When must a parachute made of synthetic fibers be packaged to be considered airworthy?

To determine the airworthiness of a parachute made from synthetic fibers, it's important to know that these parachutes must be packed and repacked within a specified time frame established by regulatory guidelines. For parachutes constructed with synthetic materials, they must be repacked every 180 days to ensure that they maintain their reliability and performance.

This repacking schedule is crucial because synthetic fibers can degrade over time when exposed to environmental factors such as moisture, sunlight, and fluctuating temperatures, which can affect the parachute's effectiveness during deployment. By adhering to the 180-day repacking rule, pilots and operators ensure that the equipment is in optimal condition for use in emergency situations.

Other options present shorter or longer repacking intervals that do not align with the accepted standards for synthetic fiber parachutes. Thus, the 180-day period is critical for ensuring safety and compliance with aviation regulations regarding parachute airworthiness.