSO, Subpart A, paragraph 2.2. This requirement applies to Class A equipment only. Class B equipment is exempt from the software qualification defined in this paragraph. 3.1.4 Airborne Electronic Hardware See CS-ETSO, Subpart A, paragraph 2.3. This requirement applies to Class A equipment only. Class B equipment is exempt from the electronic hardware qualification defined in this paragraph. 3.2 Specific 3.2.1 Failure Condition Classification See CS-ETSO, Subpart A, paragraph 2.4. A failure of the function defined in paragraph 3.1.1 of this ETSO that results in misleading information is a minor failure condition. A failure of the function defined in paragraph 3.1.1 of this ETSO that results in a loss of function is a minor failure condition. Class B equipment is intended to be met by commercially available GNSSs and is unlikely to be designed specifically to support a minor hazard classification. The suitability of Class B equipment suitability for supporting the function in paragraph 3.1.1 of this ETSO is established by performing the functional and environmental testing in [Appendix 2](#_DxCrossRefBm920220938) and Appendix 3 to this ETSO with no further analysis required. **4 Marking** 4.1 General See CS-ETSO, Subpart A, paragraph 1.2. 4.2 Specific None. **5 Availability of Referenced Documents** See CS-ETSO, Subpart A, paragraph 3. EUROCONTROL Documents: EUROCONTROL, STA/R/460/0001/1, Study to Address the Detection and Recognition of Light Aircraft in the Current and Future ATM Environment, Issue 1.0, Final Report, dated 31 March 2005. FCC Documents: Federal Communication Commission document OET Bulletin 65 Ed 97-01, Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields is available on the internet at: http://transition.fcc.gov/Bureaus/Engineering\_Technology/Documents/bulletins/oet65/oet65.pdf UK Public Health Documents Public Health England document HPA-RPD-031, Exposure to EMFs from Lightweight Aviation Transponders, dated September 2007, ISBN 978-0-85951-605-1, can be obtained on line by going to: http://www.hpa.org.uk/Publications/Radiation/HPARPDSeriesReports/HpaRpd031/ Global Positioning System Signals, Measurements, and Performance, Ganga-Jamuna Press, by Pratap Misra and Per Enge. ISBN: 0-9709544-0-9 [Amdt ETSO/13] [Amdt ETSO/16]