When can a GPS instrument approach be flown using RAIM?

A GPS instrument approach can be flown using RAIM (Receiver Autonomous Integrity Monitoring) when RAIM is available. RAIM is a critical feature that ensures the integrity of the GPS signals being received, allowing the pilot to trust that the position data being used for navigation is accurate and reliable.

In situations where RAIM is not available, the aircraft's ability to determine its position accurately may be compromised, which could lead to navigation errors. Therefore, it is essential for pilots to confirm the availability of RAIM prior to conducting a GPS approach to ensure that they are operating under safe and reliable conditions.

Options that suggest flying anytime or only in controlled airspace do not accurately reflect the need for RAIM availability. Furthermore, indicating that RAIM is not required misrepresents the importance of this integrity monitoring in maintaining safe navigation practices during GPS instrument approaches.