A statistical analysis of multiyear laboratory test results and dynamic tests chosen type of artillery fuses is presented in this article as the aim to testify influence of natural ageing process on quality indicators during long - time exploitation. The influence of exploitation time on taking shooting test decisions relating the quality of lots after conducted laboratory tests and on different inconsistencies classes which stepped out during these tests were analysed. The analysis of exploitation time influence on diagnostic decisions taking after conducted shooting tests and on occurrence inconsistences in the establish classes were also presented. The conducted statistical analysis suggested assumption, that there is possibility of changing of estimate module in the test’s methodology applied until now. The modification of this estimate module will not influence negatively on the quality of further diagnostic tests conducted, and it will not influence negatively on correct evaluation of prediction process tested elements of ammunition which the artillery fuses are. Performed the statistical analysis can be essentially relevant to modify tests methodology of the artillery fuses.