Per the article, the definitions are following a 1994 crash in which icing conditions lead to the accumulation of ice aft of the de-icing boots - a location that does not normally see icing and in which the pilots had no recourse to correct the issue.
My understanding is that the FAA added a new category, "Heavy" to their icing definitions terms, while also adding identifyable, quantifiable, critera to their existing icing definitions.
The new definition was shelved after a meeting with many of the major players in aviation policy making - citing coordination issues with various publications, advisory circulars, and automated systems. I expect we'll see these definitions come back after a coordinated effort is undertaken...so standby.
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