When should a rigger replace parachute lines?

A rigger should replace parachute lines when they show signs of wear or damage because the primary concern is safety and reliability in the operation of the parachute. Over time and with use, parachute lines can degrade due to factors such as exposure to UV light, abrasion, and general wear. Signs of wear can include fraying, fading, or any structural changes that compromise the integrity of the lines. By monitoring the condition and replacing them as needed, a rigger ensures that the parachute will function correctly and safely during a jump.

Recognizing when to replace parachute lines is crucial, as waiting for a line to break or adopting a rigid schedule based on time alone can lead to unsafe conditions. Relying solely on the age of the lines or a specific number of jumps does not account for the variability in environmental factors and usage conditions that can affect the lifespan of the equipment.