What is the purpose of the hard-rubber and hardwood plugs in the aircraft tool kit?

The purpose of hard-rubber and hardwood plugs in the aircraft tool kit is primarily to stop fuel tank leaks. These plugs are used effectively to seal damaged or leaking areas, preventing fuel from escaping and ensuring the safety and integrity of the aircraft’s fuel system. By using these plugs, maintenance personnel can temporarily address leaks until more permanent repairs can be made, which is critical in aviation where fuel management is vital for safe operations.

The other options pertain to different maintenance tasks or functions that do not directly correlate with the primary purpose of these specific plugs. While they may be components of broader maintenance practices, they do not involve using hard-rubber and hardwood plugs specifically for stopping fuel leaks.