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Old 14th June 2011 | 10:39
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Noiseboy
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Joined: Jul 2005
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From: UK
For EC it denotes civil (1) or military (7) max weight rounded up and then single engine (0) or multi (5)

so EC120 is civil, between 1000 - 2000kg AUW and single engine.

EC145 civil 3-4k kg and multi engine

the EC225 is 1-civil, up to 12 ton And multi engine, so becomes 225 etc.
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