The term CDCCL - Critical Design Configuration Control Limitations - actually refers to design characteristics that have to be retained during maintenance or modification. This means that disturbing systems related to, adjacent to or having a potential impact on fuel systems identified as being at risk (as identified during the accomplishment of the stipulations of SFAR 88 and related JAR or EASA documents) may be subject to special inspections identified as CDCCL tasks in ICA and in AMPs. The term Fuel Tank Safety (FTS) is more accurate with regard to training considerations and comes in two phases.