ICAO Document 8168 Volume III provides a standardized global framework for aircraft operating procedures, bridging the gap between procedure design and cockpit execution during departure, en-route, and arrival phases. It serves as essential guidance for flight operations by establishing SOPs for altimeter settings, wake turbulence, and noise abatement to ensure safety and harmonization across international aviation. You can find more information about this, and other, ICAO publications on the official ICAO website.
Criteria and requirements for establishing the altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes. International Civil Aviation Organization Implementation and Status icao doc 8168 volume 3
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