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Mode S and ACAS Programme |
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Welcome to the Secondary Surveillance Radar Mode Select (SSR MODE S) and Airborne Collision Avoidance System (ACAS) Programme website.
***PLEASE NOTE: Both the Mode S and ACAS Programmes have been concluded. Mode S Elementary Surveillance elements will, however, be managed through the Aircraft Identification Programme (see below). Every effort will be made to keep the information on this website current, but visitors must always check the validity of any third party documents made available here.***
Please follow the links below to access your selected element of the programme:
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ACID Newsletter
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10/11/2010: For the latest news concerning the Aircraft Identification Programme, Edition 1 of the ACID Newsletter is available here.
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European States have introduced Mode S Elementary Surveillance (ELS) services and it is now essential that flight crews and aircraft operations staff accurately complete flight plans and operate Mode S transponders in the approved manner.
The following (updated) leaflet details simple steps that must be followed precisely:
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Mode S Enhanced Surveillance (EHS)
National Air Traffic Services (NATS) UK, EUROCONTROL’s Maastricht Upper Area Control Centre, Air Navigation Services of the Czech Republic and Hungarocontrol (from 29/07/2010) have each successfully implemented Mode S EHS and operations are ongoing.
Later this year, it is expected that Germany’s Deutsche Flusicherung (DFS) will implement Mode S EHS, initially within the lower airspace.
Mode S Elementary Surveillance (ELS)
Mode S ELS has successfully been implemented by Germany’s DFS, Air Traffic Control the Netherlands (LVNL), EUROCONTROL’s Maastricht Upper Area Control Centre and France's DSNA. Mode S ELS eligible ‘city-pair’ flights between Frankfurt, Munich, Dusseldorf, Amsterdam, Paris (CdG) and Basel continue apace.
For more detailed information concerning the implementation of Mode S in Europe, click on the following link:
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[11/01/2012] European Commission publishes mandate for ACAS II |
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Commission Regulation (EU) No 1332/2011, published on 16th December 2011, lays down common airspace usage requirements and operating procedures for airborne collision avoidance. For new aircraft this becomes effective from 1 March 2012, for ‘retro-fit’ the requirement is applicable from 1 December 2015. |
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[27/10/2011] Updated Mode S Transponder Capability List |
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This updated list, compiled by the Airborne Monitoring Project, provides only an indication of Mode S transponder capability. Aircraft Operators/Owners are advised to contact their supplier to verify this information. |
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[23/09/2011] UK - New AIC (AIC P 068/2011) |
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This AIC explains the rationale behind the transition to a Mode S radar infrastructure within UK airspace, the reasons why some Mode S transponders fail to respond to Mode S interrogations, and the potential consequences of such failure. This AIC also highlights, for the attention of aircraft operators, a number of pertinent EASA Airworthines Directives and manufacturer's Service Bulletins
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[14/09/2011] Netherlands - New AIC (AIC A 06/11) |
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The purpose of this AIC is to inform general aviation pilots (including glider and balloon pilots) of the importance of the correct use of the Mode S transponder and how to select the correct setting of the transponder, specifically in relation to being visible to ATC safety nets and airborne collision avoidance systems (ACAS). This AIC is effective from 06/10/2011 and replaces AIC A 01/10. |
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[August 2011] ***IMPORTANT INFORMATION FOR AIRCRAFT OPERATORS*** |
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EUROCONTROL has issued a Safety Warning Message (SWM) concerning the flight safety implications of incorrect or missing data being transmitted by faulty Mode S transponders. This SWM refers mainly to four Safety Information Bulletins (SIB) recently published by EASA, but also includes references to a number of associated EASA Airworthiness Directives (AD). |
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