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AAIB re-states recommendations on flight control restriction events in winter operations
12 July 2006

The UK AAIB again reported several occurrences of flight control restrictions experienced on aircraft with non-powered flying controls. These events were believed to have been caused by the freezing of the rehydrated residues of thickened de/anti-icing fluids, that had accumulated in the aerodynamically ‘quiet’ areas of the elevator and aileron controls. Numerous occurrences were already published in April 2006 by the AAIB. The AAIB has repeatedly expressed its concerns to the UK CAA, the JAA and EASA, that effective measures to address the airworthiness concerns posed by the residues of thickened de/anti-icing fluid have yet to be implemented an re-states the safety recommendations made in April. (AAIB)