What MIDS control limitations exist INCONUS?

• A. IPF LOW or IPF OVRD are prohibited while operating in FAA controlled airspace.
• B. IPF MED is prohibited in FAA controlled airspace.
• C. IPF HIGH is prohibited in FAA controlled airspace.
• D. All IPF settings are unrestricted in FAA controlled airspace.

Answer: (A)

In CONUS, operating MIDS in FAA controlled airspace requires keeping the IPF (Interference Protection Filter) at a protective level and not using lower protection or an override. Lowering IPF reduces the protection against interference, which can degrade link reliability in a busy civilian environment. The OVRD option bypasses the normal protective filtering altogether, creating potential for unpredictable emissions or interference with other systems. To ensure safe, reliable coexistence with civilian aviation, those two settings are prohibited, while maintaining IPF MED or IPF HIGH is acceptable because it preserves protection without overriding safeguards. The idea that IPF settings are unrestricted is not correct in FAA controlled airspace.