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Airspace change proposals vary greatly in terms of size and complexity. For example, a minor change to the boundaries of high-altitude airspace over the sea will be significantly different to a major reorganisation of flightpaths at lower altitudes or over a built-up area near airports.
The airspace change process must therefore be sufficiently scalable to accommodate different types of proposal: not all airspace change proposals necessarily need to be subjected to every element of the process. Proposals are therefore assigned a Level depending on the characteristics of the change, to which the requirements of the process are applied proportionately. This scaling applies only to permanent changes to notified airspace design.
The table below describes each Level. Detailed information on each Level and the way in which requirements are scaled is available in CAP 1616 - Airspace Change.
Level 0 changes are changes to nomenclature or qualifying remarks of notified airspace design that will not alter air traffic patterns.
Change sponsors are required only to complete Stage 1A of the airspace change process.
Level 1 changes are high impact changes to notified airspace design which have the potential to alter traffic patterns below 7,000 ft over a populated area.
They are typically large-scale changes which alter aircraft tracks or dispersion, or reduce aircraft height over land below 7,000 ft over a populated area. Examples include changes to departure or arrival routes at airports and changes which have a significant impact on
other aviation stakeholders.
All heights cited are above mean sea level.
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