RVSM was implemented to reduce the vertical separation above flight level ( FL ) 290 from 2000-ft minimum to 1000-ft minimum. A theoretical doubling of the airspace capacity, between FL290 and FL410; and. From Wikipedia, the free encyclopedia. RVSM reduces the vertical separation of aircraft from 2,000 feet to 1,000. What is RVSM? Reduced Vertical Separation Minimum (RVSM) is defined as the reduction of vertical space between aircraft from 2,000 to 1,000 feet at flight levels. Reduced Vertical Separation Minimum (RVSM) Airspace.