What happens if proper RAIM sensitivity is not available?

If proper RAIM (Receiver Autonomous Integrity Monitoring) sensitivity is not available, one implication is that manually resetting sensitivity to 0.3 NM will not automatically change the RAIM sensitivity on certain receivers. This means that if a pilot attempts to adjust the sensitivity settings to match operational requirements, the system may not respond as expected, leading to potential integrity issues with GPS navigation.

This scenario stresses the importance of understanding how the specific equipment operates and what can happen if manual adjustments are implemented without assurance of system compliance. In environments where RAIM is crucial for safe operations, failing to recognize or adapt to these limitations can compromise safety and navigational accuracy.

The other options suggest alternative outcomes, such as assuming RAIM can always adjust automatically, or that the flight would need to revert to VFR (Visual Flight Rules) operations, which may not necessarily reflect the nuances of how RAIM functions under different conditions. Thus, understanding the limitations of equipment settings is critical in maintaining safe aviation practices.