Fixing extraction method and part therefor

摘要

A method of extracting a fixing 14 from an aircraft structure 10 includes use of a protective cushion, for example in the form of a washer 22. At least a part of the fixing 14 is retained within a hole in the structure 10. A percussive tool 24 is used to strike the fixing to push the fixing 14 along the hole. The protective cushion (washer 22) is placed around the hole to protect against impact by the percussive tool 24. A laminar material may provide the protective cushion. Such material may be formed of multiple layers, comprising a layer (figure.8, 130) of composite material formed of woven fibre material, a metallic layer (132) and an elastomeric layer (134). There may be a fourth outer layer of adhesive material (136). There is also a method for making said protective cushion.