What facilities and equipment are required for a certificated parachute rigger to pack the main parachute of a dual parachute pack used by him/her?

The reasoning behind selecting "none" as the correct answer emphasizes that a certificated parachute rigger does not require specific facilities or equipment solely for packing the main parachute of a dual parachute pack. While various facilities and tools may enhance the packing process, such as airing and drying facilities or specialized packing tools, they are not mandatory for the act of packing itself.

A parachute rigger can effectively pack a parachute in a range of environments without the need for specifically designated facilities. The essential qualification of being a certificated parachute rigger implies that the individual possesses the necessary skills and training to perform the task successfully under various conditions. The focus is on the rigger's qualifications rather than reliant equipment or facilities. Thus, the choice "none" aligns with the understanding that the rigging process can be accomplished without specific requirements imposed by equipment or facilities.