It is evident from the data that there are certain similarities i.e. the figures which represent gradual wear out after long life are within 1%-5%. This is contrasted by the use of CBM figures which fall within 90% - 35%. This firstly questions validity of the data supplied by the respondents; in addition it is unclear if the same or similar equipment is used with the respondent countries. In the UK, 60% of the respondents stated that they suffer from infant mortality with useful life and rapid wear out. This high figure seems to be unique to the UK. This raises the question of the type and efficiency of current maintenance practices. The figures for Belgium indicate that they suffer from inefficient maintenance practices across the range of categories. This, as with the UK suggests they employ a range of ineffective maintenance practices, or the data collected is inaccurate and not be validated. If we return table 1, it is interesting to note that 11% of the USA aerospace industry claim CBM is needed. In an industry which is highly regulated and components are made to exact