Final answer:
RVSM airspace refers to airspace between FL290 and FL410 where aircraft are separated by 1,000 feet vertically. RVSM stands for Reduced Vertical Separation Minimum, aimed at increasing airspace efficiency.
Step-by-step explanation:
RVSM airspace is any airspace or route between FL290 and FL410 inclusive where aircraft are separated vertically by 1,000 feet. RVSM stands for Reduced Vertical Separation Minimum and it is a set of regulations that allows aircraft to fly at levels with only 1,000 feet of vertical separation between them, rather than the traditional 2,000 feet used at these flight levels. This shift in separation standards enhances airspace capacity and efficiency, and it requires aircraft to have specific equipment and pilot training to operate within these parameters. It's important for pilots and air traffic controllers to fully understand RVSM policies to maintain safe and efficient aircraft operations.