Each planned maintenance tasks must be justified with reference back to a FMECA, FTA, regulatory or other reason.- the precise reference in the study document, for example a reliability analysis, a safety analysis, a study of dependability, the studies of FMECA.- Test results: provide specifications and test reports, eg endurance tests.- REX: provide complete REX file.- The precise reference of regulation.- Other raison (Repositories, Specific Requirements...)These reasons must be identified in the BLESS/UNILIFE/LSA Database (Maintenance Plan section) as covered in 2.7.2."