How many fasteners must be installed on applicable stress panels prior to towing?

The requirement to install two out of every three fasteners on applicable stress panels prior to towing helps ensure the structural integrity of the aircraft during the towing process. This specification is established to maintain an adequate level of support and load distribution throughout the panels, reducing the risk of potential damage or failure caused by insufficient fastening. The selected option is correct because it strikes a balance between operational efficiency and safety, ensuring that the panels are adequately secured without requiring all fasteners to be installed, which might be unnecessary in some contexts. It highlights the importance of maintaining a robust standard for safety while recognizing practical considerations during towing operations.