Reduced Vertical Separation Minima
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Reduced Vertical Separation Minima or Minimum (RVSM) is an aviation term used to describe the reduction of the standard vertical separation required between aircraft flying at levels between [[flight level | FL290 (29,000 ft.) and FL410 (41,000 ft.) from 2,000 feet to 1,000 feet (or between 8,900 metres and 12,500 metres from 600 metres to 300 metres in China). This therefore increases number of aircraft that can safely fly in a particular volume of airspace. The North Atlantic System Groups that implemented RVSM first determined that they were only implementing a change to one minimum from 2,000' to 1,000'; therefore, that minimum being singular the correct terminology is minimum not minima.
Historically, standard vertical separation was 1,000 feet from the surface to FL290, 2,000 feet from FL290 to FL410 and 4,000 feet above this. This was because the accuracy of the pressure altimeter used in aircraft to determine level decreases with height. However over time Air data computers (ADC) combined with altimeters have become more accurate and autopilots more adept at maintaining a set level, therefore it became apparent that for many modern aircraft, the 2,000 foot separation was too cautious. It was therefore proposed by ICAO that this be reduced to 1,000 feet.
Between 1997 and 2005 RVSM was implemented in all of Europe, North Africa, Southeast Asia and North America, South America, and over the North Atlantic, South Atlantic, and Pacific Oceans. The North Atlantic implemented initially in March 1997 at flight levels 330 through 370. The entire western hemisphere implemented RVSM FL290-FL410 on January 20, 2005.
Only aircraft with specially certified altimeters and autopilots may fly in RVSM airspace, otherwise the aircraft must fly lower or higher than the airspace, or seek special exemption from the requirements.
Critics of the change are concerned that by reducing the space between aircraft, RVSM may increase the number of mid-air collisions and conflicts. In the ten years since RVSM was first implemented not one collision has been attributed to RVSM. In the US this program was known as the Domestic Reduced Separation Minimum (DRVSM).
[edit] External links
- Friendlier Skies - Washington Times
- FAA article promoting the new rule
- FAA chart
- RVSM on Skybrary
- Use of Trailing Cones for RVSM Certification
