Instrument Rating Exam · Practice

If a NOTAMed satellite outage reduces visible satellites to 4 at the planned approach time, which GNSS RAIM function is still possible (with baro-aiding)?

• A.Neither function is possible — a minimum of 5 satellites is required even with baro-aiding
• B.Full WAAS/SBAS differential corrections remain fully available at the approach time
• C.Both fault detection and fault exclusion remain available with the four satellites
• D.RAIM fault detection (with baro-aiding providing the fifth constraint) — but not fault exclusion