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an overview of ADS-B environment and system descriptions;
e) Need to use the ICAO defined format for entry of the Aircraft Identification or Aircraft
Registration marking as applicable to the flight;
Note 1: ICAO Document 8168-OPS/611 Volume I (Procedures for Air Navigation
Services) requires that flight crew of aircraft equipped with Mode “S” having an aircraft
identification feature should set the aircraft identification into the transponder. This
setting is required to correspond to the aircraft identification that has been specified at
Item 7 of the ICAO flight plan and consists of no more than seven characters. If the
aircraft identification consists of less than seven characters, no zeros, dashes or spaces
should be added. If no flight plan has been filed, the setting needs to be the same as the
aircraft’s registration, again, up to a maximum of seven characters.
Note 2: The shortened format commonly used by airlines (a format used by
International Airlines Transport Association (IATA)) is not compatible with ICAO
provisions for the flight planning and ATC services used by ATC ground systems.
f) Operational procedures regarding the transmission of solely the generic emergency
flag in cases when the flight crew actually selected a discrete emergency code (if
implemented, refer to section 8.8) and SPI;
g) Indication of ADS-B transmit capability within the ICAO flight plan but only when the
aircraft is certified according to this AMC;
h) Handling of data source errors (e.g. discrepancies between navigation data sources)
(refer to 10.2.3);
i) Incident reporting procedures;
j) Crew Resources Management and associated human factors issues.
10.4 Incident reporting
Significant incidents associated with ATC surveillance information transmitted by the
ADS-B data link that affects or could affect the safe operation of the aircraft will need to
be reported in accordance with EU-OPS 1.420 (or national regulations, as applicable).
10.5 Minimum Equipment List
The MEL will need to be revised to indicate the possibility of despatch of aircraft with the
ADS-B system unserviceable or partially unserviceable.
11 MAINTENANCE
11.1 Maintenance tests should include a periodic verification check of aircraft derived
data including the ICAO 24 bit aircraft address using suitable ramp test equipment. The
check of the 24 bit aircraft address should be made also in the event of a change of state
of registration of the aircraft.
11.2 Maintenance tests should check the correct functioning of system fault detectors
(if any).
11.3 Maintenance tests at ADS-B transmit system level for encoding altitude sensors
with Gillham’s code output should be based on the transition points defined in EUROCAE
ED-26, Table 13.
11.4 Periodicity for the check of the ADS-B transmitter should be established.
12(21)
AMC 20-24 Effective: 02/05/2008
Annex II to ED Decision 2008/004/R of 25/04/2008
12 AVAILABILITY OF DOCUMENTS
EASA documents are available from http://www.easa.europa.eu.
JAA documents are available from the JAA publisher Information Handling Services
(IHS). Information on prices, where and how to order is available on both the JAA web
site www.jaa.nl and the IHS web site www.avdataworks.com.
ICAO documents may be purchased from Document Sales Unit, International Civil
Aviation Organisation, 999 University Street, Montreal, Quebec, Canada H3C 5H7, (Fax:
1 514 954 6769, e-mail: sales_unit@icao.org) or through national agencies.
EUROCAE documents may be purchased from EUROCAE, 102 rue Etienne Dolet, 92240
MALAKOFF, France, (Fax: 33 1 46556265). Web site: www.eurocae.org.
RTCA documents may be purchased from RTCA, Incorporated, 1828 L Street, Northwest,
Suite 820, Washington, D.C. 20036-4001 U.S.A. Web site: www.rtca.org.
EUROCONTROL documents may be requested from EUROCONTROL, Documentation
Centre, GS4, Rue de la Fusee, 96, B-1130 Brussels, Belgium; (Fax: 32 2 729 9109 or
web site www.eurocontrol.int).
FAA documents may be obtained from Department of Transportation, Subsequent
Distribution Office SVC-121.23, Ardmore East Business Centre, 3341 Q 75
th
Avenue,
Landover, MD 20785, USA.
Australia CASA documents are available from http://www.casa.gov.au/.
13(21)
AMC 20-24
Appendix 1
Appendix 1.1: Common Terms
Reference should be made to EUROCAE document ED-126 for the definitions of terms.
Appendix 1.2: Abbreviations
ADS-B Automatic Dependent Surveillance- Broadcast
ADS-B-NRA Enhanced ATS in Non-Radar Areas using ADS-B Surveillance
AFM Aircraft Flight Manual
ANC Air Navigation Commission (ICAO)
ATSP Air Traffic Service Provider
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