During which condition can one use a special flight permit?

A special flight permit, also known as a ferry permit or a hardship certificate, is issued to allow an aircraft to be flown under specific conditions that do not meet standard certification requirements for particular operations. This type of permit is typically utilized when an aircraft requires maintenance or repair, permitting it to be flown to a location where those services can be performed.

When an aircraft is being maintained or repaired, it may not meet all the regulatory criteria for standard operations. However, under a special flight permit, the flight can proceed under specified limitations designed to ensure the safety of the operation, acknowledging that there are adverse conditions in place that prevent normal flying status.

Other circumstances, while they include some level of operational requirement, don't align with the purpose of a special flight permit. Regular passenger transport, retirement flight demonstrations, and training purposes usually necessitate full compliance with safety regulations and certification standards, rather than exemptions that would allow for operation outside of those standards.