Autopilot Coupling NA?
See the KSTS ILS Runway 32 approach. It states that autopilot coupled approaches are NA below 1038 feet. DA is 380 feet. Why the prohibition on autopilot use?
Readback September 2023
Key Takeaways:
- Some ILS approaches restrict autopilot coupling below certain altitudes because autopilots process raw, undamped navigation signals, which can fluctuate due to environmental factors, leading to aggressive and potentially unsafe control inputs.
- Night prohibitions for circling approaches typically indicate unlit obstacles, often terrain, penetrating the obstacle evaluation slope. Additionally, approaches named without a specific runway (e.g., RNAV-B) only provide circling minimums, often due to steep descent gradients or runway misalignment.
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