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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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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 and the Air Navigation Services of the Czech Republic 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) and EUROCONTROL’s Maastricht Upper Area Control Centre and Mode S ELS ‘city-pair’ flights between Frankfurt, Munich, Amsterdam and Dusseldorf continue apace.
Further information regarding individual State’s ELS and EHS implementation plans can be found here:
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[13/04/2010] Lastest EASA Airworthiness Directive involving Mode S Transponders |
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EASA AD 2009-0097, which is superseded by this AD, presented measures to be taken to prevent loss of detection of aircraft by SSR stations that do not process Mode A/C signals (i.e. Mode S only), caused by an anomaly in the Rockwell-Collins TDR94/94D Mode S Transponder. Further analysis revealed that the problem was caused by an error in the air/ground override logic of the transponders. This condition, if not corrected, could lead to further incidents of loss of aeroplane detection by SSR stations that do not process Mode A/C signals.
For the reasons described above, this new AD retains the requirements of AD 2009-0097, but also extends the applicability to include the affected transponders when installed on helicopters. |
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[17/03/2010] Changes to the Airspace Structure in the Eastern Part of the Amsterdam FIR. |
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See Netherlands AIC A 04/10 and revised AIC A 07/08 for details (click on the link below). |
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[01/01/2010] Closure of EUROCONTROL ECC |
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With effect from 01/01/2010, the EUROCONTROL Mode S ECC is closed and new procedures for requesting exemptions from the carriage and operation of Mode S airborne equipment are now in force. |
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