Dimensions

Mass production has been a basis of the approach to the most economic methods of manufacturing. And the complete replacement of a defective item is common practice in the maintenance of aircraft and aerospace components. For this reason, limits are imposed on the manufacturing processes, to ensure that if any two mating parts are manufactured to the dimensions as stated on the relevant drawings, then the parts will assemble without major adjustments and in the least time possible.

The limits are based on the allowances and tolerances imposed on the dimensions of the manufactured parts. These dimensions will be given the accuracy required by the designer of the respective parts.