Avro 146-RJ100, G-JEAV and others, and Embraer 145
AAIB Bulletin 4/2006, published in April 2006, documented numerous occurrences of flight control restrictions experienced during the winter of 2004/2005 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. The bulletin described the contributory factors involved and made safety recommendations, addressed to the Joint Aviation Authorities (JAA) and European Aviation Safety Agency (EASA). In the winter of 2005/2006, many more events of control restrictions were reported to the AAIB, by UK operators of Avro 146/RJ and Embraer 145 aircraft types. These events are presented in this report, which re-states the safety recommendations made in AAIB Bulletin 4/2006. 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.