The coverage of each HMU has a radius of 45 NM.
These systems are fully automatic and designed to operate 24 hours a day, 365 days of the year, however, the operator is advised to confirm the serviceability of the HMUs before conducting a dedicated height monitoring flight. Please see the latest HMU status above.
Any aircraft transmitting an ICAO 24-bit aircraft identifier, flying between FL 290 and FL 410 within the operational coverage area of the HMUs will be detected by the HMU systems.
To ensure the accuracy of the result, it is necessary for the aircraft to fly straight and level for a minimum of five minutes within the coverage area defined above.
In accordance with AIP ENR 1.3-1, as published by the German Authorities, aircraft operators are required to submit a Prior Permission Required (PPR) at least three (3) hours in advance if they intend to fly an aircraft over the Nattenheim HMU specifically for RVSM monitoring purposes.
Similarly, it is advised to contact the Geneva ACC at least three (3) hours in advance if they intend to fly an aircraft over the Geneva HMU specifically for RVSM monitoring purposes.
Advance notifications will help ATC ensure the aircraft can be operated in straight and level flight in the busy and complex nature of the airspace over the HMUs and thereby contribute to an accurate height monitoring measurement.
Please use the contact telephone numbers for the Maastricht, Geneva and Nattenheim (Karlsruhe) UAC Supervisors for details of how to submit a PPR.
Providing the flight produced a successful height monitoring result, confirmation will be available, via the section below, approximately 4 weeks after the flight.
For operators registered or approved within the EUR RVSM region or States accredited to the North Atlantic RVSM Region Central Monitoring Agency, a confirmation will be posted here, only if a valid RVSM approval is listed in the EUR RMA approvals database for the aircraft/operator.
Results for aircraft registered in States accredited to the EUR RMA will be published below.
Results for aircraft registered elsewhere will be published via the RMA for the aircrafts State of registration.