1. Standardized maintenance: Some maintenance work has already been verified and validated through standardized procedures, and therefore does not require additional revalidation. For example, in the maintenance of some mechanical equipment, pre-defined and recognized maintenance procedures and methods are used.
2. Replaceable parts: If original or pre-validated replaceable parts are used in the repair process, no quality re-qualification is required. For example, if an original spare part is replaced in a vehicle repair, it can be considered reliable and no additional quality re-qualification is required.
3. Experienced service engineers: In some cases, experienced service engineers can rely on their own specialized knowledge and experience to assess the repair work without the need for additional quality re-qualification. This is because they have accumulated a lot of practical experience and can accurately judge the quality of the repair work.
However, it is important to note that in the vast majority of cases, quality revalidation is important, especially for areas such as aircraft and medical equipment where personal safety is at stake. If there are no special circumstances, we should always include quality revalidation as part of our maintenance work.