What is the minimum set of parameters that should be transmitted in an ADS-L message according to AMC1 SERA.6005(c)?

The minimum set of parameters includes: aircraft address (unique identifier and address type), time (timestamp), aircraft identification (aircraft category), position (latitude, longitude, GNSS altitude), velocity/track (ground speed, ground track, vertical rate), and capabilities and status (version, horizontal position accuracy, vertical position accuracy).

Which parameters in an ADS-L message are optional to transmit?

Optional parameters include: emergency status, velocity accuracy, design assurance, navigation integrity, and source integrity level.

What are the possible values for the 'Address type' parameter in ADS-L?

The possible values for 'Address type' are: Reserved, ICAO, and Unique identifier.

What are the possible values for the 'Aircraft category' parameter in ADS-L?

The possible values include: 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, and Reserved.

What are the possible values for the 'Emergency status' parameter in ADS-L?

The possible values are: No emergency, General emergency, Lifeguard/medical emergency, Minimum fuel (Energy), No communications, Unlawful interference, Downed aircraft, and Reserved.

What are the possible values for the 'Velocity accuracy' parameter in ADS-L?

The possible values are: Unknown or ≥ 10 m/s, < 10 m/s, < 3 m/s, and < 1 m/s.

What are the possible values for the 'Design assurance' parameter in ADS-L?

The possible values are: n/a, D, C, and B.

What are the possible values for the 'Navigation integrity' parameter in ADS-L?

The possible values are: ≥ 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, and < 7.5 m.

What are the possible values for the 'Source integrity level' parameter in ADS-L?

The possible values are: Unknown or > 1E-3 / FH, ≤ 1E-3 / FH, ≤ 1E-5 / FH, and ≤ 1E-7 / FH.

What are the possible values for the 'Horizontal position accuracy' parameter in ADS-L?

The possible values are: 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, and EPU < 3 m.

What are the possible values for the 'Vertical position accuracy' parameter in ADS-L?

The possible values are: Unknown or > 150 m, ≤ 150 m, ≤ 45 m, and ≤ 15 m.

What is the reference for the GNSS altitude in ADS-L?

The GNSS altitude should reference WGS-84 Height Above Ellipsoid (HAE).

What is the reference for latitude and longitude in ADS-L?

Latitude and longitude should reference WGS-84.

What is the purpose of the 'Version' parameter in ADS-L?

The 'Version' parameter is required to facilitate interoperability.

What is the source for the 'Emergency status' parameter in ADS-L?

The source for the 'Emergency status' parameter is pilot-in-command inputs.

Appendix 1 to AMC1 SERA.6005(c) Requirements for communications, SSR transponder and electronic conspicuity in U-space airspace

Q: What is the required transmission rate for position and velocity/track parameters in ADS-L?

The position and velocity/track parameters should be transmitted at a rate of at least 1 Hz.

Q: What position source should be primarily used for horizontal and vertical position and velocity/track parameters in ADS-L?

The horizontal and vertical position and velocity/track parameters should primarily be based on a GNSS source.

Q: What are the possible values for the 'Emergency status' parameter in ADS-L?

The possible values are: No emergency, General emergency, Lifeguard/medical emergency, Minimum fuel (Energy), No communications, Unlawful interference, Downed aircraft, and Reserved.

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Appendix 1 to AMC1 SERA.6005(c) Requirements for communications, SSR transponder and electronic conspicuity in U-space airspace

ED Decision 2022/024/R

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 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
Aircraft address	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	Alternatively, north-south, east-west velocities	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.

Details

Source-Title: Appendix 1 to AMC1 SERA.6005(c) Requirements for communications, SSR transponder and electronic conspicuity in U-space airspace View latest amendments

Erulesid: ERULES-1963177438-20351 Compare versions

Applicabilitydate: 26 January, 2023

Entryintoforcedate: 21 December, 2022

Regulatorysource: ED Decision 2022/024/R Navigate

Parentir: SERA.6005 Requirements for communications, SSR transponder and electronic conspicuity in U-space airspace

Origin: EASA

Category: EAR