Before revision: The following factors may need to be considered: number of tests symmetry of the test structure and the applied loading installation and certification of repairs scatter factors material and manufacturing process variability environment criticality
After revision: Airworthy standards typically require that an aircraft remains safe even with the structure in a degraded state due to the presence of fatigue cracking.The following factors may need to be considered: number of tests symmetry of the test structure and the applied loading installation and certification of repairs scatter factors material and manufacturing process variability environment criticality