If an instrument is inoperable and it's required by 14 CFR 91.205, what can the pilot do?

When an instrument required by 14 CFR 91.205 is inoperable, a pilot is permitted to operate the aircraft by obtaining a special flight permit. This type of permit allows the pilot to legally fly the helicopter when it does not meet certain airworthiness requirements, provided specific conditions are met to ensure safety.

The special flight permit often requires that flight be conducted under certain limitations to mitigate safety risks. For example, it may limit the flight's purpose, specific route, or aircraft operation under certain weather conditions. This regulatory pathway is essential because flying without functional required instruments could endanger the safety of the flight and violate federal regulations.

The other options present limitations that do not align with regulations or sound operational practices. For instance, flying only at night does not address the underlying issue and is not a legal remedy for operating an aircraft with inoperable required equipment. Switching to a different helicopter does not inherently resolve the issue with the original aircraft's compliance with regulatory requirements. Attempting to fly without rectifying the instrument’s inoperability ignores safety protocols and regulations put in place to ensure safe flight operations. Thus, pursuing a special flight permit is the appropriate and legally compliant action.