Next time you fly an RNP approach down to 200 feet, or execute a go-around that feels uncomfortably close to terrain, remember Volume III. It is the legal and technical proof that somewhere, on a rainy Tuesday, a test pilot in a specially equipped jet proved that it could be done .
One of the most practical takeaways from Volume III is the section on . If an ILS localizer is slightly misaligned but still "legal," Volume III tells the inspector whether to release it to the public or shut it down. Knowing these tolerances (e.g., the difference between a "Category I" and "Special Authorization" alignment) helps you understand why an approach might be NOTAMed as "unmonitored." icao doc 8168 volume 3
