Following high-profile wake incidents involving the A380 and new-generation aircraft (like the B787), the separation minima have been recalibrated. The 17th edition introduces more granular categorization ("Super," "Upper Heavy," "Lower Heavy," etc.). If you work a busy final approach, these new numbers are mandatory memorization.
If you need the most current regulations, you are likely looking for Doc 4444, 16th Edition (or the 15th Edition incorporating Amendments 7 and 8). This guide focuses on the structure and core content that remains consistent across editions, while highlighting recent major changes. icao doc 4444 17th edition pdf
The Appendices at the back of the PDF are arguably the most used sections for working controllers. Following high-profile wake incidents involving the A380 and