Which of the following statements is not true regarding SVFR clearances to fixed-wing aircraft?

The statement indicating that a SVFR flight plan must be filed is not true. Special Visual Flight Rules (SVFR) allow pilots to operate in weather conditions below the established VFR minima under certain conditions, but they do not require a formal flight plan to be filed. Instead, pilots must make specific requests for SVFR clearances, which gives them the ability to operate in controlled airspace during periods of reduced visibility.

Other details about SVFR operations provide context. SVFR clearances are available at certain airports, but they are not universally accessible at all airports, especially in those that may not have the infrastructure or service to accommodate SVFR operations. Additionally, SVFR operations can occur in Class E airspace, provided that pilots adhere to the necessary regulations and obtain clearances. Lastly, it is essential for pilots to request these clearances rather than having them automatically granted, ensuring the safety and coordination of air traffic in congested areas.