5.39.6.1 Apply Blocks to Fleet Activity Diagram 5.39.2.1 Define Block Frequency Activity Diagram 5.34 Maintenance Requirement Management 5.39.3.1 Define Block Applicability Activity Diagram 5.39.5.1 Approve Block Activity Diagram 5.39.1.1 Create New Block Activity Diagram 5.39.1.2 Revise Existing Block Activity Diagram 5.39.4.1 Package Requirements Into Blocks Activity Diagram