Final answer:
The repair of personnel parachute canopies typically requires a stitch overlap of at least 1 inch beyond the original seam to ensure the repair's strength and safety.
Step-by-step explanation:
When repairing personnel parachute canopies, it is crucial to ensure the integrity and safety of the parachute. The amount of stitch overlap required can vary based on specific guidelines and materials used; however, a commonly accepted practice is to overlap stitches by at least 1 inch (2.54 cm) beyond the original seam to ensure the strength and durability of the repair. This guideline ensures that the new stitching is integrated securely with the existing seam and that no weak points are left in the fabric.