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What are the Mode S (EHS) mandates?

April 26, 2017mandates mode

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What are the Mode S (EHS) mandates?

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The requirements of Mode S EHS apply to IFR flights as GAT by fixed wing aircraft in the designated airspace notified (currently) by Germany, France and the United Kingdom when the aircraft has a maximum take-off mass greater than 5,700 kg or a maximum cruising true airspeed in excess of 250 kt. The mandates take effect for civil registered aircraft from 31 March 2005 in Germany and the United Kingdom, and with effect from 31 March 2007 in France for aircraft considered to be EHS capable. Transition arrangements permit operators to retrofit aircraft until 31 March 2007 upon application to the Mode S Exemption Coordination Cell (ECC) and, exceptionally until 31 March 2009, for up to 10% of an EHS capable fleet when operators provide proof of being faced with disproportionate installation costs. This latter exceptional exemption also permits a delay in compliance with Mode S ELS until 31 March 2009.