What is a requirement for a parachute rigger to exercise the privileges of their certificate?

To exercise the privileges of their certificate, a parachute rigger must demonstrate their abilities to the FAA Administrator. This requirement ensures that the rigger meets the necessary standards of proficiency and knowledge concerning parachute packing and rigging techniques, which are crucial for safety in aviation operations. By requiring this demonstration, the FAA aims to uphold safety regulations and maintain the integrity of the rigging profession, ensuring that riggers are not only certified but also competent in their skills at the time they are required to perform their tasks.

The other options represent activities or timeframes that, while they may be beneficial to the rigger, do not fulfill the regulatory requirements set forth for maintaining the validity of their certificate. It's not enough to have performed duties within a certain time or to have packed a specific number of parachutes without demonstrating those skills to an appropriate authority. Therefore, the focus on a formal demonstration of ability ensures adherence to safety and operational standards in the field.