What is the Separation Minima Solution About?

The “Separation minima” Solution proposes transitioning to a 500 ft minimum vertical separation within RVSM airspace, enabled by geometric altimetry. Unlike barometric altimetry, geometric altimetry maintains high accuracy far above the altitudes that are relevant for conventional aviation, allowing the extension of RVSM airspace up to FL 600. The project will focus on the safety aspects, including the collision and wake turbulence risks, using the European RVSM region as a test case.

Standardisation / Regulation aspects

The implementation of the reduction in minimum vertical separation would need a change of the Rules of the Air at ICAO level, specifically an amendment of the PANS-ATM (Doc 4444). However, during further maturation of the concept, the whole RVSM implementation process and requirements would need to be reworked. This will most probably also include an advancement of the MOPS and MASPS for GNSS receivers, an activity that is beyond this Solution and not specific to it.

Benefits

This enhanced separation will significantly boost airspace capacity, allowing more aircraft to fly at their optimal flight levels, reducing CO₂ emissions, and minimising detours to avoid climate-sensitive areas. It supports both civil and military aviation and facilitates the integration of advanced aircraft, such as Unmanned Aerial Systems (UAS) and High-Altitude Operations (HAO) aircraft, enhancing overall air traffic management efficiency and environmental sustainability.