--- title: "Appendix 1 to AMC1 SERA.6005(c) Requirements for communications, SSR transponder and electronic conspicuity in U-space airspace — ANNEX: Rules of the Air, SERA · Avioverse" description: "ADS-L MESSAGE GENERATION FUNCTION (a) This AMC details the minimum set of parameters that should be transmitted, and a set of parameters that may be…" url: "https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-6/appendix-1-to-amc1-sera-6005-c" --- # Appendix 1 to AMC1 SERA.6005(c) Requirements for communications, SSR transponder and electronic conspicuity in U-space airspace ANNEX: Rules of the Air · Regulation (EU) No 923/2012 · EAR revision 26 Aug 2025 Appendix Appendix ## Appendix 1 to AMC1 SERA.6005(c) Requirements for communications, SSR transponder and electronic conspicuity in U-space airspace ADS-L MESSAGE GENERATION FUNCTION (a) This AMC details the minimum set of parameters that should be transmitted, and a set of parameters that may be optionally transmitted. (b) All parameters should originate from a position source or from the system configuration. Each ADS-L message should include an identifier unique to the transmission source. \[Figure or form omitted from this preview — available in the Avioverse workspace library.] Figure 1: The scope of the ADS-L message generation function (dashed line) as specified in Appendix 1 to AMC1 to SERA.6005(c) TRANSMITTED PARAMETERS | Data type | Parameter | Required/optional | Remarks | Source | | ------------------------------------------------------------------------- | -------------------------------------------------------------------- | ----------------- | -------------------------------------------------------------------------------------------- | ----------------------- | | [Aircraft address](https://avioverse.aero/glossary/easa/aircraft-address) | Unique identifier / address | Required | Should be included in each transmission | Configuration | | | Address type | Required | See the table below | Configuration | | Time | Timestamp | Required | | Position source | | [Aircraft](https://avioverse.aero/glossary/easa/aircraft) identification | Aircraft category | Required | See the table below | Configuration | | Emergency status | Emergency status | Optional | See the table below | Pilot-in-command inputs | | Position | Latitude | Required | Reference WGS-84 | Position source | | | Longitude | Required | Reference WGS-84 | Position source | | | GNSS [altitude](https://avioverse.aero/glossary/easa/altitude) | Required | Reference WGS-84 [Height](https://avioverse.aero/glossary/easa/height) Above Ellipsoid (HAE) | Position source | | Velocity/[track](https://avioverse.aero/glossary/easa/track) | Ground speed | Required | Alternatively, north-south, east-west velocities | Position source | | | Ground track | Required | | Position source | | | Vertical rate | Required | | Position source | | | Velocity [accuracy](https://avioverse.aero/glossary/easa/accuracy) | Optional | See the table below | Position source | | Capabilities and status | Version | Required | To facilitate interoperability | Configuration | | | Design assurance | Optional | See the table below | Configuration | | | Horizontal position accuracy | Required | 95 % confidence See table below | Position source | | | Vertical position accuracy | Required | 95 % confidence See the table below | Position source | | | Navigation integrity | Optional | Containment radius (Rc) See table below | Position source | | | Source integrity [level](https://avioverse.aero/glossary/easa/level) | Optional | Probability that Rc is exceeded See the table below | Configuration | TABLES FOR REQUIRED PARAMETERS | Data type | Values | | ------------ | ----------------- | | Address type | Reserved | | | ICAO | | | Unique identifier | | | Reserved | | Parameter | Values | | ----------------- | ------------------------------------------------------------------- | | Aircraft category | No emitter category information available | | | Light fixed-wing (<7 031 kg / 15 500 lb) | | | Small to heavy fixed-wing (≥7 031 kg / 15 500 lb) | | | Light [rotorcraft](https://avioverse.aero/glossary/easa/rotorcraft) | | | Heavy rotorcraft | | | Glider/[sailplane](https://avioverse.aero/glossary/easa/sailplane) | | | Lighter-than-air | | | Ultralight | | | Hang-glider | | | Paraglider | | | Parachutist/skydiver/wingsuit | | | eVTOL/UAM | | | UAS ‘open’ category | | | UAS ‘specific’ category | | | UAS ‘certified’ category | | | Model plane | | | Reserved | | Parameter | 95 % horizontal accuracy bound | | --------- | ------------------------------ | | | EPU ≥ 926 m (0.5 NM) | | | EPU < 926 m (0.5 NM) | | | EPU < 555.6 m (0.3 NM) | | | EPU < 185.2 m (0.1 NM) | | | EPU < 92.6 m (0.05 NM) | | | EPU < 30 m | | | EPU < 10 m | | | EPU < 3 m | | Data type | 95 % geometric altitude accuracy | | -------------------------- | -------------------------------- | | Vertical position accuracy | Unknown or > 150 m | | | ≤ 150 m | | | ≤ 45 m | | | ≤ 15 m | TABLES FOR OPTIONAL PARAMETERS | Parameter | Values | | ---------------- | --------------------------- | | Emergency status | No emergency | | | General emergency | | | Lifeguard/medical emergency | | | Minimum fuel (Energy) | | | No communications | | | Unlawful interference | | | Downed aircraft | | | Reserved | | Parameter | Horizontal Figure of Merit for rate (HFOMr) values | | ----------------- | -------------------------------------------------- | | Velocity accuracy | Unknown or ≥ 10 m/s | | | < 10 m/s | | | < 3 m/s | | | < 1 m/s | | Parameter | Software and hardware DAL | | ---------------- | ------------------------- | | Design assurance | n/a | | | D | | | C | | | B | | Parameter | Rc | | -------------------- | -------- | | Navigation integrity | ≥ 20 NM | | | < 20 NM | | | < 8 NM | | | < 4 NM | | | < 2 NM | | | < 1 NM | | | < 0.6 NM | | | < 0.2 NM | | | < 0.1 NM | | | < 75 m | | | < 25 m | | | < 7.5 m | | Parameter | Probability of exceeding Rc | | ---------------------- | --------------------------- | | Source integrity level | Unknown or > 1E-3 / FH | | | ≤ 1E-3 / FH | | | ≤ 1E-5 / FH | | | ≤ 1E-7 / FH | TRANSMISSION RATE The position and velocity/track parameters should be transmitted at a rate of at least 1 Hz. The transmission of other parameters may be less frequent than 1 Hz, but not less frequent than 0.1 Hz. ERROR CONTROL There should be at least a digital error detection technique at one level of the transmission (e.g. cyclic redundancy check (CRC)). No specific error-control means are prescribed. SECURITY The transmission should be protected to ensure security and confidentiality of the exchanged parameters. POSITION SOURCE The horizontal and vertical position and velocity/track parameters should primarily be based on a GNSS source. APPENDIX · Appendix 1 to AMC1 SERA.6005(c) — Regulation (EU) No 923/2012 · ED Decision 2022/024/R · SERA Easy Access Rules · EAR revision 26 Aug 2025 [All rules in SECTION 6 Airspace classification](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-6) Consolidated from the EASA Easy Access Rules (revision 26 Aug 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.