a maintenance organization can found their training center for own staffs to meet the practical skill requirements of this AC, or choose a training organization approved by CCAR-147. if a maintenance organization training center want to train maintenance personnel other than their own. it should also get an approval by CCAR-147. in addition , practical skill is one of the qualifications of obtaining work qualification. and work qualification is a prerequisite of application for civil aviation maintenance personnel license . so the practical skill training must be done before getting maintenance personnel license