At what altitudes does RVSM airspace begin and end?

RVSM, or Reduced Vertical Separation Minimum, airspace is defined by specific altitude limits established to allow a reduced vertical separation between aircraft. It is implemented in order to enhance the efficiency of air traffic control and to increase airspace capacity.

The correct altitude limits for RVSM airspace are between Flight Level 290 (FL290) and Flight Level 410 (FL410), which is precisely what the answer states. This range allows for a vertical separation of 1,000 feet between aircraft operating at these altitudes, as opposed to the standard 2,000 feet that is typically required outside of RVSM airspace.

In contrast, the other options do not align with the defined RVSM parameters. For example, FL250 to FL350 and FL300 to FL400 include altitudes that do not fully encompass the entire specified RVSM range, while FL280 to FL380 starts below the acceptable threshold and does not extend high enough, thus failing to meet the RVSM requirements established by aviation authorities. These altitudes are significant for ensuring safe and efficient aircraft operations in crowded airspaces.