AppendixAppendix
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 | 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 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 | Required | Reference WGS-84 Height Above Ellipsoid (HAE) | Position source | |
| Velocity/track | Ground speed | Required | Alternatively, north-south, east-west velocities | Position source |
| Ground track | Required | Position source | ||
| Vertical rate | Required | Position source | ||
| Velocity 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 | 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 | |
| Heavy rotorcraft | |
| Glider/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