What is Top of descent?
In this glossary, Top of descent refers to: The calculated point during cruise at which an aircraft initiates descent from cruising altitude toward destination, usually determined by onboard flight management systems.
How is Top of descent used in aviation?
In aviation communication, this term appears in contexts such as: "Pilot: We have reached top of descent, commencing descent to flight level one eight zero as cleared."
Why does Top of descent matter in aviation?
Top of descent matters because it supports clear communication in Flight Phase contexts for Pilots, Air Traffic Controllers, and Cabin Crew. It also connects to aviation training and exam language such as ICAO Level 4, ICAO Level 5, ICAO Level 6, and EASA FCL.055.
Who uses Top of descent?
Top of descent is mainly used by Pilots, Air Traffic Controllers, and Cabin Crew.
What category does Top of descent belong to?
In this glossary, Top of descent is grouped under Flight Phase. Related pages in this category explain adjacent procedures, commands and operational concepts.
Where does this definition come from?
This definition is sourced from ICAO Doc 9432, FAA PCG and published by Protermify Aviation as a static aviation reference page.
