If the number of satellites required to maintain RAIM is not available during IFR, what is the next step?

When it comes to the requirement for Receiver Autonomous Integrity Monitoring (RAIM) in IFR conditions, it's essential to ensure that the necessary number of satellites are available to provide accurate navigation data. If the required number of satellites for RAIM is not available, maintaining safety and compliance with regulations becomes paramount.

Choosing to continue the flight using other certificated navigation systems is a suitable and practical option. Other systems such as VOR (VHF Omnidirectional Range) or NDB (Non-Directional Beacon) can be relied upon to ensure the aircraft can navigate safely and effectively, even if GPS data lacks the necessary integrity assurances. This approach allows the flight to proceed safely while adhering to aviation regulations and operational guidelines.

In this situation, the flight crew would actively use alternative navigation means, ensuring they maintain situational awareness and compliance with air traffic control requirements throughout the flight. Utilizing certificated navigation systems serves to enhance safety by relying on methods that have established redundancies and reliability.