This paper presents a brief review of the UK CAA's research and action over recent years in response to experience of accidents and incidents in the nineteen eighties. Three general areas are identified, namely icing atmosphere, ice detection, and pneumatic boot de-icing systems. The recent initiatives instigated under the FAA Icing Plan and the ARAC Harmonisation process have highlighted some of these areas which are now subject to comprehensive review with respect to developing revised and/or new airworthiness requirements. The UK CAA strongly supports this activity whih has the potential for significant improvements in certification and operational standards. However, the tasks identified for this work will require fundamental examination of the implications of moving from the existing objective requirements to those of a more prescriptive nature, including their effect on certification of different aircraft types and the means of demonstrating compliance.
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