What is the minimum airspeed in RVSM airspace?

• A. 150 KIAS
• B. 170 KIAS
• C. 180 KIAS
• D. 160 KIAS

Answer: (D)

In RVSM airspace, you need enough airspeed to ensure reliable altitude-keeping and stable flight control. The minimum indicated airspeed to operate safely in this environment is 160 KIAS.

Keeping at least 160 knots provides adequate dynamic pressure for the flight controls and automatic altitude-keeping systems to function properly, ensuring precise level flight within the strict RVSM altitude tolerances. If you drop below this speed, control authority and the ability of the altitude-holding system to maintain exact altitude can weaken, increasing the risk of altitude deviations in a region where vertical separation is tightly managed.

Speeds at or above 160 are fine, but the minimum standard itself is 160. Speeds well below that reduce maneuverability and margin above stall, while speeds higher than the minimum aren’t necessary for the RVSM requirement itself.